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  • automation  (101)
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  • FISON  (109)
  • University of Florida, Florida Cooperative Fish and Wildlife Research Unit  (11)
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  • 1
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    Case studies on HIV/AIDS in fisheries development: lessons for Nigerian fisheries (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23230 | 19325 | 2018-03-18 15:00:41 | 23230 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: This paper reviews accounts of social and economic features of HIV/AIDS epidemics in the fisheries sector focussing on Africa with particular reference to Nigeria. Fishing communities are often among the highest-risk group, with high overall rates of HIV/ AIDS prevalence. It is more important to use the information made available from these efforts in more effective way of targeting the appropriate interventions and measures that can be designed and instituted. This information could also serve useful purposes and the efficient mobilization of needed resources from all possible sources in order to achieve the Millennium Development Goals in the Fisheries sector in Nigeria.
    Description: Includes:- 31 refs.
    Keywords: Conservation ; Health ; Nigeria ; HIV/AIDS ; freshwater environment ; Public health ; Human diseases
    Repository Name: AquaDocs
    Type: conference_item , TRUE
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    Format: 113-119
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  • 2
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    Aquaponics: a new trend in food production (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24175 | 19325 | 2018-05-13 18:58:18 | 24175 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The increase in population coupled with current and escalating extent of soil degradation, water scarcity and climate-related challenges plaguing agricultural productivity in every corner of the world and particularly in Nigeria demands for alternative food techniques, one of them called aquaponics. This paper highlights a new trend in food production techniques for the production of fish and vegetable crops in aquaponics. Aquaponics is experiencing renewed interest worldwide with many small home growers and large operations employing the process as a means of producing sustainable fish and plant crops. The design of this scalable farming system closely mirrors that of recirculating systems in general, with the addition of a hydroponic component and the possible elimination of a separate biofilter and devices for removing fine and dissolved solids. The benefits of aquaponics includes conservation of water resources and plant nutrients, intensive production of fish and reduced operating costs relative to either system in isolation. Aquaponics, without doubt is a practice that is receiving considerable interest due to an ever increasing need for fresh wholesome food and sustainable eco-friendly agricultural practices.
    Description: Includes: 3 figures.;Also includes: 12 references.
    Keywords: Aquaculture ; Nigeria ; Ibadan ; Aquaculture ; Hydroponics ; Recirculating system ; Sustainable ecosystem ; Natural fertilizer ; Aquaponics ; freshwater environment ; Plant culture ; Sustainable development ; Environmental impact ; Food security ; Aquaculture development ; Organic fertilizers ; Recirculating systems ; Agropisciculture ; Water resources ; Conservation ; Aquaculture techniques ; Fish culture
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    Format: 98-101
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  • 3
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    Technology for the culture of marine fish species: prospects and implementation in Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24598 | 19325 | 2018-05-21 12:11:03 | 24598 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Greater proportion of the much needed rich animal protein and other essential nutrients for man's prolonged well-being, globally, is derived from fish. Three considered factors in production model for such aquaculture project include: the technology, suitable site for location of envisaged set up and market. While concerned and interested stakeholders can bring together the intelligentsia for such venture, the government can provide enabling environment, Noting that the adopted technology will consist of hardware (equipment and structures) and software (relevant human resource and globally accepted procedures), technology for the production of marine fish species can be assembled in Nigeria since there are engineers of various disciplines, fisheries researchers, fish farmers, hatchery operators, technologists, technicians, numerous marine and brackish water shell and finfishes and several kilometres of coastal area. There are industries that can fabricate various aspects of the facilities and equipment knowing fully well that corrosion free and non-toxic materials are a must for fish breeding operations. The challenge for regular power supply can be overcome by turning to alternative energy sources such as solar energy, or from sources such as gas, wind, or water, these being abundant in Nigeria. The first step in efforts to establish technology for the culture of marine fish in Nigeria and boost production in the face of dwindling production from the wild should be a review of literature and spirited efforts to adapt such for the nation. This paper focuses on success made so far in the culture of marine fish species in some parts of the world, and necessary steps to ensure their establishment in Nigeria.
    Description: Includes: 21 references.
    Keywords: Aquaculture ; Nigeria ; Marine fish culture and technology ; Prospect ; marine environment ; automation
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    Format: 127-130
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  • 4
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    Identification, distribution and prevalence of ecto-parasites associated with cultured fish in Ogun State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24597 | 19325 | 2018-05-21 12:09:36 | 24597 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Public health issues can he considered as those of direct importance to both producers and consumers of fish and include broader issues of food production, processing and delivery systems. As aquaculture assumes an expanding role in meeting consumer demands for fish and fishery products, it is natural that they meet safety and quality standards. Aquaculture is a growing industry in Nigeria and it has assumed commercial importance activity. This study was part of the project on epizootiological survey of pathogenic diseases of cultured fish species and is aimed at identifying ecto-parasite associated with cultured fish in Ogun State, Nigeria. The study which was carried out in 2012 covered fifty fish farm, spread across the three senatorial zones. Five pieces of fish were randomly picked from each farm surveyed. Participants observation and structured questionnaires were administered to fish farmers in order to gather information on source of fries, fish feeding and feed type, use of manure and its type, pond type, stocking density, pond hygiene, water source, frequency of changing water and history of diseases and mortalities of fish. Before the fish samples were collected, pond size and physicochemical water quality were assessed. Water test kits were used to measure parameters like iron, nitrate, alkalinity and ammonia. All the procedures for physicochemical water quality parameter analysis was done according to the manufacturer's instructions. Water pH was measured using a probe while dissolved oxygen and both water as well as air temperature were measured by using Hanna kit. All types of farms are included in the survey such as hatcheries, brood stock farms as well as grow out farms. The study revealed the spread of parasites across the senatorial zones. The most common encountered parasites were Trichodina sp, Gyrodactylus sp, Dactylogyrus sp and trematodes. The intensity of the parasites differed markedly.
    Description: Includes: 21 references.
    Keywords: Aquaculture ; Nigeria ; Distribution ; Prevalence ; Cultured fish ; Epizootiological survey ; Ecto-parasites. ; freshwater environment ; automation
    Repository Name: AquaDocs
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    Format: 123-126
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  • 5
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    Status of fish farming in Rivers State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24593 | 19325 | 2018-05-20 16:09:32 | 24593 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The study surveyed the status of fish farming in Rivers State of Nigeria. Structured interview schedule questionnaires were used in sourcing information from 90 fish farmers randomly selected from nine local government area, with three local government each drawn from each agricultural zone of the state. Data obtained were analyzed using descriptive statistics. The findings revealed that majority (34.4%) of the fish farmers were male and between the age range of 41-50 years. 31.1% of fish farmers cultured their fish in concrete fish tanks. The total mean annual production of fishes were 41,000 metric tons, 38.9% of fish farmers practiced integrated fish farming, 72.2% of the farmers practice only fish production; 58.9% of farmers sourced their information from friends/fellow farmers. In terms of water supply, 40.0% of farmers sourced their water supply from borehole, 36.6% use tilapia species as their fingerlings, 38.9% of farmers sourced their fingerlings from government hatchery 15.2% of farmers indicated that they suffer loss of tilapia, 54.4% farmers use partial harvest, 92.6% of farmers indicated irregular electricity supply as a major constraints to fish production. In order to facilitate the efficient operation of fish farming in the study area, technical advice on pond construction and preparation, species selection and supply for stocking purposes and collection of relevant data on aquaculture will help in the improvement of fish farming in the study area.
    Description: Includes: 17 references.
    Keywords: Aquaculture ; Nigeria ; Rivers state ; Aquaculture ; Fish ; Rivers State ; freshwater environment ; automation
    Repository Name: AquaDocs
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    Format: 109-113
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  • 6
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    Gender and age blood parameters references in African catfish (Clarias gariepinus) cultured in earthen ponds during dry season in Ibadan metropolis, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24580 | 19325 | 2018-05-20 06:01:18 | 24580 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Blood analysis is important in fish health investigation and may be influenced by intrinsic and extrinsic factors. However difficulties exist in the use of blood analysis in the investigation of fish health due to the paucity of species specific, gender and age based reliable references. The current study therefore aims to determine some blood parameters in order to provide reliable references for dry season of the normal condition values of C. gariepinus, a widely cultured fish in Nigeria. This study involved random sampling of 900 C. gariepinus aged 4, 5 and 6 months from earthen pond for three years. Data obtained for blood parameters using standard method were analyzed using descriptive statistic, students'-test, one-way ANOVA level of significant set at p ~,0.05. Results showed the female had significantly (p ~,0.001) higher values than the males for each age bracket and the values increased sig nificantly (p 0~,.05) with increased in PCV. hemoglobin, RBC, WBC, total protein, potassium, sodium, Creatinine, ALT, AST and glucose. The females and males values at 4, 5 and 6 months old were PCV (32.14 ~c 0.19% vs 26.72 ~c 1.l2; 36.45 ~c 1.39% vs 32.33 ~c 1.46%; 40.83 ~c 0. 73% vs 35.01 ~c 0.08%.), total protein (3.98 ~c 0.16g/l vs 3.49 ~c 0.18g/l; 4.45 ~c 0.10g/l vs 4.33 ~c 0.04g/l). Lymphocytes, neutrophils, mono cytes and ESR values showed no stable trend in gender differences with increased age. In both the females and the males, lymphocytes decreased significantly (p ~,0.05) while neutrophils and monocytes increased significantly (p~,0.05) with increased age. ESR decreased significantly (P~, 0.05) in the males and non-significantly in the females with increase in age. It is hoped that these values obtained would serve as a reliable reference to enhance an appropriate intervention in the culture of C. gariepinus aged 4. 5 and 6 months in earthen pond which may be extrapolated for use in other culture systems.
    Description: Includes: 48 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Clarias gariepinus ; Gender ; Blood parameters ; Earthen pond ; Culture ; freshwater environment ; automation
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  • 7
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    Construction and application of green house techniques for aquaculture practice in the arid zone of Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24582 | 19325 | 2018-05-20 15:54:40 | 24582 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: An experimental greenhouse was constructed at the fish pond site of the Federal College of Freshwater Fisheries Technology, Baga using the freestanding design style. Air temperature, water temperature and evaporation readings were observed for two weeks. Temperature records in the green house ranged between 25-27~'C at 6am and 26-32~'C at 6pm while atmospheric temperature was observed between 22-25~'C at 6am and 24-28~'C at 6pm respectively. Evaporation rates were observed to be higher in the water trough placed outside than the one placed inside the greenhouse. Water depth dropped from 39.5cm to 34.5cm (i.e 9cm) and 39.5cm to 30.5cm (5cm) in the trough placed outside and inside the greenhouse respectively. From this experiment, water is connserved as a result of low evaporation rate and higher water temperatures are attainable in the greenhouse which is desirable in the extremely cold harmattan season in the arid zone of Nigeria.
    Description: Includes: 10 references.
    Keywords: Atmospheric Sciences ; Aquaculture ; Nigeria ; Aquaculture ; Greenhouse technique ; Arid zone ; freshwater environment ; automation
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  • 8
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    Climate change: impacts and threats on freshwater aquaculture (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24583 | 19325 | 2018-05-20 15:55:56 | 24583 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: This paper examines the major effects of climate charge on aquaculture, especially on the freshwater ecosytem. Aquaculture as established is not practiced evenly across the world. Therefore, the paper highlights the current aquaculture practices within the regions and across the different environments to ascertain the major effects of climate variations on the freshwater ecosystem and aquaculture practices in particular. The main elements of climate change that would impact on aquaculture produ ction, such as sea level and temperature rise, changes in monsoon patterns and extreme climatic events and water stress, among others were properly looked at and the reasons for their effects addressed. The different elements of climate change that are experienced in varying degrees can be either positive or negative or directly or indirectly, depending on the different culture systems that are practiced. It is in the process of our study that we brought out the complex attributes of climate change as it affects aquaculture productivity and the possible roles that the society can play to ameliorate the harsh effects of this ugly monstet; referred to as ”climate change and the consequent global warming trends.
    Description: Includes: 17 references.
    Keywords: Atmospheric Sciences ; Aquaculture ; Nigeria ; Climate change ; Freshwater ; Aquaculture ; freshwater environment ; automation
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  • 9
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    Sealing capacity of different materials for the reclamation of cracked concrete fish tanks (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24585 | 19325 | 2018-05-20 15:58:45 | 24585 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The sealing capacity of latex sealant and Portland cement for the reclamatiOn of cracked concrete fish tanks was investigated for a period of three months. Concrete fish tanks (5m x 5m x lm) were divided into duplicate treatments (T1 and T2). The latex sealant was utilized in treatment 1 (T1) while Portland cement was utilized in treatment 2 (T2). The tanks were initially filled with water and the seepage rates were determined within five days and results showed that the rate of seepage was very high which led to the abandonment of the tanks. The surfaces of the tanks were cleaned thoroughly before the application of the sealant and cement. In Tl, the sealant was mixed in a ratio of 1:4:7 (sealant: water: cement) and applied with brush in two layers before the mortar was finally applied. The Portland cement was also mixed in a ratio of 1:3 (cement: plaster sand) and applied on the other two tanks in T2. The tanks were filled with water after curing for one week. The seepage rate determined in Tl was 4mm per day when the weather was clear (sunny) which may be as a result of water loss by evaporation while the seepage rate determined in T2 shows a continuous decrease of 12mm every 24 hours, irrespective of weather condition.
    Keywords: Aquaculture ; Nigeria ; Sealant ; Concrete tank ; Seepage ; Portland cement ; freshwater environment ; automation
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  • 10
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    Survey of functional and non-functional fish hatchery in Jigawa State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24589 | 19325 | 2018-05-20 16:04:34 | 24589 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This study was conducted in the five emirate zones of Jigawa. The number of functional and non-functional fish hatcheries were investigated in the state. The results showed that there were 35 fish hatcheries in the state, and private ownership (57.14%) dominate the government ownership (42.16% ), all with less than 1000,000 fingerlings production annually. The study also indicate that out of the 35 fish hatcheries, 15 were found to be functional in operation and 20 are found existing but not functional in operation. Based on the field survey, all the respondent are of the opinion that the level of production and number of functional hatcheries in the state are low. Recommendations were made on how to improve hatchery operation that could help to boost aquaculture development in the state.
    Description: Includes: 7 references.
    Keywords: Aquaculture ; Nigeria ; Jigawa ; Fish hatchery ; Functional ; Non-functional ; freshwater environment ; automation
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    Format: 94-96
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  • 11
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    The design and construction of a fish-tank cage: transforming cage culture in a flooding world (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24588 | 19325 | 2018-05-20 16:03:10 | 24588 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: The Fish tank cage was designed and constructed as an ingenious innovation to boost cage culture and transform aquaculture in Nigeria and beyond. It consists of two major components. The first is a black 500 litre capacity plastic water storage tank which was perforated profusely (840 meshes/m2 on the body and 256 meshes/m2 at the bottom) to fashion out a meshed tank. The circular meshes on the body have a diameter of 12mm, and that of the bottom 8mm. The dead weight of the tank with cover and lock is 12.7kg. The height above ground is 104cm and circumference at the middle is 270cm, the thickness is 0.5cm. The second component is a 6 inches diameter PVC square ring, sealed to serve as an air tight device for buoyancy. Suspension rods passed through hangers on the tank cage were used to suspend the tank cage in the middle of the suspension ring. The tank cage has the properties of a good cage-durability, easy waterflow through, non-toxic predator proof and flood resistant. It can be used as a floating or submerged cage. It can hold up to 300 adult fishes. However, the stocking capacity for intensive farming will be determined by field trials.
    Description: Includes: 6 references.
    Keywords: Aquaculture ; Nigeria ; Fish tank gate ; Cage culture ; Aquaculture ; freshwater environment ; automation
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  • 12
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    Physico-chemical parameters of fish ponds as it affects fish production in Ado-Ekiti, Ekiti State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24590 | 19325 | 2018-05-20 16:05:58 | 24590 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: The water analysis of five selected ponds in Ado-Ekiti in Ekiti State, was carried out to determine their suitability for fish culture. Pa rameters analyzed were: Temperature, Turbidity, Carbon (IV) oxide, Alkalinity, Hardness, pH and Dissolved oxygen. Values for temperature ranged between 20.0~'C and 29.0~'C, Turbidity values were between 46.0-50.2cm, Carbon (IV) oxide: 11.5-12.2mg/litre; alkalinity: 100-120mg/liter; hardness: 110-200mg/litre; pH: 6.8-7.8 and dissolved oxygen: 5.8-6.8mg/liter. The values obtained were found to be within acceptable range for fish production.
    Description: Includes: 10 references.
    Keywords: Aquaculture ; Chemistry ; Nigeria ; Physico-chemical parameter ; Fish pond ; Ado-Ekiti ; Fish production ; freshwater environment ; automation
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  • 13
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    Prevalence of parasites in the gut lumen of farmed catfish Clarias gariepinus in Lagos and Ogun States (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24595 | 19325 | 2018-05-20 16:10:53 | 24595 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: A cross-sectional study was conducted in four (4) different production systems in Lagos and Ogun States of South Western Nigeria beetween December,2012 and May 2013 to determine the effect of Culture systems and management practices on prevalence of parasites in the gut of farmed catfish (Clarias gariepinus). Information on pond type, water source, feeding practices and general pond management were also gathered through administration of fish disease sample collection from Water for the examination of physicochemical parameters, was collected from 40 fish ponds comprising earthen, concrete, water recirculatory and poorly managed systems across the two (2) States. Temperature, pH and ammonia were monitored using the recommended range by FAO as standard. Also 160 live farmed catfish, 80 from each state, 20 from five different ponds of each system with a minimum of 4 live fish per system was collected, dissected and examined under the microscope for parasite load of the gut of C. gariepinus. The earthen, concrete and water recirculatory systems had good management practices compared to the poorly managed systems. The observed water physicochemical parameters in ponds with good management were within normal range. Five groups of parasites were observed; Protozoa (Eimeria spp), Cestodes (Bothriocephalus spp., Diphyllodium spp), Monogea (Enterogyrus spp), and copepods (Argasilus spp) and Nematodes (Procamallanus spp). Analysis of variance between location and System showed level of no significance (p〈 0.05). The interaction effect of location (State) and production system on parasite load of C. gariepinus also was not significant (p〉0.05). However interaction hetween Ogun and poorly managed system has the highest number of parasites (11.5), followed by Lagos (7.0). The systems with good management practice had low number of parasites with water recirculatory system recording the least number of parasites (0.5). Analysis of association between temperature, ammonia, and pH in all the cultured systems showed a significant level of correlation (p〈0.05). In this study, poorly managed systems especially where farmed fish received water directly from rivers and streams predispose fish to parasite infection of the gut. Good water quality management and proper fish husbandry techniques will eliminate most parasitic infection and improve on fish production.
    Description: Includes: 11 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Parasite ; Water recirculatory system ; C. gariepinus ; freshwater environment ; automation
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  • 14
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    Effect of feeding frequency on growth and survival rate of Clarias gariepinus fingerlings reared in plastic bowls (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24586 | 19325 | 2018-05-20 16:00:00 | 24586 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: The effects of feeding frequency on feed intake, growth and survival rates were determined in C. gariepinus. Twenty fish per tank (bowl) were stocked in triplicate. They were fed once (1D), thrice (3D) and five times daily (5D) respectively. The 5D group growth rates were observed significantly different (P〈 0.05) from fish fed on 1 (1D) and (3D) feeding frequency. All the treatments containing 1D, 3D and 5D were observed to have significant difference (P〉 0.05) in terms of final weight (FW). There was also a noticeable increased trend in final weight (5D 〉 3D 〉 7D). Feed conversion ratio (FCR) of 3D and 5D treatments were higher than 1 D) treatment (P〈 0.05). According to the results, feeding C. gariepinus 1 time daily (1D) did not influence the growth; however, 5 times daily reduced mortality and improved the feed conversion ratio (FCR) of C. gariepinus.
    Description: Includes: 9 references〉
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Feeding frequency ; Feed convertion ratio ; Growth ; Survival rate ; freshwater environment ; automation
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  • 15
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    Synthesis of climate change effects on water sources for aquaculture (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24592 | 19325 | 2018-05-20 16:08:17 | 24592 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: The effect of climate change on the aquatic environment has been well documented with results detailing increase in green house gases and global temperature. Water quantity and quality for aquaculture is also affected by this global phenomenon. Increasing global temperatures affects many sectors in an ecosystem. Water use in aquaculture can be in-situ or ex-situ. Groundwater is expected to be recharged if climate change leads to increased rainfall and runoff but empirical evidence suggests otherwise. The sustainability of groundwater for aquaculture is therefore threatened. Increased temperatures of surface waters can affect water quality and suitability for use in aquaculture with attendant biofouling and growth of thermophilic algae. Rainwater is affected by human activities and pollution as well as materials used for its collection. It is usually low in pH and will need to be buffered. The use of water from any source as well as the use of water bodies for aquaculture must be done with regular analysis of parameters since climate change is an ongoing process.
    Description: 34 references.
    Keywords: Atmospheric Sciences ; Aquaculture ; Nigeria ; Groundwater ; Surface water ; Rain water ; Climate change ; Aquaculture ; automation
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  • 16
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    Aquaculture business management in Nigeria: issues and considerations - a review (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24587 | 19325 | 2018-05-20 16:01:42 | 24587 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: Starting an aquaculture business in Nigeria requires a good understanding of the industry. Small aquaculture ventures cannot compete effectively in the present scenario where large farms are springing up in the urban areas of Nigeria. The export market for aquaculture products has not been fully exploited. The export of smoked fish to the United Kingdom has been ongoing and expanding, but it is meant to serve the African community in the UK. The bane of the aquaculture industry lies in the small nature of most of the enterprises. Nigeria has no specific legislation on aquaculture hence the idea of a National Aquaculture Strategic Initiative is a welcome development.
    Description: Includes: 38 references.
    Keywords: Aquaculture ; Nigeria ; Aquaculture ; Socio-economic ; Legislation ; Enterprise ; freshwater environment ; automation
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    Challenges of inland artisanal fish production in Nigeria: economic perspective (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24600 | 19325 | 2018-05-21 12:14:25 | 24600 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Fishery production is significant to Nigerian economy in view of its roles in providing cheap source of food/nutrition security, income, employment, serves as source of foreign exchange, particularly those of the riparian communities. Despite these significant roles, fisheries subsector is faced with huge challenges, such as: decreasing yield, inefficient management of fishing policy, inadequate technological and commercial knowledge among others, thereby limiting its production potentials. The possibility of fish production especially artisanal fisheries to match up with fish productivity in the economy depends on fishing operation, efficient use of laboour, sustainable and efficient management of fishing policy. Therefore the essence of this study is to review the challenges in fish production in Nigeria, Economic perspective, with emphasis on the role of fisheries in economic development, decreasing fish yield, market forces and resource inefficiency.
    Description: Includes: 13 references.
    Keywords: Fisheries ; Nigeria ; Fishery ; Economic perspective ; Challenges and production ; freshwater environment ; automation
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    Efficiency of different traps for silver catfish fishery and its aquaculture implications in the face of climate change (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24601 | 19325 | 2018-05-21 12:17:22 | 24601 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Climate change has the potential to severely impact coastal and inland environments and ecosystems, and by extension fisheries and aquaculture. Coastal regions of the world are already experiencing flooding due to rise in sea level. In recent times, salinization of coastal areas due to flooding from storm surges and high tidal influence has been observed. Aquaculture is a fast growing agri-business venture in Nigeria presently and many coastal communities derive their livelihood from it. The culture of freshwater fish species that are very sensitive to high salinity may be threatened leading to mortality of stocked fish and loss of livelihood for coastal population. Consequently, there is urgent need for development and domestication of the Silver catfish, Chrysichthys nigrodigitatus that can tolerate higher salinity more than Mudcatfish (Clarias gariepinus). This will help mitigate the impact of salinization of coastal areas arising from sea water flooding on culture of fresh water fish species.
    Description: Includes: 17 references.
    Keywords: Aquaculture ; Pollution ; Fisheries ; Chrysichthys nigrodigitatus ; Clarias gariepinus ; Nigeria ; Climate change ; Silver catfish ; Chrysichthys nigrodigitatus ; freshwater environment ; automation
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    Format: 137-139
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  • 19
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    Effects of dispersed Bonny Light crude oil on two life stages of Oreochromis niloticus (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24607 | 19325 | 2018-05-21 12:29:07 | 24607 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The effects of Goldcrew, a chemical dispersant commonly used in crude oil spill incident, to alter interactions between the components of the crude and the biota in the ecosystem, were studied. We used a static renewal bioassay to study its effects on Bonny light crude using the tilapia, 0. niloticus at various concentrations for 50 days. A control experiment was also set up. The exposure concentration of the water accommodated fractions (WAF) of the mixture of the dispersant and Bonny Light crude, dispersed crude (DCOWAF-PAH) and the WAF of Bonny Light alone (COWAF-FIH) were 0.2,0.4,0.8 and 1.6m/L respectively. The mortalities of the fingerlings in different concentrations of the DCOWAF-PAH were 66.7%, 23.3%, 86.75% and 100% in the 0.2. 0.4, 0.8 and 1.6m/L exposure centrations respectively. At these concentrations, mortality was significantly different (P〈0.05) between the fingergerlings and fry, with a total mortality of 69.2% among the fingerlings, while the fry had 5.8% mortality in the 0.8 and 1.6ml/L concentrations with 13.3% 10.0% respectively but the differences were not statistically significant (p〈0.05). There was no mortality in the concentrations of COWAF- PAH. It can be said that Bonny Light was made more toxic to 0. niloticus by the presence of the dispersant; increased the susceptibility of the fingerlings to the mixture of crude and dispersant and influenced the behavior of the fish. There is therefore need to apply dispersants with caution especially around fish breeding and nursery ground.
    Description: Includes: 8 references.
    Keywords: Aquaculture ; Pollution ; Oreochromis niloticus ; Nigeria ; Goldcrew ; Crude oil ; O. niloticus ; freshwater environment ; automation
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    Effect of sublethal concentrations of formalin on the growth of Clarias gariepinus fingerlings (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24611 | 19325 | 2018-05-22 05:58:34 | 24611 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Fingerlings of Ciarias gariepinus were exposed to various sublethal concentrations (10.0, 20.0, 30.0. 40.0, 50.0 and 60.0 ~KL/L) formalin and the concentration of 0.0 ~KL/L formalin served as the control. The toxicant led to depressed weight gain in the fish. Severity of this depression was directly proportional to the toxicant concentrations. However, there was no difference (p〉0.05) in weight gain in test fish of various concentrations. Restlessness, loss of balance, erratic swimming behavior, respiratory distress, vertical movement and death, were observed in test media especially in the concentrations 60.0 and 50.0~Kl/L of formalin. Such observation were not recorded in the control tanks.
    Description: Includes: 9 references.
    Keywords: Aquaculture ; Pollution ; Clarias gariepinus ; Nigeria ; Clarias gariepinus ; Formalin ; Concentration ; freshwater environment ; automation
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    Effects of sub-lethal concentrations of glyphosate on behaviour and some biochemical parameters of African catfish (Clarias gariepinus) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24614 | 19325 | 2018-05-24 09:35:20 | 24614 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The sub-lethal effect of glyphosate on behavior and some biochemical parameters of African catfish, Clarias gariepinus were investigated using static renewal bioassays and continuous aeration for a period of 28 days using varying concentrations (100ppm, 200ppm, 300ppm, 400ppm and 500ppm). During the exposure period, the fish showed different abnormal behaviours such as restlessness, loss of balance, respiratory distress, grouping together, darting movements, loss of equilibrium, mucous secretion and erratic swimming. At the end of the experiments, the fish were sacrificed and the blood samples were collected. The gill and liver of the fish were removed from biochemical bioassay. Compared with the control, the result showed a significant increase (P〈0.05) in the activities of alanine amino transferase (ALT), and aspartate amino transferase (AST), in both the blood and the gill of exposed fish except in liver where it showed a significant reduction. However the values of lactate dehydrogenase (LDH) and superoxide dismutase (SOD), showed significant increase in the blood with a noticeable decrease in both the gill and liver of exposed fish. The study showed that sub-lethal concentratiom of glyphosate are harmful to Clarias gariepinus. This study shows that sub-lethal concentrations of glyphosate is harmful to Claria gariepinus. The implication of these results in rational exploitation and conservation of fishery resources and the public health risk consuming glyphosate-exposed to fish are highlighted.
    Description: Includes: 22 references.
    Keywords: Fisheries ; Pollution ; Clarias gariepinus ; Nigeria ; Glyphosate ; sub-lethal ; Biochemical ; Conservation ; Public health ; freshwater environment ; automation
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    Assessment of chemical and nutrient characteristics of selected wetland waters and sediments in Bo - Moyamba districts, southern Sierra Leone (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24617 | 19325 | 2018-05-22 06:09:58 | 24617 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The impact of anthropogenic activities on chemical and nutrient characteristics of selected wetlands in Moyamba and Bo districts was investigated. Water and sediments samples for nutrient and trace metal analysis were collected for two seasons (wet and dry) at sampling sites. Anthropogenic activities such as industrial effuent, domestic and agricultural waste disposal constitute major sources of wetland pollution in the selected districts. Samples of water and soil were analyzed for metals (Cr, Co, Cd, Ni, Pb, Mg, Mn, Fe, C1 and Zn) and nutrients (Ca, K, P and Na) levels were determined and their seasonal variations were compared at (p〉0.05) significant levels. Physico-chemical parameters such as Temperature, Dissolved oxygen, Ammonia, Nitrate, pH, general hardness, total alkalinity were also measured. Fe was the most concentrated metal in water (mean range 15.93 ~c 1.51 to 33.65 ~c 7.79mg/l) and in sediment (15748 ~c 3526 to 107702 ~c 84038 mg/1), while Cr and Mg were the least concentrated (0.34 ~c 0.14 to 0.53 ~c 0.09mg/l) and (0.07 ~c 0.01 to 0.22 ~c 08 mg/1) respectively. Generally, trace meta levels in sediment of the study area were relatively higher than tht concentration in water. Na was the most concentrated nutrient in both water and sediment, while calcium has the least. Calcium plays an important role in blood clotting, muscular contractions and in some enzymatic processes and as such its level in the studied wetland must be augmented. Accumulations of metals in the environmental matrices are ecologically undesirable as they pose threats to man who is the end user of the values of wetland ecosystems and consequently the need for policy intervention in the effective management of both domestic and industrial wastes.
    Description: Includes: 33 references.
    Keywords: Ecology ; Limnology ; Nigeria ; Trace metals ; Nutrient ; Physico-chemical ; Wetland ; Enthropogenic ; Policy intervention ; freshwater environment ; automation
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  • 23
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    Tilapia sex reversal using methyl testosterone (MT) and its effect on fish, man and environment (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24621 | 19325 | 2018-05-22 06:17:09 | 24621 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Tilapia is the second leading aquatic crop globally, next to carps and its production has increased tremendously within the last decade. Its production is however affected by stunting, a phenomenon brought about by overpopulation due to precocious reproduction under mixed sex culture system. Several methods such as use of predatory fish, hybridization, polyploidy and sex reversal, using methyl testosterone have been employed w1th different degrees of success. This paper reviews the use of methyl testosterone in sex reversal of tilapia and its consequent effects on fish, man and environment. It established the preference of all-male tilapia due to better and more uniform growth under culture system. It has been demonstrated that the hormone does not have any adverse effect on fish flesh after cessation of treatment of tilapia fry. In like manner; ingestion of fish produced by sex reversal does not therefore harm man. However,one is not too sure of the effect of the hormone or its by- products on vital organs (liver, kidney, pancreas and gills), metabolic profile and nucleic acids. This may also affect muscle building and perceived libido-enhancement in man. On the environment, the steroid is either biodegraded or mineralized. It must be stated that escapee from tilapia hatchery into the natural water may, however, alter the dynamics of the environment due to unforeseen consequences.
    Description: Includes: 14 references.
    Keywords: Aquaculture ; Biology ; Oreochromis niloticus ; Nigeria ; Sex reversal ; Tilapia ; Man ; Environment ; freshwater environment ; automation
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  • 24
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    Observation on the sex ratio, fecundity, egg size and gonadosomatic index of grey mullet (Mugil cephalus) from high brackish tropical lagoon (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24627 | 19325 | 2018-05-22 06:26:49 | 24627 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The 2661 specimens of the striped mullet, Mugil cephalus L. used for this study, were collected from high brackish lagoon in southwest Nigeria for 24 months. The size of the 2661 specimens of M. cephalus used for this study ranged from 1.7- 29.5cm standard length (total lenght 1.9 to 39.0cm). The sex ratio for M. cephalus was 1:0.53 and this showed a statistically significant (p〈0.05) dominance of the male over the females for the size range. The fecundity estimates varied from 635,568- 1,520,185 and was positively correlated to the fish and weight. Oocyte diameter averaged 409.64 ~c 40.67pm and this is indicative of an early stage of gonad maturation of the specimens in the lagoon before final spawning occurred. The GSI indicated that spawning activity occurred from December to May in the open ocean.
    Description: Includes: 28 references.
    Keywords: Ecology ; Fisheries ; Mugil cephalus ; ASE ; Nigeria ; Lagos Lagoon ; Mature ; Spawning ; Specimen ; Male ; Female ; brackishwater environment ; automation
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  • 25
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    Growth pattern and specificity of attachment of lagoon crab (Callinectes amnicola) fouled with barnacles (Chelonibia patula) from Lagos Lagoon, Southwest Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24635 | 19325 | 2018-05-23 07:59:06 | 24635 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The growth pattern and condition factor (K) of 810 Lagoon crabs (Callinectes amnicola) fouled with Barnacles (Chelonibia patula), collected from Makoko Jetty, off Lagos Lagoon between April-September 2011 were studied. The carapace length f C. amnicola examined ranged from 3.8cm-8.6cm while the carapare width ranged from 9.5cm-15.4cm. The total weight ranged from 53.1g to 165.0g, indicating that increase in length correspond to increase in weight, thereby suggested that C. amnicola from Lagos Lagoon exhibited a negative allometric growth. The correlated coefficient 'r' for the crabs was 0.68, showing a low correlation between carapace length weight in the lagoon crabs fouled with barnacles. The condition factor (K) values of C. amnicola fouled with barnacles ranged from 3.2-9.7 with a mean value of 5.4. The highest K-value was recorded for the size group 3.5-4.4. The value decreased with increased length of C. ammcola. The sex ratio (1:80) indicated that there were more females (98.8%) than males (1.2%), 12 (1.5%) of the 810 lagoon crabs examined were heavily fouled with barnacles distributed all over the points of attachment with the cora having the most attachment (91.6 6%). Average diameter of the barnacles attached to the crabs ranged from 0.23cm to 1.85cm. The distribution shows that large-sized crabs had much banacles attached to them than small-sized crabs, with greater barnacles found in the females than in the males.
    Description: Includes: 25 references.
    Keywords: Ecology ; Fisheries ; Callinectes amnicola ; Chelonibia patula ; Nigeria ; Lagos Lagoon ; Callinectes amnicola ; Specificity ; Lagoon ; Condition factor ; Sex ratio ; freshwater environment ; automation
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    The identity of Schilbe intermedius in Jebba Lake, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24630 | 19325 | 2018-05-22 06:31:54 | 24630 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This study attempts to ascertain the identity of Schilbe intermedius (Family: Schilbeidae) in Jebba Lake using quantitative (mophometric and meristic) and qualitative (colour and shape) parameters that makes identification easier. One hundred (100) specimens were collected and used for the study. There was relationship between body weight and length of fish (a=0.039, b=2.332, r=5.96). The parameters are similar to description of other authors. There is also absence of adipose fin found in the species, which is due to the geographical location.
    Description: Includes: 14 references.
    Keywords: Ecology ; Fisheries ; Schilbe ; intermedius ; Nigeria ; Jebba Lake ; Morphometric ; Meristic ; Butterffish ; Jebba Lake ; freshwater environment ; automation
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    Perception of fish farmers to climate change and adoption strategies in Oyo State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24667 | 19325 | 2018-05-27 15:06:16 | 24667 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The study identified the perception of fish farmers in Oyo State to climate change as well as the adaptation strategies used by them. A two stage stratified sampling method was used to select 156 fish farmers from the four Agriculture Development Programme (ADP) zones and eight local government areas (LGAs) in Oyo State. Structured questionnaires were administered to the fish farmers. Descriptive statistic and linear regression were used to analyses data collected. The result shows that majority were males (84.0%\}, dominant age (66.0%) were within the age bracket of 46-65 years. The farmers are literate as 46.8% have attained secondary education, 69.9% had above six years of experience in fish farming experience and 97.5% were engaged in culturing catfish Clarias spp. The highest portion (70.5%) earns less than N500,000 as income from fish sale. Due to effect of climate change on fish production in the study area, fish farmers reported different types of adaptation strategies. Result of the linear regression analysis indicates that there is a significant (p〈0.05) negative effect of household size and years of fish farming experience and significant (p〈0.1) positive effect of age on farmers' perception of climate change on fish production.
    Description: Includes: 7 references.
    Keywords: Aquaculture ; Pollution ; Nigeria ; Agriculture development programme ; Climate change ; Fish farmers ; freshwater environment ; automation
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    Current trends of fish processing in Jabi Lake area (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24672 | 19325 | 2018-05-23 07:47:49 | 24672 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A survey of the fish processing practices of the fishing settlement around Jabi lake area in the Federal Capital Territory (FCT) was conducted. The main purpose of constructing the reservoir is to serve as the main source of water supply to the FCT, fishing and fish processing became prominent. Fishermen are recording very low fish catch and the level of hygiene in fish handling practices is very low. The processors are majorly involved in smoking and frying which is dominated by 79% of middle aged young men whereas, 21% are women. The scale of fish processing in Jabi Lake area is still at the subsistence level. Furthermore, the processors do not package the processed fish products, rather they gather them in baskets and plastic bowls. FCT resideents usually procurelive and smoked fish from Kado fish market.
    Keywords: Fisheries ; Nigeria ; Jabi Lake ; Fish processors ; Livelihood and fish processing ; freshwater environment ; automation
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    Effects of spices on the chemical properties of hot-smoked catfish (Clarias gariepinus) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24673 | 19325 | 2018-05-24 09:33:52 | 24673 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Effect of spices on the chemical properties of hot-smoked catfish (C.gariepinus) was examined. The experimental design was complete randomized design (CRD) with the treatments been the variously spiced hot-smoked catfish (garlic, ginger, garlic-ginger homogenate spiced and the control without spices). Proximate and mineral content analyses were carried out using standard experimental procedures. There exist significant differences (p〈0.05) in the percentage moisture and crude protein content with smoked catfish without spices having the highest moisture content with mean value 6.18 ~c 0.13 and 79.44 ~c 0.13 respectively which could be as a result of the increase in the fibre content of the spiced fish products which is a function of fibre content of the spices applied to the fish products. Similar trend was also observed for the lipid and ash contents the fish products. There exist significant differences (p〈0.05) in the mineral content preseent in the various fish products with the exception of magnesium. The products are rich in calcium and other minerals with garlic-ginger homogenate spiced product having the highest level of calcium (0.980 ~c 0.02).
    Description: Includes: 25 references.
    Keywords: Fisheries ; Clarias gariepinus ; Nigeria ; Spices ; Organoleptic properties ; Chemical properties ; Hot-smoked ; C. gariepinus ; freshwater environment ; automation
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  • 30
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    Modification of NIFFR multipurpose smoking kiln with insulation (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24669 | 19325 | 2018-05-23 07:44:23 | 24669 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A study was conducted on the old NIFFR smoking kiln in order to improve on it. The parameters used to determine the smoking efficiency include the loss in weight of the fish samples, temperature and the time taken to properly smoke the fish using fire wood as smoking fuel. The smoking kiln was tested by smoking three different species of fish: Clarias gariepinus, Oreochromies niloticus, Synodontis membranecious over a period of two hours. The modified smoking kiln was discovered to perform faster. Its advantage over the already existing one is that it is faster in smoking fish to a regular golden brown colour. The temperature of the heat supplied was quite higher about 100~'C to 120~'C than the commonly used drum oven. The smoking kiln has the average oroduction cost of No.90,000.
    Description: Includes: 9 references.
    Keywords: Fisheries ; Nigeria ; Fish ; Wire mesh tray ; Mild steel ; Chimnet ; Damper plate ; freshwater environment ; automation
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  • 31
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    Impact of calcium carbonate on the juveniles of brackish river prawn, Macrobrachium marobrachion under laboratory conditions (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24674 | 19325 | 2018-05-23 07:49:22 | 24674 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The acute toxicity and the effect of sub-lethal concentrations of calcium carbonate on the morphology of M. macrobrachion were investigated under laboratory conditions. The prawns were exposed at 0, 160, 320, 640, 1280, 2560 and 5120 mg/l of CaCO3 using static renewal bioassay for 96 hours for the acute toxicity test. The prawns were also exposed for the chronic test at 0, 20.0, 40.0, and 80.0 mg/1 for a period of two weeks. Mortality occurred in the bioassay tanks at random and the bioassays were monitored throughout the exposure period. Results showed that exposed prawns were not significantly impacted when compared with the control group and correlations were significant at P〈0.05. There were no mortalities in the tanks with the highest concentrations while one death was recorded in the control tank and in the tank with the 160 and 320mg/1 of CaCO3 respectively. The gills of exposed prawns were analyzed using photomicrography and the results showed that the organs had their normal morphological status after the exposure time, implying that CaCO3 is non-toxic to M. macrobrachion. The applications of the result to prawn culture and water quality management were discussed in details.
    Description: Includes: 12 references.
    Keywords: Pollution ; Aquaculture ; Macrobrachium macrobrachion ; Nigeria ; Acute toxicity ; Sub-lethal concentration ; Static renewal bioassay ; Histology ; freshwater environment ; automation
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    Socioeconomic analysis of fish farming in Ogun State, southwest Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24666 | 19325 | 2018-05-27 15:04:08 | 24666 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Fish farming as an economic activity in Nigeria is predominantly an extensive land based system practiced at subsistence level in water. The socio-economic analysis of fish farming in Ogun State, South-Western Nigeria was carried out using data collected from sixty randomly selected fish farms. Data were analyzed using descriptive statistics, costs and returns, as well as regression analysis. The relationship between fish output and five inputs: feed, fertilizer, lime, labour and fingerlings were measured using Cobb-Dou production model. Results suggest that a unit increase in feed application contributed 68 percent increase to the profitability of the farms and this was significant at p〈0.1. Also, fertilizer was significant at p〈0.05, the results suggest that a unit increase in fertilizer application contributed 5l percent increase to the profitability of the fish farms. The model explained 79% of the variation in total output. On the whole, fish farming was found to be profitable with a benefit-cost ratio of 1.23 and the rate of return on investment is 0.19. It is recommended that fish farmers in the study area should increase their use of feed, lime and fingerlings and decrease their use of fertilizer and labour. Socio-economic characteristics of fish farmers showed that most of them were males, married and middle aged with formal education.
    Description: Includes: 33 references.
    Keywords: Aquaculture ; Sociology ; Nigeria ; Ogun State ; Economic analysis ; Aquaculture ; Fish farming ; Cobb-Douglass model ; freshwater environment ; automation
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    Aflatoxin levels in fish feeds in Abeokuta, Ogun State (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24071 | 19325 | 2018-05-12 13:53:17 | 24071 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Post harvest contamination can occur if drying of feed is delayed and when water is allowed to exceed critical values for mould to grow during storage. This study examined the aflatoxin levels in fish feeds surveyed in Abeokuta, Ogun State, Nigeria. Fifteen (15) fish farms were randomly selected for assessment of the aflatoxin levels in fish feeds in Abeokuta. After the estimation of the aflatoxin levels using Veratox quantitative aflatoxin test, the Aflatoxin concentrations in the samples ranged between 0-49 ppb with a mean value of 6.89 ppb. Results obtained from this study showed that aflatoxins were found to be associated with fish feeds in different fish farms in Abeokuta, but, a very high proportion of the feed samples were below the regulatory levels (maximum of 20 ppb) that may not be toxic to the health of the fish according to the regulatory levels for aflatoxins issued by the Food and Administration of the United States. Thus, feeds fed to the cultured fish species in farms in Abeokuta were fit for consumption, with very little or no threat of aflatoxicosis (a disease that can affect many species of fish, when feed contaminated with aflatoxin is consumed).
    Description: Includes: 1 table and 1 figure;Also includes: 13 refs.
    Keywords: Aquaculture ; Conservation ; Nigeria ; Fsh feeds ; Aflotoxin ; Aflotoxicosis ; Aspergillus species ; Aflotoxin in fish feeds ; freshwater environment ; Feed ; Pollution ; Storage ; Storage effects ; Biological poisons ; Fish
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    Some ecological factors of the tropical floodplain influencing the breeding and conservation of Gymnarchus niloticus (Cuvier 1829): a review (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24096 | 19325 | 2018-05-16 14:04:57 | 24096 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Gymnarchus niloticus is the only species of the family Gymnarchidae. It is a popular food fish in most parts of Africa where it is greatly esteemed. In some culture, it is offered as a special gift to leaders during festive seasons, while in some others it is an important part of items presented by a suitor to the parents of a girl at the time of betrothal. It can therefore be inferred that G. niloticus is not only important as food fish with economic significance, but also plays vital roles in the socio-cultural life of some African tribes. The supply of this important species still depends largely on the catch from the wild. However, based on the method of catch, it has been classified as endangered. A close examination of the ecological factors in the floodplain (where it migrates to breed), revealed strong influence on the breeding and survival of the fish. The level of rainfall determines the extent of floodplain inundation, and the abundance and survival of the flora and fauna in the area. These in turn determine the availability of breeding substrates and natural food sources for the various stages of G. niloticus. Therefore, rainfall, the flora and the fauna of the floodplain play vital roles in the breeding and survival of G. niloticus in nature. To ensure the conservation of this important species, controlled propagation strategies that draws on the influence of prevailing ecological factors in the floodplain is recommended. This will ensure conservation, and protect the economic and socio-cultural significance of G. niloticus.
    Description: Includes: 4 figures;Also includes: 36 refs.
    Keywords: Aquaculture ; Ecology ; Fisheries ; Gymnarchus niloticus ; Nigeria ; Ecological factor ; Tropical floodplains ; Breeding ; Conservation ; Gymnarchus ; Tropical floodplains ; freshwater environment ; Flood plains ; Ecology ; Breeding ; Conservation ; Fish ; Food fish ; Commercial species ; Rare species ; Catch/effort ; Ecological distribution
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    Growth performance of wild strains of Clarias gariepinus from Nigerian waters (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24581 | 19325 | 2018-05-20 06:03:14 | 24581 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The catfish (Clarias gariepinus) is the leading aquatic crop in Nigeria. Most of the strains used in aquaculture are suffering from in-breeding depression with its attendant poor egg and sperm quality. There is therefore the need to explore the natural population of the fish to improve performance. This study was carried out to evaluate the growth performance of strains of the catfish across the fresh water systems of Nigeria. Collections were made from the six geopolitical zones namely: North-Central (Kogi), Northeast (Adamawa), Northwest (Kebbi), South-West (Oyo), Southeast (Anambra), South-South (Delta) and domesticated strain obtained from Lagos. The fish were bred in the wet laboratory of the Department of Fish Technology/Biotechnology of the Institute for Oceanography and Marine Research, Lagos and fed for 12 weeks before subjected to growth study. The study involved allocation of 25 juveniles of each strain in lm hapas installed in a 0.4 ha at Badore fish farm, Lagos, Nigeria,fed 3% body weight twice daily while sampling forth-nightly. The results showed that the domesticated strain of C. gariepinus performed significantly better (a=0.05) than the six wild strains studied. This may be attributable to selective breeding which probably had been carried out by the farmers from which the broodstocks were purchased and mixture of the gene pool of improved Dutch strain commonly cultured. There was however no significant variation in the SGR and FCR among the strain. However, the growth study showed that the strain from North-West (Kebbi) did not perform as much as other strains in terms of these growth indices. Hoewever, it had the highest survival (96%). The strains from Oyo and Anambra however showed better growth over the rest strains from the wild. The implication of the breeding potentials of C. geriepinus strains from Kebbi, Oyo and Anambra is that if several selective breeding of these strains are carried out and the gene pool of Kebhi is combined with any of these two, we are likely to obtain fish seed of better growth and survival.
    Description: Includes: 14 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Growth ; Performance ; C. gariepinus ; freshwater environment ; automation
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    Potential impact of climate change on fisheries and aquaculture in Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24584 | 19325 | 2018-05-20 15:57:28 | 24584 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Climate change will have significant impacts on Nigeria's freshwater and marine aquatic systems. and hence on the countries fisheries and aquaculture. Fisheries and aquaculture are highly vulnerable to changes in weather pattern. and the impacts, which could be negative or positive, will vary from the coastal areas to the drier northern parts of the country. Elevated water temperalures will affect fish physiological processes, thereby affecting spawning. survival of the juveniles, recruit into the exploitable phase of population, population size, production and yield. The impacts of increased flooding of the freswater bodies will be negative through erosion of watershed, destruction of fish feeding and breeding habitats, decrease in primary productivity and alteration of the normal resilience of the aquatic systems, or positive in expansion of aquatic habitats for primary and fish productions especially during the dry season. Drought will exacerbate draw down of the lakes and reservoirs, and insufficient flow in the river hasins for spawning and primary pro duction thereby affecting fish production. Rise in the water level of the Atlantic ocean will lead to intrusion of more salty wafer into The river delta areas, and inundation of the coastal low-lying areas, thus affecting distribution of both the freshwater and marine fishes as a result of changes in the physical and chemical properties of the waters. The impacts will ultimately affect fish population, production and supply, thereby affecting the livelihood of over 26 million people engaged in the primary and secondary sectors of the fisheries industry, as well as food security of the country. The adaptation and mitigation strategies will be based on the peculiar characteristics and interactions of fisheries and aquaculture within the framework of feasible policy instruments. Strategies and policy measures need to be evolved to combat the observable and projected impacts of climate change on fisheries and aquaculture, in order to protect the livelihoods of the fishing communities and food security.
    Description: Includes: 13 references.
    Keywords: Atmospheric Sciences ; Aquaculture ; Fisheries ; Nigeria ; Climate change ; Fisheries ; Aquaculture ; Impacts ; Mitigation ; Food security ; freshwater environment ; automation
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    Benefit related relationship among artisanal fisher folks of Tombo fish landing community (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24603 | 19325 | 2018-05-21 12:20:04 | 24603 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Benefit related relationship among the artisanal fisher folks of Tomho, a fishing community in Western Rural District of Sierra Leone was studied. The study was carried out to ascertain the socioeconomic activities of the target group, their level of involvement and reasons for going into transactional sexual activities. Eighty (80) structured questionnaires were administered to randomly selected fishermen and people engaged in fish related activities and this was backed up hy the record of HIV cases especially among women at tht Tombo Community Health Centre. Data collected from the interview were treated using measure of central tendency such mean and percentages and results are presented in tables and charts. Respondents age ranged between 15-65 years; sex (fishermen to fish traders) was 71.3% (female) and 28.75% (males) respectively. Marital status of respondents was single, married, divorced, seperated and widowed. Predominant religion of repondents was Islam and Christianity. The study revealed that transactional sex in the study area is mediated by economic structural and environmental factors. The study also revealed that 70.12% of documented HIV cases at the Tombo Community Health Centre were female, while 29.87% were male between the active age of 15-55 years. Fish traders (68.8%) constituted the highest carriers of HIV in the study area.
    Description: Includes: 9 references.
    Keywords: Fisheries ; Sociology ; Nigeria ; Tombo ; Fishing communitu ; Transactional sex ; Socio-economic ; Community health Centre ; freshwater environment ; automation
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    Impact of water hyacinth (Eichhornia crassipes) on fish catch in the lower Taylor Creek area of Bayelsa State (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24605 | 19325 | 2018-05-21 12:24:48 | 24605 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The aim of the study was to access the impact of water hyacinth, Eichhornia crassipes on fish catch in the lower Taylor Creek area of Bayelsa State. The experimental approach involved the division of the creek into new stations: infested and non-infested at the littoral zone. Subsequently, the deployment of six Malian traps with dimensions of 70cm diameter and 80cm height were set in each station for a period of six months using groudnut cake as bails. Furthermore, fish caught were counted and identified into families and species. From results, fish species composition obtained from the stations were a total of 9 families and 15 species. However, it was observed that the water hyacinth infested area had the lowest fish catch while the non-infestated area had the highest number of fish catch for both dry and wet season. It is therefore concluded that the invasion of Eichhornia crassipes impacted on fish population and composition.
    Description: Includes: 12 references.
    Keywords: Ecology ; Fisheries ; Nigeria ; Eichhornia crassipes ; Fish catch ; Taylor creek ; Bayelsa ; freshwater environment ; automation
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    Acute toxicity test in aquaculture: a review (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24610 | 19325 | 2018-05-22 05:57:31 | 24610 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Acute toxicity test involves estimation of LC50 or LD50 which is the concentration or dose which proved to be lethal causing death to 50% of the tested organisms. This article reviews the methods utilized for the determination of probit and LC50 and also explain the use of Minitab 14 statistical package and Microsoft office excel 2007 for accurate, speedy and qualitative presentation of toxicity results. We also present a brief review on the relationship between uptake route of toxicants and their toxic effects.
    Description: Includes: 19 references.
    Keywords: Aquaculture ; Pollution ; Nigeria ; Bioassay ; LCsub50/sub ; Probit ; Computation ; Minitab 14 ; freshwater environment ; automation
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    Assessment of heavy metals in water and fish from Ibrahim Adamu Lake, Jigawa, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24612 | 19325 | 2018-05-22 05:59:44 | 24612 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The study was conducted to assess the levels of heavy metals in water and the flesh of tilapia (Oreochromis niloticus). Water and tilapia were sampled for a period of 12 months from October, 2003-september 2004. Water and muscle tissue were analysed for Cu, Cr, pb, and Zn using flame atomic absorption spectrophotometer. The assessment showed Cr (3.35mg/l), Cu (0.75mg/l), pb (0.81mg/l) in water while Cr(2.27mg/kg) and pb (0.27mg/kg) were found to be high in the tissue samples and were above the values recommended by WHO and the Food and Agricultural Organization (FAO)of the United Nations and therefore not safe for human consumption.
    Description: Includes: 17 references.
    Keywords: Fisheries ; Pollution ; Oreochromis niloticus ; Nigeria ; Heavy metals ; Oreochromis niloticus ; Atomic absorption ; Spectrophotometer ; freshwater environment ; automation
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    Survey of physical characteristics of the upper reaches of new Calabar River, Niger Delta, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24618 | 19325 | 2018-05-22 06:12:36 | 24618 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: One of the priority research projects of the Nigerian Institute for Oceanography and Marine Research (NIOMR) is broodstock development and mass propagation of silver catfish, Chrysichthys nigrodigitatus of which the broodstock is naturally abundant in New Gala River. Selected physical characteristics and water physico-chemical parameters of the upper reach of the New Calabar River at Aluu were investigated. The highest depth value of 9.20 m was recorded in the middle of the river. The width of the river measured during spring high tide and low tide were 174 m and 110 m respectively. The cross-sectional area and average flow velocity of the river were 797.13 m2 and 0.374 m/s respectively. The discharge of the river was computed as 298.13m3/s. The river water was acidic most of the period (Hydrogen ion concentration, pH: 5.12 to 7.43), with low total alkalinity values (4.00 to 12.00 mgCaCO3/L) and low total hardness values (11.5 to 51.2 mgCaCO3/L) which indicate that the river water is black and soft. There was significant (p~,0.05) seasonal variation in temperature (23.1 to 31.7~'C\}, Secchi transparency (9.30 to 19.00 cm), total hardness (11.5 to 51.2 mgCaCO3/L), dissolved oxygen (5.20 to 7.50 mg/L) and dissolved oxygen deficit (0.02 to 2.95mg/L). These results are useful for several stake holders who use the river as a sink for trade wastes, as source of water for fish farming, as source of broodstocks of Chrysichthys nigrodigitatus, as raw water for water treatment plants, and as means of transportation of industrial materials.
    Description: Includes: 16 references.
    Keywords: Chemistry ; Fisheries ; Limnology ; Chrysichthys nigrodigitatus ; Nigeria ; New Calabar River ; New calabar River ; Physical characteristics and physico-chemical features ; Seasonal variation ; freshwater environment ; automation
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    Effects of atrazine on Nile tilapia (Oreochromis niloticus) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24616 | 19325 | 2018-05-22 06:07:52 | 24616 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Mechanization of agriculture to promote and improve the yields from agricultural practices has necessitated the use of pesticides and other agrochemicals. The effects of using these pesticides on the environment are rarely considered by farmers. This study investigated the effects and sub-lethal effect of atrazine on tilapia, an ubiquitous culturable fish species. The 96 hr LC50 was determined using static renewal bioassay method while the effect on haematological parameters was determined after exposure for 3 weeks to sub-lethal doses of atrasine. The LC50 was found to be 6.977mg/l. Sub-lethal exposure resulted in anaemia and increased the white blood cell counts.
    Description: Includes: 11 references.
    Keywords: Aquaculture ; Pollution ; Oreochromis niloticus ; Nigeria ; Nile tilapia ; Atrazine ; Lethal ; Sub-lethal ; freshwater environment ; automation
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    Physico-chemical parameters in relation to fish production of Dadin Kowa Dam, Gombe State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24619 | 19325 | 2018-05-22 06:14:16 | 24619 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Eight month physicochemical study of Dadin Kowa Dam was carried out forthnightly from July, 2011 to february 2012. Air temperature ranged from 18.25~'C ~c 28~'C ~c 0.50 to 28~'C ~c 2.16. Water tmperature ranged from 18.75~'C ~c 2.21. Transparency ranged from 11.00cm ~c 1.83 to 29.63 cm ~c ~c 2.14. Conductivity ranged from 13.00~Ks/cm ~c 13.33 to 41.38~Ks/cm ~c 5.54. Hydrogen ion (pH) ranged from 6.69 ~c 1.03 to 8.39 ~c 1.17. Dissolved oxygen ranged from 6.39mg/l ~c 1.03 to 10.14mg/l ~c 1.17. Total alkalinity ranged from o.69mg/l ~c 0.38 1.34mb/l ~c 0.02. Total ammonia ranged from 0.20mg/l ~c 0.027 to 0.83mg/l ~c 0.05. There were various levels of correlation between these parameters. There was no significant difference between both sites and months (p〉0.05) of all the parameters except total nitrogen which show a significant difference between the sites (p〈0.05) and transparency also shows a significance between the months (p〈0.05). All physicochemical parameters were almost within the tolerable limits for supporting aquatic life.
    Description: Includes: 27 references.
    Keywords: Fisheries ; Chemistry ; Nigeria ; Dadin Kowa Dam ; Physico-chemical parameters ; Fish production ; Dadin Kowa Dam ; freshwater environment ; automation
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    Genetic status of tilapia at Badore landing site using RAPD markers (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24620 | 19325 | 2018-05-22 06:15:41 | 24620 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Molecular technique based on Random Amplified Polymorphic DNA (RAPD) analysis was applied to study genetic status among tilapia species from Badore landing site of Lekki lagoon. Individual variations within species population were assessed using PCR-RAP analysis with five Operon primers (OPC04, OPA02, OPB08, OPE02 and OPF03, Operon Technologies Inc, USA) which revealed dif ferent banding patterns of varying primer reproducibility. Graphical representation using UPGMA cluster analysis produced a dendrogram chart with five clusters (~f, ~e, ~p ,~S, and ~W) indicating different degrees of variations and similarities. There were various levels of genetic similarity observed possibly due to hybridization. Nevertheless, few distinct variations among the samples were visible, show ing possible genetic variability. At 0.89 (89%) coefficient, cluster,~f is made up of 7 samples which are genetically similar. At 0.834 (83.1 %) coefficient, distinct sample BTl2 forms a cluster (~p) with cluster ~f which shows they are related at this coefficient. Cluster ~W (84% coefficient) comprising of 7 samples forms another cluster with a distinct sample BT06 at about 0.79 coefficients. At 78.6% coefficient (cluster ~e). All the samples are genetically similar except sample BT17. This distinct sample can increase genetic variability by a cross between it and other strains of tilapia. Therefore, care should be taken by fish farmers who buy or use the fish samples from this landing site for culture. Proper molecular characterization of this fish species before culture becomes necessary to avoid genetic problems.
    Description: Includes: 17 references.
    Keywords: Biology ; Fisheries ; Nigeria ; Genetic ; Tilapia ; RAPD ; Badore ; freshwater environment ; automation
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    Evaluation of protein fractions of indigenous clariid fish species (Clarias gariepinus and Heterobranchus bidorsalis) and their reciprocal hybrids (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24624 | 19325 | 2018-05-22 06:22:00 | 24624 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Electrophoresis of Myofibrillar and Sarcoplasmic muscle proteins of African catfish, Clarias gariepinus, Heterobranchus bidosalis and their reciprocal hybrids in South-West Nigeria was carried out to reveal the similarities and dissimilarities among species in other to aid the selection of suitable strains for aquaculture that could lead to production of new varieties of fishes to alleviate the problem of short supply of fast growing quality fish seeds. The study was aimed at analyzing the muscle protein profiles of C. gariepinus, H. bidor salis and their reciprocal hybrids. Sixteen juveniles fish samples (comprising four samples from each mating combinations) artificially propagated and reared for sixteen weeks were analyzed eleclrophorelically. Myofibrillar and sarcoplasmic fractions were prepared by homogenizing 150mg of fish muscle in 1.5ml of rigor buffer containing 10mM Trismeleates, 60 mM K Cl, 5mM MgCl〈sub〉2〈/sub〉 1nM EDTA. Extracts were centrifuged in a tube at l0,000g for 5 min at 4~'C. The resultant pellets (myofibrilla) and supernatant (sarcoplasmic) separated using 12.5% Sodium Dodecyl-Sulphate Polyacrylamide Gel Electrophoresis (1D SDS-PAGE). The relative concentration of individual protein bands were analyzed using Tota/Lab?1D software. The individual protein bands in the electrophoregram were identified in relation to their molecular weights. A total of eleven and seven protein bands were resolved in Myofibrilla and Sarcoplasmic fractions respectively. The 5th band with molecular weight (MW) of 52.23 KDa of the myofibrilla electrophoregram distinguished C. gariepinus from H. bidorsalis while the 3rd band with MW 119.04, 4th band with MWs 101.49 & 102.13; 8th band with MWs 29.24 and 29.39 KDa distinct the pure breeds from the hybrids. However, in sarcoplasmic fraction, the 3rd and 5th bands with MWs 92.11 KDa and 54.28 KDa respectively distinguished the hybrids in the while the 7th band with MW 41.67 KDa distinct the pure breeds. Therefore, this research will serve as a bridge between the existing gaps of information available on the muscle protein profile of C. gariepinus, H. bidorsalis and their reciprocal hybrids and the study identifies the proteomic classification of Clariid species with the aim of enlightening fish researchers and aquacullurists on the characterization of broodstock selection for successful breeding exercise.
    Description: Includes: 18 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Heterobranchus bidorsalis ; Nigeria ; Myofibrilla ; Sarcoplasmic ; Rigor buffer ; C. gariepinus and Heterobranchus bidorsalis ; freshwater environment ; automation
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    Preliminary investigation of fish species abundance of Otammiri River, Owerri, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24626 | 19325 | 2018-05-22 06:25:03 | 24626 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A study of fish species abundance of Otammiri River, Owerri, Nigeria was conducted from April to August, 2012. Four hundred and three (403)fishes belonging to 10 families, 16 genera and 21 species were collected from artisanal fishers using various fishing gears. The fish samples were taken to laboratory, identified, counted and their weights and lengths measured. The unnamed cichlid species ranked highest in percentage number and weight as well as Index of Preponderance (38.7%, 33.6% and 51.1% respectively), while the least were Polycentropis abbreviata, Hepsetus odoe, Synodontis omias, Chrysichthys aluensis and Chrysichthys furcatus each constituting 0.2% of the total number of fish collected. Among fish families, Cichlidae ranked highest in percentage number (82.63%) and weight (81.2%), followed by Hepsetidae (5. 7% and 8.0%) and Anabantidae (4.47% and 2.8% respectively). The least were Characidae, Notopteridae and Mochokidae. The presence of an unnamed fish species in the river is an indication that there could be more unknown aquatic living resources with strong potential benefits to the River. The information provided in this study reflects the potential of the fish resources of Otammiri. This will serve as invaluable baseline tool in fisheries management planning and policy formulations that will enhance the development of fisheries in the area.
    Description: Includes: 15 references.
    Keywords: Ecology ; Fisheries ; Polycentropsis abbreviata ; Hepsetus odoe ; Synodontis omias ; Chrysichthys aluensis ; Chrysichthys furcatus ; Nigeria ; Otammiri River ; Index of preponderance ; Fisheries management ; Otammiri River ; freshwater environment ; automation
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    Protein profile expression of Clarias gariepinus, Heterobranchus bidorsalis and their reciprocal hybrids in Southwest Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24623 | 19325 | 2018-05-22 06:20:02 | 24623 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Proper genetic characterization would help in the selection of suitable strains for aquaculture that could lead to production of varieties of fishes to alleviate the problem of short supply of fast growing quality fish seeds. The study was aimed at analyzing the muscle protein profiles of Clarias gariepinus, Heterobranchus bidorsalis and their reciprocal hybrids. Sixteen juveniles fish samples (comprising four samples from each mating combinations) artificially propagated and reared for sixteen weeks were analyzed electrophoreti cally. The separation of the different polypeptides of C. gariepinus, H. bidorsalis and their reciprocal hybrid were carried out using 12% Sodium dodecyl, sulphate polyacrylamide gel electrophoresis (JD SDS-PAGE). The relative concentration of individual protein bands were analyzed using Total Lab〈sup〉TM〈/sup〉 ID software. The individual protein bands in the electrophoregram were identified in relation to their molecular weights. The gel images obtained after electrophoresis were scored and subjected to cluster analysis. The lst, 2nd, 4th, 8th, 9th, 10th, and l1th bands were detected across all mating combinations. The 5th band with molecular weight (78.58 distinguishes C. gariepinus from H. bidorsalis while the 6th band with molecular weight (54.41 KDa) distincts the reciprocal hybrid Clariabranchus from Heteroclarias. The 7th and 12th bands distinguished the pure breeds from the hybrids. The 7th band was present in both hybrids-Clariabranchus (49.50 KDa) and Heteroclarias (49.77 KDa) species but absent in the pure breeds while 12th was present in the pure breeds-C. gariepinus (19.92 KDa) and H. bidorsalis (20.29 KDa) but absent in the hybrids. The cluster analysis shows a high level of genetic similarity among the mating combinations which affirms the already established monophylogenetic relatedness among the species.
    Description: Includes: 18 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Heterobranchus bidorsalis ; Nigeria ; Electrophoregram ; Protein profile ; Clarias gariepinus ; Heterobranchus bidorsalis ; freshwater environment ; automation
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    Fecundity, gonadosomic index and spawning period of Chrysichthys nigrodigitatus of the Lower Cross River, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24629 | 19325 | 2018-05-22 06:30:19 | 24629 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The estuarine catfish, Chrysichthys nigrodigitatus, is a prized food fish in Nigeria especially in the Niger Delta region. There is a growing concernrn over the sustainability of the fishery in the face of climate change and environmental variability. Studies were conducted on the fecundity, gonadosomatic index and the spawning period of the species. The objectives were to determine the average fecundity of the species and to use the gonadosomatic index to determine its spawning period with the aim of proffering management advice and prerequisites of the species in the face of climate change. A total of 44 females and 40 males were used for the study which spanned the period from May 2011 to April 2012. The fecundity of the species ranged from 3,730.5 eggs to 41,535.9 eggs. There was correlation between the total fecundity and fish weight (p~,01, r= 0.80, n= 44). The regression model for the relationship was expressed as fecundity = 4660.8+4.76 weight. The gonadosomatic index was highest in the month of May and dropped sharply in june signifying that spawning in Chrysichthys nigrodigitatus starts around this period. The implications of these findings in respect to sustainability of the species, and its aquaculture in the face of climate change are discussed.
    Description: Includes: 14 references.
    Keywords: Fisheries ; Atmospheric Sciences ; Chrysichythys nigrodigitatus ; Nigeria ; Lower Cross River ; C. nigrodigitatus ; Reproduction ; Climate change ; Cross Rivber ; Sustainability ; freshwater environment ; automation
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    Fish processing technologies in Eti-Osa Local Government Area of Lagos State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24671 | 19325 | 2018-05-23 07:46:56 | 24671 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Traditional fish processing technologies vary widely in terms of equipment type, size and processing efficiency in Nigeria's coastal states. This study was carried out to identify fish processing technologies and evaluate the effectiveness, energy sources and efficiency of fish smoking equipment in use in the study area. Data were collected using structured questionnaire administered between January and March, 2011 in seven fishing villages along the coastline in the lbeju-Lekki LGA, Nigeria. Major fish species being processed were identified; and the profitability of the post harvest technologies adopted was evaluated. A total of five traditional fish processing equipment were observed; and included galvanized iron sheet supported by planks 51 (46.4%); drum oven 8 (7.2%); black clay oven 24 (21.8%); red clay oven 9 (8.1%); brick kiln 5 (4.2%) and government model kiln 4 (3.5%). Generally, energy sources were fuel wood and charcoal for traditional fish processing equipment; and electricity for the government model kiln. Majority of traditional fish processors were peasant women; and three types of processing technologies were observed, including air drying (1.0%), hot smoking 169.1%); and salting and smoking (29.9%). The capacity of kilns and ovens observed ranged from 20 to 50kg daily with a price range of Nl0,000 to N50,000. Factors considered before replacement of smoking equipment by the processors were equipment ruggedness, cost and production capacity. Women's involvement in traditional fish processing was 95%; and major fish species in the value chain included Ethmalosa fimbriata, Caranx senegallus, Sardinella maderensis,Drepane africana, Cynoglossus monodis, Pseudotolithus megalensis, P. typus, Arius latiscutatus and A. mercatoris. It was observed that products of traditional fish processing industry were readily acceptable to consumers and commanded marginal market prices with optimal economic benefits to processors.
    Description: Includes: 25 references.
    Keywords: Fisheries ; Nigeria ; Fish value chain ; Coastline ; Processors ; Women ; Traditional fish processing equipment ; freshwater environment ; automation
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    Re-maturation of spent female broodstock of Macrobrachium vollenhovenii fed trash fish (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24675 | 19325 | 2018-05-23 07:50:27 | 24675 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Gravid female broodstock of M. vollenhovenii were collected from Ogun River. Their body weights ranged from 17.2g, 22.4g and 17.4g while the total lengths ranged from 9.7cm-11.7cm. The broodstock were stocked in three plastic tanks and allowed to spawn naturally. Three spent female broodstock were stocked separately in plastic tanks containing six (6) litres of freshwater. They were fed trash fish twice daily at 5% body weight. The spent females started to develope eggs again in 21 days with full maturation at 35 days. The body weights after 35 days ranged from 8.5g-24.1g while the total lengths ranged from 11.4-11.9 cm. The result obtained have shown that spent female broodstock of M. vollenhovenii can become gravid again in plastic tanks in 35 days when fed fresh trash fish. This will ensure all year round production of broodstock for development of M.vollenhovenii.
    Description: Includes: 9 references.
    Keywords: Aquaculture ; Macrobrachium vollenhovenii ; Nigeria ; Ogun River ; Re-maturation ; Trash fish ; Macrobrachium ; freshwater environment ; automation
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    Fisher folk's response to climate change in New Bussa and its environs of Kainji Lake Basin, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24661 | 19325 | 2018-05-27 14:57:38 | 24661 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The study examined fisher folk responses to climate change in Kainji lake basin. The sample comprises of fisher folks within and New Bussa. Eighty questionnaires were administered to obtain the primary data and analysed using descriptive and inferential statistical tools. The results revealed that majority (70%) of the respondent were male, however (61.2%) of them had tertiary education. Majority (60%) of the respondents were aware of changes in climate in the area. Majority (65%) and (55%) of the respondents were involved in incidence of deforestation and charcoal production respectively. In conclusion, it was discovered that little knowledge about climate change and its effects were found among fisher folk. Therefore it recommends that sensitization workshops/lectures be done to enable the fisher folk have adequate knowledge on climate change and the implications on fisheries activities in the basin.
    Description: includes: 11 references.
    Keywords: Pollution ; Fisheries ; Nigeria ; Climate change ; Fisher folk ; Fishing community ; Awareness ; freshwater environment ; automation
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    Public relations and extension services in Nigerian fisheries industry (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24663 | 19325 | 2018-05-27 14:59:47 | 24663 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The paper discussed the importance of fish as a food commodity and the rich icthyofauna resources of Nigerian territorial which has not been optimally utilized to be sustainable. Among the challenges facing the fisheries subsector of Nigerian economomy apart from overfishing, poor post-harvest technology and high incidence of sea piracy is poor level of communications, public relations, restricted access to extension services especially to the rural artisanal fisherfolks/fish farmers in Nigeria . This has been identified as contributory to the increasing shortfall between demand and supply of fish in Nigeria. There is a need/or a good public image fisheries concerns. Production and marketing personnel need to respect the wishes of the consumers and have good interpersonal relationships. Communication should be a 2-way affair between the extension officers and the fisherfolks in the rural communities to be achieved. The various media that could aid better dissemination in the Fisheries subsector were highlighted. The author recommended better funding, training of extensionists and target audience, improved public sensitization of rural practitioners to fish output. There is a need for a more productive and result-oriented reform in Nigerian extension system. A unified extension is also recommended for effective extension education from the stage of production, handling, processing, transport and retailing. More conducive enabling environment should be created by the government.
    Description: Includes: 13 references.
    Keywords: Fisheries ; Nigeria ; Public relation ; Communication ; Funding ; Extensionists ; Fisherfolks ; freshwater environment ; automation
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    Comparative nutritional composition of smoked catfish (Clarias gariepinus) produced from NIOMR smoking kiln and local cut-drum oven (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24668 | 19325 | 2018-05-23 07:52:49 | 24668 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The effects of two different preservative equipment-the NIOMR (Nigerian Institute for Oceanography and Marine Research) kiln and local cut-drum oven-on crude protein, minerals and vitamins of C. gariepinus were studied. The fish were obtained from Africa Regional Aquaculture Centre, Aluu, Port Harcourt. Moisture, crude protein, crude fibre, crude fat and ash content were determined using standard methods. There were significant differences (P〈0.05) in the moisture and crude fiber content. The moisture content of the fish sample ranged from 2.18 to 5.98, this could be attributed to the drying methods. The crude fibre content ranged from 2.78 and shows no significant difference. The ash content of the samples ranged from 0.25- 0.6%, an indication that smoking reduces the ash content of fish. Result of the crude protein of fresh fish was 21.84 ~c 1.10 which increased to 59.53 ~c 1.88 and 35.41 ~c1.00 in NIOMR smoking kiln and local oven respectively. This means that, there was a significant different in the effects of the two dryers on crude protein. The vitamin content of both ovens showed no significant difference except in vitamin A which was significant in the fish dried with smoking kiln. There was significant different (p〈0.05) in the mineral content of the two drying equipment, this was in Sodium, Potassium and Phosphorus level of fish smoked with NIOMR smoking kiln. This result indicates that the two drying methods have varying effects on the nutritional quality of catfish, which is in favour of NIOMR kiln.
    Description: Includes: 8 references.
    Keywords: Fisheries ; Nigeria ; Smoking ; Production ; Preservative research ; Quality ; freshwater environment ; automation
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    Marine protected areas and the benefits of their establishment (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23254 | 19325 | 2018-03-25 14:38:39 | 23254 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Marine Protected Areas (MPAs), conservation and fisheries management tool, come in various sizes and shapes, and fulfill various purposes. They pre established for purposes of protection, restoration and preservation of' biota, ecosystem and ecological processes, and include recreational, educational and cultural purposes. Steps in the establishment of MPAs, their benefits and effectiveness have been highlighted. Current and profitable trends as seen in the establishment of Network of MPAs have been reported also. It has been noted that there is much benefit in using MPAs as management and conservation tool for natural aquatic resources, yet less areas have been demarcated for these purposes in comparison to the vast aquatic B ecosystem potential for such uses. When the factors militating against successful MPAs establishment such as funds for establishment and sustainable management, in-situ training, local capacity building and requisite biological and ecological data are. addressed; and stake holders fully engaged, the benefits derived there from would tremendous.
    Description: Includes:- 28 refs.
    Keywords: Law ; Conservation ; ASE ; Nigeria ; marine environment ; Protected resources ; Marine parks ; Resource conservation
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    Effects of diesel-oil spillage of fresh, brackish and marine waters on polyvinyl-alcohol (PVA) synthetic fishing twine (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24184 | 19325 | 2018-05-16 14:38:37 | 24184 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The effects of diesel-oil spillage of fresh (0.4ppt), brackish (25ppt) and marine (37ppt) waters on elongation (cm) and breaking load (kgf) of artisanal PVA synthetic twine of varied diameter (4mm, 6mm, 8mm and 10mm) soaked for 16 weeks was studied. Chemical (solubility) test was carried out to identify the experimental twine as PVA among other synthetic twines. The elongation (cm) and breaking load (kgt) of PVA twine diameters were tested by tensile-strength gauge machine (0-200kg) and was carried out in unpolluted (control) and polluted states (spillage level) at 0%, 20%, 40%, 60%, 80% and 100% diesel-oil concentrations of different water salinity. Factorial statistics was used to analyze the treatments; twine (at four levels), water salinity (at three levels) and concentrations (at six levels). This implies 4 by 3 by 6, replicated in four places (288 treatments). Results indicated that elongation (cm) and breaking load (kg) of the specimens were significantly (P〈0.05) influenced by twine thickness. Twine l0mm soaked in 3.0 litres of unpolluted freshwater had significant (p〈0.5) correlation coefficient r,0.927 and lowest r- value of 0.499 was obtained in twine 4mm soaked in 100% diesel-oil concentration. Significant (P 〈0.05) relationships were observed between the correlation coefficient r = 0.531-0.927 for unpolluted and r = 0.499-0.592 for polluted tests. The study revealed that diesel-oil spillage had negative effects on the quality of twines. The thicker the PVA twine diameters (10, 8, 6 and 4mm) at lowered (0%, 20%, 40%,60%,80% & 100%) diesel-oil spillage of fresh (0.4ppt), Brackish (25ppt) and Marine (37ppt) waters respectively, the higher the significant (P〈0.05) elongation (cm) and breaking load (kgt) were evaluated in most cases.
    Description: Includes: 4 tables.;Also includes: 12 references.
    Keywords: Conservation ; Fisheries ; Nigeria ; Ogun State ; Diesel-Oil ; PVA synthetic fishing twine ; Freshwater ; Brackishwater ; Marine water ; brackishwater environment ; freshwater environment ; marine environment ; Fuels ; Crude oil ; Synthetic fibres ; Yarns ; Saline water ; Fresh water ; Brackish water ; Netting materials ; Gear research ; Tensile strength ; Materials testing ; Comparative studies
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    Solar drying: an alternative to fish drying - a review (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24198 | 19325 | 2018-05-16 15:18:03 | 24198 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Energy is one of the main concerns for the future development of any nation. It is by far the largest merchandise in the world and an enormous amount of it is extracted, distributed, converted and consumed in our global society daily .One major problem regarding agricultural produce is related to the product storage in the harvesting season, and identifying an alternative to marketing fresh produce. A useful option is to prevent wastage of produce by drying, using solar energy. In this regard, solar dryer for domestic as welI as industrial usage could be an effective alternative of saving conventional energy. Utilization of solar thermal energy through solar dryer is relatively in a nascent state in our country. This paper gives a description of the efforts made under several researches to design and develop some types of solar dryers.
    Description: Includes: 23 references.
    Keywords: Fisheries ; Environment ; Nigeria ; Makurdi ; Solar drying ; Dryres ; Drying methods ; Drying system ; Solar dryer ; freshwater environment ; Drying ; Fishery products ; Energy ; Processing fishery products ; Utilization ; Storage ; Aquaculture equipment ; Conservation
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    Water quality and growth performance of Oreochromis niloticus under integration with mallard and muscovy ducks (2021)
    FISON | Lagos (Nigreia)
    In:  http://aquaticcommons.org/id/eprint/24575 | 19325 | 2018-05-20 05:51:39 | 24575 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A study was conducted to evaluate the effect of duck manure and spilled duvk weed on water quality and production of Oreochromis niloticus in an intigrated system utilizing two loacl duck weed breeds. Treatment 1 (T1) consist of fish (mean weight, 20.7 ~c 1.28g) stocked at a density of 5 fish/m2 pond and integrated with 12 mallard ducks (Anas platyrhynchas); treatment 2 (T2) consist of fish (mean weight, 21.86 ~c 0.93g) stocked at a density of 5 fish/m2 pon and integrated with 12 Muscovy ducks (Cairina moschata) with treatment 3 (T3) was the control (72m2 fish pond without integration). Fish with treatment two was fed compounded feed of 30% crude protein content three times daily while those in T1, T2 fed on duck manure and spilled duck feed (15% crude protein content). Water quality parameter of the fish pond, growth parameters of the fish and duck were monitored. After a 12-week experimental period, mean weight gain of fish were 140.68, 122.11 and 157.19g in T1, T2 and T3 respectively, while percentage survival was high in T3 and lower in T2. Water quality parameter was generally favorable for fish growth in the treatment. Mallard ducks are recommended for the duck-fish system since they perform better than Muscovey duck both in survivability and ability to engender fish growth.
    Description: Includes: 17 references.
    Keywords: Pollution ; Aquaculture ; Oreochromis niloticus ; Nigeria ; Oreochromis niloticus ; Muscovey ; Integration ; Water quality ; freshwater environment ; automation
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    Threats to fish biodiversity conservation in Echara River, Ebonyi State, Nigeria (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24111 | 19325 | 2018-05-16 14:20:32 | 24111 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A study on threats to fish species conservation in Echara River, Nigeria was carried out from September 2009 to February 2011 to generate inferential data for Fisheries policy formulations to assess the potential of the Fishery to alleviate malnutrition among the poor in the rural communities, and use of the living resources for teaching and research. A total number of 709 fishes comprising of Fin-fishes and shell-fishes belonging to 13 families, 19 genera and 40 species were caught in 216 fishing efforts, at 10 days interval using hooks and lines (size 13), cast nets, gill nets and traps of mesh sizes of 50mm, 75mm and l00mm respectively. Fish identification was done using taxonomic keys. Evaluation of fishing methods of the Artisans within the basin was by visual survey and the use of structured questionnaires. It was observed that during the dry season, 55% of artisanal Fishers used obnoxious methods to catch fish, ranging from chemical toxicants (14%), unselective Fishing gears (35%) and direct draining (6%). It was concluded that there is an urgent need for monitoring the impacts of human activities on freshwater systems and to evolve appropriate implementable management strategies, backed up by political will to check anthropogenic impacts that have deleterious effects on the fishery.
    Description: Includes: 2 figures and 1 plate;Also includes: 8 refs.
    Keywords: Ecology ; Fisheries ; Nigeria ; Ebonyi R. ; freshwater environment ; Fish ; Biodiversity ; Conservation ; Inland water environment ; Taxonomy ; Identification ; Species ; Catching methods ; Evaluation ; Artisanal fishing ; Collisions ; Overexploitation ; Pollution ; Climatic changes ; Fishery surveys ; Fishery policy
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    Assessment of water quality parameters and trace metal contents of drinking water sources in Minna, Niger State (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24615 | 19325 | 2018-05-22 06:05:28 | 24615 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This study assessed the physico-chemical parameters and heavy metal concentration of tap and borehole water in Minna metropolis. The experiment lasted over a period of three months from May to July 2012. Six (6) locations were identified within Minna metropolis, Bosso, Kpagungu, Chanchaga, Mobil, Maitumbi, and Tunga where water samples were randomly taken once every month. Hydrogen ions concentration, chloride, Sodium and Potassium were determined by the method of American Public Health Association (1995), while temperature was measured with thermometer. Air and Water temperature were determined in situ, while Hyd rogen ions concenration (pH), Ionic conductivity, Alkalinity, Hardness, Chloride, Sodium, Potassium and Heavy Metal concentration, copper, zinc, and Lead were determined in the laboratory. The parameters measured showed marked variation across months and locations. values of physico-chemical and concentration of heavy metals in Tap and Borehole water variables studied showed that parameter measured, fell within the recommended ranges for aquaculture and drinking water. Water temperature showed significant difference (p〈0.05), while conductivity, hardness, alkalinity, sodium and potassium showed no significant difference (p〉0.05) amongst the months. The physico-chemical parameters assessed, indicated that most of the parameters fell within standards set by the Federal Ministry of Environment. Comparison between tap and borehole water of each location in Minna metropolis did not show significant difference in temperatures of the locations (p〉0.05). However, significant difference was observed in conductivity of the various locations (p〈0.05).
    Description: Includes: 12 references.
    Keywords: Health ; Pollution ; Nigeria ; Water quality parameter ; Trace metal ; Minna metropolis ; freshwater environment ; automation
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    Haematological profile of hormonal sex-reversed Sarotherodon melanotheron (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24633 | 19325 | 2018-05-23 07:54:19 | 24633 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Sarotherodon melanotheron fry were reared in six (6) tanks for three (3) months, of which three (3) tanks served as treatment tanks while the other three(3) served as the controle. The fry were fed with 17a-methyl testosterone enzyme, which functions as a sex reversal hormone. The fry were administered this hormone for 30 days, to ensure complete sex reversal. All the S.melanotheron fry were reared to table size for duration of three (3) months, after which the blood samples were taken for both the controle and treatment fishes. It was observed that the sex reversal of S. melanotheron were also captured from the Lagos Lagoon, and their blood samples were also taken and analysed. The result shows that the blood parameters except white blood cell count (WBC), were highest in sex reversed tilapia Red Blood Cell count (RBC), 0.67 x 109, Haemoglobin concentration (HgB), 2.7g/dl, Mean corpuscular value (MCV), 14.7fL\} and lowest in the wild specimens (RBC, 0.14 x 109 HGB, 1.7g/dL, MCV, 10.2fL). WBC was highest however, in the wild specimen with value of 2.0 x 106. The WBC, RBC, HGB, and MCV values for the control specimen were 1.0 x 106/L, 0.33 x 109/L, 2.1 g/dL and 14.7fL. A total protein value for sex reversed specimens was 390nm/mg protein/min, 217nm/mg protein/min and 243nm/mg protein respectively. In this study, the result showed that sex reversal in tilapia culture is not harmful to the metabolism of the fishes, and in fact, results in larger healthier fishes, than those caught from the heavily polluted waters of the Lagos lagoon. Growth and nutrient utilization analysis measurements weekly for the sex reversed and control fish specimen. At the end of the duration of the experiment, the sex-reversed fishes growth rate (SGR) of 17.59, and the control specimen had a SGR value of 10.31. The results highlighted the suitability of culture systems for the rearing of S. melanotheron.
    Description: Includes: 22 references.
    Keywords: Aquaculture ; Sarotherodon melanotheron ; Nigeria ; Sand dredging ; Ikpa River ; Plankton ; Water quality ; freshwater environment ; automation
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    Length-weight relationships of Hyperopisus bebe occidentalis in Zaria Dam (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24631 | 19325 | 2018-05-22 06:33:31 | 24631 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The morphometric parameters of 54 Hyperopisus hebe occidentalis obtained from Zaria Dam were investigated. The length occidentalis examined ranged from 18.9-41.0 cm and weight ranged from 25-425g, the largest male weighed 175g while the female was 425g. The length-weight relationship of H. Bebe occidentalis in Zaria showed a positive correlation (r=0.897) in both regression exponent (b〉3) for both sexes showed positive allometric growth pattern. The mean condition factor obtained (0.95- 1.26). In both sexes, the condition factor generally increased with increase in individual size of the fish irrespective of sex but slightly in male than female.
    Description: Includes: 13 references.
    Keywords: Ecology ; Fisheries ; Hyperopisus bebe ; Nigeria ; Zaria Dam ; Microbiological ; Proximate analysis ; Biochemical characterization ; S. nigrita ; Mormyruss ; C nigrodigitatus ; freshwater environment ; automation
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    Comparison of microbiological and proximate analysis of Synodontis nigrita, Chrysichthys nigrodigitatus and Mormyrus rume in Olomore market, Abeokuta, Ogun State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24632 | 19325 | 2018-05-22 06:35:03 | 24632 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The study was carried out to compare the microbiological and proximate analysis of fresh Synodontis nigrita, Mormyrus rume and Chrysichythys nigrodigitatus sold at Olomore market, Abeokuta, Ogun State. This fish are always available at Olomore market and other market around Abeokuta and its environment. The protein, carbonhydrate, moisture, and ash of the fishes was based on the method of analysis of the Association of Official Analysis (AOAC:1990). Data for each sp. were subjected to analysis of variance (ANOVA). The Results show no significant difference in moisture content of Chrysichthys nigrodigitatus (70.99 ~c 1.09%), Mormyrus rume (67.30 ~c 4.08%) and Synodontis nigrita (67.33 ~c I.99%). The crude protein content of Chrysichthys nigrodigitatus (12.10 ~c 0.74%) Mormyrus rume ( 15.48 ~c 1.63%) and Synodontis nigrita (I0.73 ~c 0.61%). For carbohydrate content we have Chrysichthys nigrodigitatus (1.15 ~c 0.13%9), Mormyms rume (2.09 ~c 0.20%) and Synodontis nigrita (2.04 ~c 0.10%). Fat content of Chrysichthys nigrodigitatus (7.15 ~c 1.29%) Mormyrus rume (8.97 ~c I.9%) and Synodontis nigrita (8.62 ~c 0.89%) and for ash content of Chrysichthys nigrodigititus (6.33 ~c 0.69%), Mormyrus rume (4.89 ~c 0.21%) and Synodontis nigrita (8.85 ~c 0.27%). For crude protein there was different (p 〈 0.05) same with fat content, ash content, and carbohydrate content (p〈 0.05) unlike moisture content and dry matter content which is (28.57 ~c 1.55%), (32.50 ~c 4.08%) and (32.67 ~c 1.99%) in Chrysichthys nigrodigitatus, Mormyrus rume and Synodotis nigrita. Result showed total bacteria count from (1.9 to 3.8 x 10〈sup〉6〈/sup〉 cfu/ml) from Chrysichthys nigrodigitatus while (2.8 to 4.7 x 10〈sup〉6〈/sup〉 ur cfu/ml) was obtained for Synodontis nigrita and (2.6 to 3.8 X 10〈sup〉6〈/sup〉cfu/ml) for Mormyrus rume. The micro-organism isolated were pseudomonas spp; Escherichia spp; Klebsiella spp; omomls spp, Escherichia spp., Klebsiella spp., Staphylococcus spp., Proteeus spp. and Micrococcus spp. On biochemical characterization the following bacteria was isolated Pseudomonas spp., Escherichia spp., Klebsiella, spp. staphylococcus spp., Proteus Micrococcus spp.
    Description: Includes: 44 references.
    Keywords: Ecology ; Fisheries ; Chrysichthys nigrodigitatus ; Mormyrus rume ; Synodontis nigrita ; Nigeria ; Haematology ; Sex-reversal ; Growth paramwters ; Nutrient utilizatio ; S. melanotheron ; freshwater environment ; automation
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    Preliminary studies on some physico-chemical parameters and fish species composition of Doma Dam, Nasarawa State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24638 | 19325 | 2018-05-24 09:36:38 | 24638 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Study of some Physico-chemical parameters and fish species composition of Doma Darn was carried out between the month of August 2012. Fishing communities along the dam were selected at sampling stations and collection of fish species. The values of physico-parameters obtained for stations were in the range of 28.10-92 m for depth, 27.70-28.48~'for temperature, 7.03-7.64 for PH, 7.23-7.64mg/l for dissolved oxygen (DO), 30.08-31.75 ntu for turbidity, 94.64-105.17mg/l for alkalinity and 79.17-80.58mg/l for total hardness. The result indicated that there was significant difference (p〈0.5)for depth, temperature turbidity and alkalinity, while there was no significant difference (p〈0.05) for DO, pH and water hardness among the stations. The result of these parameters among the duration shows that there was significant different (p〈0.05) in all the parameters except pH. The study revealed that there were twenty-five (25) fish species belonging to 12 families in the dam. The family Cichlidae and Mochokidae and Bagridae which has three each, While the family, Polypteridae, Channidae, Centropomidae, flepsetidae and Protopteridae has the lowest number of one (1) each. The overall result revealed that the Phvsico-chemical parameters were mostly influenced by duration and not much by stations; and parametersoaram measured were within the recommended water quality requirement for growth and survival of aquatic organisms.
    Description: Includes: 10 references.
    Keywords: Chemistry ; Fisheries ; Nigeria ; Doma Dam ; Doma Dam ; Fishing community ; Physico-chemical parameter ; Fish species ; freshwater environment ; automation
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    Economic analysis of a water recirculation system catfish farm (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24639 | 19325 | 2018-05-24 09:37:45 | 24639 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The operational costs and revenue generation of a catfish farm operating water recirculation system was analyzed from May 2007 to April 2008. The farm operated the Dutch Model system with annual capacity of 30 tons of African catfish for grow-out facility. It had a small hatchery using water flow-through system. Total operational cost for 12 months period was Nl, 058,288.00 ranging 48,400 to Nll6, 850.00 monthly. Similarly total revenue generated was Nl, 166,220.00 with a monthly range of N33.670.00 to N68.890.00. The gross profit for the period of study was N107, 932.00 which was very minimal. The highest expenditure item was salaries, accounting for 34% followed by fish feed which accounted for 32% of the total costs. The catfish farm was not operating at full at the time of this study. However the analysis has highlighted that payment of salaries and feed procurement were major items that will determine the profitability of this investment. Consequently, reduction in salaries and feed costs will reduce the operational costs and thus make the project more viable.
    Description: Includes: 6 references.
    Keywords: Aquaculture ; Nigeria ; Operational cost ; Revenue ; Profit ; Aquaculture ; freshwater environment ; automation
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    Climate change and the challenges of fisheries resources management in Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24642 | 19325 | 2018-05-24 09:44:51 | 24642 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This paper takes a practical look at the challenges faced by fisheries resources in Nigeria due to climate change. It shows that Chad which produce 60% of smoked fish in Nigeria worth N2.6 billion is at the brink of extinction and is expected to dry to a mere 2000 sq km by year 2010 from over 25,000sq km in the 1960s. In simple clear terms, the paper gives practical adaptation and policy to face the challenges of climate change.
    Description: Includes: 11 references.
    Keywords: Environment ; Fisheries ; Nigeria ; freshwater environment ; automation
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    Whole rocky fresh water prawns, Caridina africana as replacement for fish meal in diets for African catfish (Clarias gariepinus) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24658 | 19325 | 2018-05-27 14:53:28 | 24658 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Specimens of Caridina africana were oven dried at 110~'C for 24 hours and refrigerated at 200~'C prior to proximate analysis. Whole rocky freshwater prawn meal (WRFWPM) was evaluated as a dietary replacement for fish meal in the diet of C. gariepinus fingerlings. The diets were fed to triplicate groups of C. gariepinus fingerlings (10.6 ~c 0.08g) reared in concrete tanks, to assess the effects of its partial or complete replacement with fish meal for 90 days. The diets comprised a control which contained fish meal as a protein source; 0% and four others on weight basis at 25%, 50%, 75% and 100% in which fish meal was progressively substituted with WRFWPM. The crude protein content was 40% and fed at 4% body weight of the fish per day. Results shows that the daily body weight gain, feed conversion ratio, protein efficiency ratio and protein productive values were highest in diet with 50% replacement, closely followed by diet with 25% replacement. All parameters were significantly different for all diets (p〈0.05). Higher dietary inclusion WRFWPM of 75% and 100% led to decrease in growth performance and nutrient utilization of C. gariepinus fingerlings. The cost WRFWPM was significantly lower than that of fish meal. Though the economic viability of C. africana is yet to be evaluated due to its tiny size; its substitution as a fish meal replacer in the diet of C. gariepinus is considered profitable.
    Description: Includes: 25 references
    Keywords: Aquaculture ; Ecology ; Clarias gariepinus ; Nigeria ; C. africana ; C. gariepinus ; Prawn ; Digestibility ; Replacement ; Proximate ; freshwater environment ; automation
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    Communication strategies / matrix for stakeholders' adaptation to climate change issues in Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24664 | 19325 | 2018-05-27 15:01:44 | 24664 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Over the years, man has exploited the ocean and its resources for sustainable livelihood. Man's indigenous and traditional knowledge has been the mainstay and guidance in exploiting the ocean and coastal resources. However, as industrialization and other climate conditions set in to alter or modify the productivity of the ecosystem, there has been a lot of concern by international, regional and local authorities to continuously study the prevalence of these factors and triggers off these climatic changes and their impacts on livelihood of fisherfolks at the industrial or artisanal level of fishing and other fisheries activities like fish farming and fish processing. A quantum of technical and scientific information on the ocean and interactions with other elements have been archived in various libraries, information centers and on the internet. These channels provide information for only those who can access them for policy formulation but cannot actually reach those who will benefit or implement the issues discussed in the policy documents for their livelihood. Meteorological data are reported in technical terms. Figures and other illustrations cannot be utilized by the average artisanal and industrial fishermen for the rational exploitation of the ocean resources. The woman fish processor who uses solar dryer may not be able to relate the weather condition and why her fish cannot dry at the normal time. There are times natural phenomenon like change in the direction of or its intensity can be interpreted by a fisherman as the handwork of his enemy to thwart his fishing effort for that day. Oceans sourge causes and its possible displacement of coastal dwellers might not be fully comprehended by those living in coastal communities. There is the need therefore to develope a communication and outreach strategies using a simple communication matrix for easy articulation of approaches to communicating with all potential and identified stakeholders in Climate change and its effects on stakeholders. This paper therefore discusses some of the climatic conditions and factors that affects the ocean, coastal areas and their productivity. It particularly focuses on communication strategies of information, educating and entertaining in reaching out to identified stakeholders on climate impacts for its rational exploitation and improved income for better standard of living. It finally produced a simple applicable communication matrix for reaching out to all stakeholders in Climale change and its impacts.
    Description: Includes: 10 references.
    Keywords: Pollution ; Fisheries ; Nigeria ; freshwater environment ; automation
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    Collection of broodstock and juveniles of Macrobrachium vollenhovenii from the wild (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24676 | 19325 | 2018-05-23 07:51:33 | 24676 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A total of 457 broodstock and 143,000 juveniles of Macrobrachium vollenhovenii were collected at Isheri Olofin area and Okunmanya River over a period of time. They were transported live to the shrimp hatchery of NIOMR in Lagos. Live transportation of the broodstock of M.vollenhovenii with body weight ranging from 71.0-264.5g in liter-capacity plastic containers half-filled with water, recorded 98-100% survival rate between 80-110 minutes transportation time. However, live transportation of the juvenile in 50 liters capacity plastic containers without water recorded survival rates ranging from 20-66% while those carried with water and aerated recorded 12.5-93.75%. An air conditioned vehicle was used during the live transportation. Higher mortality rate was recorded for the juvenile than the broodstocks due to large number transported in additoin to the small-size gear used for trapping the jiveniles. The study has developed a simple technology for the collection and transportation of live specimens of broodstock and juveniles of M. vollenhovenii. Efforts will be made to increase survival of the juveniles through the use of larger containers and gears.
    Description: Includes: 20 references.
    Keywords: Aquaculture ; Macrobrachium vollenhovenii ; Nigeria ; Transportation ; Broodstock ; Juvenile ; M.vollenhovenii ; freshwater environment ; automation
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    Preliminary study on the antioxidative and anti-fungal effects of ginger oil on the shelf life of hot smoked fish (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24670 | 19325 | 2018-05-23 07:45:45 | 24670 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The anti-oxidative and anti-fungal effects of ginger oil on smoked Chrysichthys nigrodigitatus, Clarias gariepinus and Oreochromis niloticus was examined during five week storage at room temperature (25-30)~'C. The ginger oil was extracted from fresh ginger through hydro-distillation. The fish samples were gutted washed thoroughly and each fish species was divided into three groups. Two groups were spiced with 1.0ml and 1.5ml of ginger oil/kg of fish respectively before they were smoke dried for 2 hours. The third group acts as the control which was not spiced with ginger oil. Chemical and microbiological analyses were performed to investigate quality changes, and to determine the shelf stability of the products. The lowest TBA (14.64 mg MDA/kg), and Peroxide (3.91 mEq/kg) values were recorded in 0. niloticus samples treated with 1.5ml ginger oil/kg of fish at week 1, while the highest TBA (30.48 mg MDA/kg), and PV (18.76 mEq/kg) occurred in the C. gariepinus control at week 5. The result also revealed that samples treated with ginger oil had lower mould count than the control, but there was no significant different (P~.0.05), when compared to the control after 5 weeks of storage.
    Description: Includes: 21 references.
    Keywords: Fisheries ; Nigeria ; Catfish ; Ginger ; Peroxide ; Quality ; Smoked ; Storage ; Thiobarbituric acid ; freshwater environment ; automation
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    Design and building of a monk gate using mild steel plate and carbon steel valve (2021)
    FISON | Lagos (Nigreia)
    In:  http://aquaticcommons.org/id/eprint/24577 | 19325 | 2018-05-20 05:55:29 | 24577 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A design for the building of a monk gate that is safe and easy to operate was constructed for storing water in the pond as water harvesting structures, solving several purposes of farm needs such as supply of water for irrigation, cattle feed, fish production etc. The structure is made from mild steel plate and carbon steel ball valves. It functioned efficiently on installation into a monk designed for it (that has its groove).
    Keywords: Aquaculture ; Engineering ; Nigeria ; Sluices ; Steel plate (mild and stainless) ; Ball valve (carbon or stainless) ; Zinc-oxide and monk gate ; freshwater environment ; automation
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    Microbiological quality of fresh catfish raised in ponds fertilized with raw sterilized poultry manures (2021)
    FISON | Lagos (Nigreia)
    In:  http://aquaticcommons.org/id/eprint/24576 | 19325 | 2018-05-20 05:53:00 | 24576 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A total of 2,800 catfish (Clarias gariepinus) were stocked in fourteen (14) 5 by 4 m2 earthen ponds in NJFFR Integrated Farm, New Bussa, Niger State. Raw and sterilized poultry manure of 0.13 to 0.52 kg/m3 concentrations were used to fertilize the ponds with the unfertilized ponds serving as control. The following bacteria were isolated from the poultry manure; Escherichia coli, Aeromonas hydrophila, Salmonella typhi, Shigella dysenteriae and Staphylococcus aureus. The microbial loads of samples increased with increase in concentration of manure. The fish samples from the 0.13 and 0.26kg/m3 sterilized manure fertilized ponds had no count in their fish flesh unlike others. However, the fish from the control ponds had the least with 0.68 log10 CFU/g while that of fish harvested from 0.52 kg/m3 raw manure fertilized ponds had the highest with 2.24 log10 CFU/g. Pathogenic enteric organisms like S. typhi, S. dysenteriae and A. hydrophila were not present in the fish flesh of the fish from the sterilized manure and control samples. The study revealed that fish samples from sterilized manures were better in terms of microbial safety for fish productions; hence sterilized manure is recommended for use in fish production to ensure the microbial safety of the fish, handlers and that of the consumers.
    Description: Includes: 11 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Catfish ; Pathogens ; Microbial quality ; Raw and sterelized manure ; freshwater environment ; automation
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    Predatory size of dragonfly (Palpopleura lucia) nymphs on guppy (Poecilia reticulata) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24578 | 19325 | 2018-05-20 05:57:42 | 24578 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Attainment of adulthood by a young fish is a function of environment, competition, starvation, cannibalism and predation amongst other factors. Predators do not exhibit predatory qualities from birth, it has to grow over time before the qualities are expressed. Thus, the aim of this study was to determine minimum size of dragonfly (Palpopleura lucia (Dmry, 1773) nymphs (Naiads) that can predate on guppy (Poecilia reticulata [W.K.H. Peters, 1859]) with a view to understanding predation in aquaculture. Guppies of 5mm to 12mm total length were introduced to naiads of varying lengths ranging from 2.00 mm to 10.00 mm over a 48-hour period. Results obtained showed that naiads ~. 6.00mm were able to predate on guppies while those ~, 5.5mm co-habited with guppies without predation. This study thus concludes that aquaculture management practices can be geared towards eliminating naiads ~.6.00mm, this will hopefully assist farmers to optimise human and material resources expended in the control of naiads in aquaculture.
    Description: Includes: 12 references.
    Keywords: Aquaculture ; Nigeria ; Aquaculture ; Naiads ; Prey ; Predator ; freshwater environment ; automation
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    Growth performance of two strains of Clarias gariepinus in indoor and outdoor concrete tanks (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24579 | 19325 | 2018-05-20 05:59:31 | 24579 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Six indoor concrete tanks ( 1.5m x 2.0m x 1m) were stocked with 120 C. gariepinus fingerlings (9.52 ~c 52g). Six outdoor concrete tanks (2m x 2m x lm) were stocked with 240 fingerlings (9.66 ~c 1.52g). The fish samples were collected from Osi Ekiti, Ekiti State and from the National Institute for Freshwater Fisheries Research hatchery, New Bussa, Niger State, both in Nigeria. The fish were acclimatized for three days and were fed with coppens feed. The experimental feed had crude protein level of 40.5% and was fed to the fish for 51 days in two treatments indoor and outdoor. There was no significant variation (p〉 0.05) in the mean initial weight, mean final weight, mean weight gain, food conversion ratio, protein intake, specific growth rate and percentage survival of fish stocked indoors. There was significant difference (p〈 0.05) in the protein effic1ency ratio of fish fed indoors. There was significant difference (p〈 0.05) in the mean weight gain. mean final weight, food convertion ratio, protein intake and protein efficiency ratio of two strains of fish fed the diet outdoor. There was no significant difference (p〉 0.05) in the specific growth rate and percentage survival of the two strains of fish fed outdoor. The highest weight gain was ohserved in the outdoor fish from Osi and the lowest weight gain was recorded in the indoor from New Bussa.
    Description: Includes: 32 references.
    Keywords: Aquaculture ; Ecology ; Clarias gariepinus ; Nigeria ; Growth ; C. gariepinus ; Indoor ; Outdoor ; freshwater environment ; automation
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    Screening of lactic acid bacteria from the gut of Chrysichthys nigrodigitatus for use as probiotics in aquaculture production (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24599 | 19325 | 2018-05-21 12:13:12 | 24599 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Lactic and bacteria (LAB) namely Lactobacillus plantarum l and L. pentosus were isolated from the gut of Chrysichthys nigrodigitatus using Bergey's manual of determinative bacteriology (API- 50 CHL, BioMerieux). They are beneficial and safe organisms that improves disturbances of the indigenous microflora and host's immune system. Gut removed from fish samples were dissected and divided into 3 regions: fore gill, mid gut and hind gut. Lactobacillus plantarum l and L. pentosus were isolated from these regions using MRS (de Man, Rogosa and Sharpe) agar and broth after subsequent culture and sub culture to obtain discrete colonies. They were characterized as gram-positive, non-motile, catalase negative and non-sporulating bacteria.
    Description: Includes: 7 references.
    Keywords: Aquaculture ; Chrysichthys nigrodigitatus ; Nigeria ; Probiotics ; Lactic and bacteria ; Chrysichthys nigrodigitatus ; Fish farming ; freshwater environment ; automation
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    Effects of water quality of the Buguma creek on tilapia culture (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24591 | 19325 | 2018-05-20 16:07:10 | 24591 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Ecological parameters of water samples of the Buguma creek were evaluated. The parameters varied between high and low tide, with the maximum salinity level of 20”ppt”and lowest level 9”ppt”. The highest pH value of 7.7 occurred in January and lowest 5 in May. Simi larly, maximum ammonia level of 2mg/l was observed in May and consistently low levels(〈 0.5mg/l) in the other months. We discussed the viability of tilapia aquaculture and suitability of Buguma creek for its culture.
    Description: Includes: 13 references.
    Keywords: Aquaculture ; Pollution ; Nigeria ; Buguma Creek ; Tilapia ; Aquaculture ; Brackish water ; Water quality ; brackishwater environment ; automation
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    Comparative study of bacterial isolates associated with the skin of catfish (Clarias anguillaris and Heterobranchus bidorsalis) in Kainji Lake area (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24596 | 19325 | 2018-05-20 16:13:09 | 24596 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Sixty apparently healthy Heterobranchus bidorsalis and Clarias anguillaris from NIFFR were cultured and 30 each from Monai and wara villages as wild environments were obtained for the studies. The total bacterial load varied from 2.2 x l05 to 1.08 x l08 and 2.27 x 105 to 6.3 x l08 CFU/g of the skin of C. anguillaris and H.bidorsalis in the culture respectively, while the load varied from 1.77 x 105 to 1.17 x l08 and 2.27 x 105 to 9.0 x l07 CFU/g in the wild respectively. Eleven bacterial general species were identified which include: Bacillus species B.firmus, Pseudomonas species, P. aeruginosa, Escherichia coli, Klebsiella aerogenes, K. ozaenae, Staphylococcus aureus, Streptococcus species, S.faecalis, and Aeromonas species. The aims of this investigation is to compare the type and the load of bacteria isolates on the skin of catfish in both culture and wild environment.
    Description: Includes: 7 references.
    Keywords: Aquaculture ; Fisheries ; Clarias anguillaris ; Heterobranchus bidorsalis ; Nigeria ; Kainji L. ; Comparative study ; Bacteria ; Skin ; Clarias ; Heterobranchus ; Kainji Lake ; freshwater environment ; automation
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    Impact of climate change on brackish water aquaculture development in the coastal areas of the Niger Delta (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24602 | 19325 | 2018-05-21 12:18:46 | 24602 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The issue of climate change has generated a lot of concern among the general public in Niger Delta region in recent time. It has been described in different ways by many people based on their views, perception and understanding. However, little considerations has been given to the impact of climate change on brackish water aquaculture in the coastal areas of Niger Delta. This paper therefore review critically based on existing literature and field experience, the causes of climate change, impact of climate change on aquaculture production such as: increase in temperature, flooding of ponds, increase in water turbidity, heavy siltation of pond bottom, introduction of new species, collapse of farms infrastructure and fluctuations in salinity levels. Also, various adaptation and mitigation strategies that will ameliomerate the impact of climate change in aquaculture operations, namely: reduction in human activiies that are inimical, stable climate, selection of good site suitable for fish farming, provision of shading materials for fish cultured in tanks, raising of pond dykes, good management practices and improvement of monitoring and early warning systems, are explicitly elucidated. As these strategies will go a long way in minimizing the impact of this menace, in the brackish water zone of the region. Moreover, efforts should be made by relevant institutions and agencies to come up with coordinated plans and policies that will reduce the effects of climare change on brackish water aquaculture in the coastal areas of Niger Delta.
    Description: Includes: 26 references.
    Keywords: Aquaculture ; Atmospheric Sciences ; Nigeria ; Niger Delta ; Climate ; Fish ; Coastal environment ; Fish farming ; Niger Delta ; brackishwater environment ; automation
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    Typha latifolia infestation and fish species migration in Hadejia Nguru wetland (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24604 | 19325 | 2018-05-21 12:23:19 | 24604 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The river was divided into two, within each sampling station. Open water and Typha latifolia infested area. The extent of coverage of Typha latifolia each year were determined using line transect. Experimental gill nets were used for the experiment in each location, and the data were collected every three months for the period of two years. The numbers of fish caught and their species in the three sampling sites were recorded. Seventy-four different species of fish were caught in the first year in open water while sixty one different species were caught in Typha latifolia infested area. In the second year seventy-four different species of fish were caught, while forty-five different species of fish were caught in Typha latifolia infested area. Typha latifolia proliferation affects all physio-chemical parameter in water.
    Description: Includes: 7 references〉
    Keywords: Ecology ; Fisheries ; Typha latifolia ; Nigeria ; Infestation ; Typha latifolia ; fish migration ; freshwater environment ; automation
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    Effects of dispersed Bonny Light crude oil on water quality parameters in tanks containing Oreochromis niloticus (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24606 | 19325 | 2018-05-21 12:27:51 | 24606 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The physico-chemical characteristics of water samples contaminated with a mixture of the water accommodated fractions (WAF) dispersed and undispersed phases of Bonny Light crude oil at sub-lethal concentrations of 0.2, 0.4, 0.8 and 1.6ml/L were analyzed to assess their effects on the water quality of test media containing a fish, Oreochromis niloticus. These were measured against a control. The temperature, PH, DO, TDS, conductivity and redox potential of (P〈 0.05) by the presence of the mixture especially by the dispersed phase at the diifferent concentrations, and these were positively correlated.
    Description: Includes: 24 references.
    Keywords: Aquaculture ; Pollution ; Oreochromis niloticus ; Nigeria ; Physico-chemical parameter ; Water accommodated fraction ; O.niloticus ; Crude oil ; freshwater environment ; automation
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  • 80
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    Gross alpha and beta surveys of Lake Kainji water (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24608 | 19325 | 2018-05-22 05:54:40 | 24608 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A gross alpha and beta survey of the water of Kainji Lake was conducted using multi-channel analyzer, a proportional counter detector. This was done to estimate the gross radioactivity concentrations due to natural radionuclides in the lake water. Radioactivity, a phenomenon that leads to production of radiations, and radiation is known to trigger or induce cancer. The gross alpha and beta activity concentration analyzed in the water shows that the alpha activity ranges from 1.0 x 105 Bq/cm3 to 0.7Bq/cm3 with an average value indication of 0.0702Bq/cm3, whereas the beta activity concentration indicated BDL for all the sites with exception of upstream 01 location (9~' 51' 485' and 4~'35' 473'E) which has 0.0022Bq/cm3. This could be attributed to the continued flow of the lake water. Although radioactivity measured in lakes is usual higher than that of flowing waters, because a significant part of the radioactive substance brought in by other tributary rivers accumulates in it (Szaho et al.1998). That of Kainji Lake is entirely different.
    Description: Includes: 9 references.
    Keywords: Limnology ; Pollution ; Nigeria ; Kainji L. ; Gross alpha-beta decay ; Radioactivity ; Lake Kainji ; Contamination ; freshwater environment ; automation
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    Assessment of the bacteriological profile of water and fish samples from Hadejia reservoir in Jigawa State (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24609 | 19325 | 2018-05-22 05:56:26 | 24609 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Hadejia reservoir is a floodplain complex in north eastern Nigeria. This area has long been noted for its importance in fish production. It is also important to both year round native birds and European water birds that travel over the Sahara desert to this wetland to spend their winters. Quantitatiive and qualitative profile of bacteria in the reservoir was carried out. Quantitative analysis of bacteria in the water revealed that the water contained total heterotrophic count (THC) of 3.1 x 103 CFU/ml to 3.5 x 106 cfu/ml and total coliform count (TCC) ranging from 1.4 x 102 to 1.4 x 103 CFU/ml. Bacteria load in the fish intestines were 3.5 x 103 CFU/g and 3.1 x 104 CFU/g for total coliform and total heterotrophic count respectively. Fish gills had less count (2.1 x 102 CFU/g and 3.4 x 102 CFU/g for TCC and THC respectively), than the fish intestines. Bacteria species such as Aeromonas hydrophila, Vibrio cholera, Shigella species were isolated from the water samples. Escherichia coli, Salmonella sp. Shigella sp. were isolated from the fish samples.
    Description: Includes: 12 references.
    Keywords: Ecology ; Fisheries ; Aeromonas hydrophila ; Vibrio cholera ; Escherichia coli ; Nigeria ; Hadejia Reservoir ; Bacteriological profile ; Hadejia reservoir ; freshwater environment ; automation
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  • 82
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    Phytoremediation of iron (Fe) and copper (Cu) by water hyacinth (Eichhornia crassipes) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24613 | 19325 | 2018-05-22 06:02:51 | 24613 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This study was carried out to investigate the ability of Water Hyacinth (Eichhornia crassipes [Mart.]Solms) to absorb and translocate iron (Fe) and copper (Cu). The study was conducted with three concentration gradients of Fe and Cu at 10mg/l, 15mg/l, 20mg/l and control (no metal); the whole set-up was done in triplicates and the experiment lasted for 12 weeks. The results showed that iron (Fr) had the highest accumulation value in the root (1.12 ~c 0.42), while copper (Cu) had the highest value in the leave (0.38 ~c 0.06); both at 20mg/l. Statistical analysis showed that there was significant difference among treatment (p&lt0.05). Translocation factor (TF) is the ratio between metal concentrations in aerial part to metal concentration in the root. Metals that are accumulated by plants and largely stort in the roots are indicated by TF values less than 1, when greater than 1, its indicate good translocation capabilities. The TF value for Fe ranged from 0.49 ~c 0.57- 0.68 ~c 0.27 in leaf, and 0.64 ~c 0.17- 0.77 ~c 0.18 in the stem. While the Translocation factor values for Ca ranged from 0.78 ~c 0.08- 1.12 ~c 0.12 in leaf and 0.72 ~c 0.32- 1.09 ~c 0.19 in the stem. This reveals that Cu had better translocation capability than Fe. Highest values of bioconcentration factor (BCF) for Fe and Cu were 2.32 ~c 0.65 at 20mg/l and 0.72 ~c 0.01 at 15mg/l obtained in the root and leaf respectively, indicating that the accumulation potential of Fe by water hyacinth is higher than Cu. In conclusion, according to the accumulation capabilities of the investigated plant (Eichhornia crassipes), this study showed that the plant was found to be a promising candidate for phytoremediation and adequate for bio-monitoring programs for contaminated water.
    Description: Includes: 32 references.
    Keywords: Biology ; Pollution ; Nigeria ; Phytoremediation ; Translocation factor ; Bioconcentration factor ; Biomonitoring ; Bioaccumulation ; freshwater environment ; automation
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    Fish hybridization in some catfishes: a review (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24622 | 19325 | 2018-05-22 06:18:20 | 24622 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A review of hybridization of some catfishes shows that catfish hybridization among other aspects of biotechnology has continued to raise interest among researchers of various disciplines such as fish biologists, geneticists, aquaculturists, molecular biologists, nutrion scientists and so on. The studies so far reported were from seasoned researchers from several works of life and disciplines who have direct or indirect interest in fish hybridization (especially catfishes). It could be thus, concluded that though there is a dearth in literary work on catfish hybridization considering their numbers and diversities. However, several interesting works can be found across continents (especially Africa, Asia, and North America) that shows that catfish hybridization holds a very high potential for the future. Better catfish hybrid is equivalent to a better catfish aquaculture as well as it contribution to global food security.
    Description: Includes: 29 references.
    Keywords: Aquaculture ; Nigeria ; Hybridization ; Catfish ; Aquaculture ; freshwater environment ; automation
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    Preliminary studies on the food and feeding habits of Synodontis membraneceus from Ogobiri River, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24625 | 19325 | 2018-05-22 06:23:51 | 24625 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The food and feeding habits of Synodontis membraneceus of Ogobiri River of Bayelsa State, Nigeria was studied using 44 male and 51 specimens that were bought from fishers in the study area measuring between 5 and 25 cm total length. The Numerical and the frequency of Occurrence method of analysis were used. For the males, the food items by the numerical method were copepods (168), insects, (118), Cladocera (69), and unidentified items (32). In the female specimens, the food items were Cladocera (286), Insect (216), Copepod (100) and unidentified organisms/materials (65). In the Frequency of Occurrence method for the males, Copepod was still with a total of (48), Cladocera (44), Insects (29) and unidentified (16). For the females, Cladoera (48), Insects were (30) by Copepods (35) and unidentified (19). The Percentage composition of food items by the Numerical method was Cladocera (45.5%), Insects (34.5%), Copepod (12.5%), and unidentified items (7.0%) while the Percentage Frequency of Occurrence was, Cladocera, (30.5%), Insects (30.9%), Copepod (29.6%), and unidentified items (9.0%).
    Description: Includes: 21 references.
    Keywords: Ecology ; Fisheries ; Synodontis membraneceus ; Nigeria ; Ogobiri River ; Numerical methods ; Frequency of occurrence ; S.membranneceus ; Ogobiri River ; freshwater environment ; automation
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    Food and feeding habits of Auchenoglanis occidentalis from Lake Akata, Benue State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24628 | 19325 | 2018-05-22 06:28:42 | 24628 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Food and feeding habits of Auchenoglanis occidentalis were analyzed from samples collected between May 2008-April 2009, in Lake Akata. A total of 97 fish specimens were used for the study. The fish specimens used for the study were obtained from fishermen operating on Lake Akata. These fishermen use various fishing gears including hand nets, cast nets and gill nets of various standard mesh sizes (20.2, 25.4, and 30.5mm). Food and feeding habits were investigated using point and frequency of occurrence methods. The seasonal and monthly feeding index were also noted in the stomach contents of Auchenoglanis occidentalis over the period of investigation. The most important food items were Insects, insect larvae, Algae, and Fish scale. The result indicated that Auchenoglanis occidentalis is an omnivore but had a tendency to predate more on insects.
    Description: Includes: 22 references.
    Keywords: Ecology ; Fisheries ; Auchenoglanis occidentalis ; Nigeria ; Akata Lake ; Auchenoglanis occidentalis ; Food and feeding habits ; Lake Akata ; Nigeria ; freshwater environment ; automation
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    Fishing trials of metal drum trap in the Upper Nun River, Bayelsa, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24636 | 19325 | 2018-05-23 08:00:42 | 24636 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A drum fishing trap was designed and constructed using normal metal drum material. The trap is easy to construct and has high capacity to catch fish. The fishing trap was selective of the specie Chrysichthys nigrodigitatus of the family Bagridae. Total cost of production was N5,000.00 which is affordable by an average artisanal fisher. The preliminary survey of fish composition of the trap January and June, 2013 revealed that a total of eight \{8) fish species belonging to 4 families were observed. The most abundant families were the Bagridae with three \{3) species which constituted 87.82% of the total sample collected, followed by the Mochokidae (7.61%) and Clariidae (3.55%) while the least percentage was Malapteruridae (1.02%).
    Description: Includes: 11 references.
    Keywords: Fisheries ; Chrysichthys nigrodigitatus ; Nigeria ; Upper Nun River ; Drum fishing trap ; Production cost ; Catch composition ; freshwater environment ; automation
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    Catch composition of Malian trap (gura) in Lower Taylor Creek area, Bayelsa State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24637 | 19325 | 2018-05-23 08:02:11 | 24637 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The Catch composition of Gura Trap was studied in the Lower Taylor Creek, Bayelsa State, Nigeria. Twenty-seven traps with 1, 2 3 valves were exposed to 48 hours at a time, for 5 weeks between May and June 2012. A total of 11 species of fish belonging to 8 families were recorded in this study. The family Cichlidae had the highest number with 67.6% of the total catch. The result further showed that Tilapia guineensis was the most abundant species (41.9%) in terms of number, while Protopterus annectens was most abundant (67.16%) in weight. This study needs to be further expanded to cover all seasons, so as to know the traps and true species selectivity throughout the year.
    Description: Includes: 10 references.
    Keywords: Fisheries ; Protopterus annectens ; Nigeria ; Lower Tailor Creek ; Gura trap ; Specie selectivity ; Lower tailor Creek ; freshwater environment ; automation
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    A comparative study of the decomposition of Rhizophora racemosa and Nypa fruticans of the great Kwa River, Cross River State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24641 | 19325 | 2018-05-24 09:41:43 | 24641 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Mangroves are specialized marine ecosystem which is highly productive. They act as shelter, breeding and nursery grounds for a variety of Marine and brackishwater invertebrates and fishes. Some of the dominant plant species in mangrove vegetation of Nigerian coastline are Rhizophora species and Nypa fruticans. Studies were conducted on the decomposition of Rhizophora species and N. fruticans. The objective was to compare their decomposition rates and proffer informed management decisions. Decomposition rates of the two were monitored for 112 days using litter box experiment. Eight litter boxes were stocked with 10g of leaves of each species and two boxes containing the respective plants species were removed and examined for dry matter, carbon and nitrogen contents. There was no significant difference in the rates of decomposition of Rhizophora and N. fruticans leaves (p~.0.05) even though N. fruticans showed slightly higher rate of decomposition than Rhizophora. The linear relationship between the loss in dry matter and number were expressed as Y= 10.1-0.080x in N.fruticans, and Y=9.0-0.073x in Rhizophora sp. It was concluded that the argument in favour of the eradication of N.fruticans for the thriving of Rhizophora is inaccurate. Containment of the population rather than control is the logical strategy for the management of the riparian vegetation in the face of climate change.
    Description: Includes: 8 references.
    Keywords: Biology ; Fisheries ; Rhizophora racemosa ; Nypa frutican ; Nigeria ; Great Kwa River ; Decomposition rate ; Nipa palm ; Mangrove ; Ecosystem management ; marine environment ; automation
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    Climate change: mitigation and adaptation strategies in fisheries and aquaculture in Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24644 | 19325 | 2018-05-24 09:50:12 | 24644 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: This paper examined possible mitigation and adaptation measures in small-scale fisheries, aquaculture and the fishing communities in Nigeria to cope with the impact of climate change. It is recognized that mitigation measures in fisheries are limited but must consider options on the inputs, equipments and methods employed in fishing and fish processing activities. Several opportunities for options in the country's artisanal fisheries and aquaculture, and by the fishing communities to reduce their vulnerability change impacts, and protect the livelihoods and food security have been identified. The areas of research on climate change to enhance knowledge on the socioeconomic , biolog1cal and ecological impacts, and to guide decision on mitigation and adaptation in fisheries and aquaculture and the fishing communities, are also outlined. Proper integration of fisheries and aquaculture into the national policy on climate change and the political will for implementation are key to effective climate change mitigation and to ensure sustainable fisheries, and protect the livelihoods and food security in the country.
    Description: Includes: 12 references.
    Keywords: Aquaculture ; Fisheries ; Pollution ; Nigeria ; freshwater environment ; automation
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  • 90
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    Growth response of Nile tilapia (Oreochromis niloticus) fed graded levels of sun-dried cassava peel meal (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24651 | 19325 | 2018-05-26 12:03:29 | 24651 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: A study was conducted at the farm section of the department of fisheries technology, Federal polytechnic Nekede, Owerri in Factorial design of five treatments of cassava peel meal at 0%, 25%, 50%, 75%, and 100% graded levels were formulated. The casssava peel meal was sun-dried for 48 hours, ground, and added to the feed fed to 150 fingerlings of Oreochromis niloticus into 10 tanks in triplicates, and fed twice daily at 5% body weight for 60 days. The result shows that fish fed with 100% cassava peel meal had the highest mean weight gain of 10.46 ~c 0.0l and specific growth rate of 1.23 ~c 0.04. The second best result was shown in fish fed with cassava peel meal with weight gain of 9.93 ~c 0.03 feed conversion ratio (FCR) of 1.75 ~c 0.04 and specific growth rate of 1.24 ~c 0.02. The poorest result was shown by fish fed 25% cassava peel meal with the lowest survival rate, weight gain,feed intake and specific growth rate respectively. This connotes that diet with 100% fed graded level of sun-dried cassava peel meal can best be utilised at a ratio of 75% to 15% CPM, and second best diet with 75% fed graded level of sund-ried cassava peel meal could also be utilized at 11.25% reduction due to its survival rate parameter over the best. Moreover, this proportion should be utilised for improved growth of Nile tilapia (Oreochromis niloticus) for profit maximization.
    Description: Includes: 12 references.
    Keywords: Aquaculture ; Ecology ; Oreochromis niloticus ; Nigeria ; Cassava pel meal ; Growth response ; O. niloticus ; freshwater environment ; automation
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    Supplementation of date palm (Phoenix dactylifera) seed as feed additive in the diets of juvenile African catfish (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24654 | 19325 | 2018-05-26 12:09:10 | 24654 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: The present study was conducted to examine the utilization potential of date palm seed (DPS) as feed additive in the diet of African catfish Clarias gariepinus for improved fed utilization. A total of 150 African catfish (weight ranged from 81.1 to 91.3g) were divided into five experimental groups. The experiment was conducted for 70 days. Experimental diets were identical in all composition except for the variation in DPS inclusion level. Non-inclusion of DPS was used at 0% (control) and other levels are 0.5% (diet 2), 1.0% (diet 3), (diet4) and 2.0% (diet 5). Growth performance and nutrient utilization of African catfish including Weight Gain (WG), Specific Growth Rate (SGR), Protein Efficiency Ratio (PER) and Protein Productive Value (PPV) were significantly (P〈0.05) higher than those diets, where DPS supplementation at 1.5% appears to be generally higher than other levels. In the same trend fish fed DPS supplementation produced improved fish carcass values and the haematology of fish was generally better from diets in overall production performance and subsequent fish quality assessments indicated that the diets containing 1.5% DPS level recronded the best performance in fish compared to other levels including the control diet. Based on the result of the present study, it is concluded that date palm seed supplementation positively influenced growth performance and feed utilization of African catfish as well as ensuring their healthy status.
    Description: Includes: 26 references.
    Keywords: Aquaculture ; Ecology ; Clarias gariepinus ; Date palm seed ; C. gariepinus ; Supplimentation ; Feed additive ; Diets ; freshwater environment ; automation
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    Digestible protein sparing effects of digestible lipids in Clarias gariepinus (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24656 | 19325 | 2018-05-26 12:12:42 | 24656 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-15
    Description: A digestibility trial was carried out on Clarias gariepinus fingerlings 2.25 ~c 0.05g for 4 weeks. The results indicated significant difference (P〈0.05) between the gross and digestible diets as out of 20% lipid/protein fed, only 17.75 was digestible. It was this that apparently spared 22.58% out of 30% protein fed for growth. The groundnut oil based diets also showed significant (p〈0.05) between the gross nutrients fed and actual digestible. From the result only 16.80/25.22% out of 20/30% dietary oil and dietary protein fed respectively. The palm oil based diets also exhibited similar trend protein/lipid ratio 15/35 only 12.87/29.52 dietary palm oil and dietary protein respectively was digestible. However, there was no significant difference (P〉0.05) in the groundnut oil and palm oil. Therefore, the digestible lipids in this study were significantly lower than the gross diets fed.
    Description: Includes: 14 references
    Keywords: Aquaculture ; Ecology ; Clarias gariepinus ; Nigeria ; Protein/Lipid ratio ; Gross nutrient ; C. gariepinus ; Palm oil ; freshwater environment ; automation
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    Fisheries resources and developmental potentials of Usuma River in Gwagwalada, Abuja (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24640 | 19325 | 2018-05-24 09:38:57 | 24640 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A study on fisheries resources and developmental potentials of Usuma River in Gwagwalada, Ahuja was carried out between August and December, 2012 using standard methods and procedures. A total of sixteen (16) fish species belonging to nine (9) families were identified. The fish family Cichlidae was the most dominant by number representing 19.2% of the total catch. This was followed by the family Bagridae (17.5%) and family Cyprinidae (17.5%). There were more females than males which are an indication that with good monitoring, control and surveillance (MCS) the production potential of the river will be high.
    Description: Includes: 14 references.
    Keywords: Fisheries ; Nigeria ; Usuma River ; Fisheries resoirces ; Development potentials ; Fish species diversity ; Usuma River ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
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    Format: 300-302
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    The meeting point between fisheries science and traditional ecological knowledge in fisheries (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24643 | 19325 | 2018-05-24 09:47:33 | 24643 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Traditional Ecological Knowledge (TEK) is the sum of data and ideas acquired by a human group on its environment. Over the years, there has been a growing lack of confidence in centralized scientific fisheries management. Traditional ecological knowledge is recognized as a valuable tool for understanding trends of marine resources, ecosystem management and conservation. Some reseachers and policy-makers have called for TEK to play an increased role in fisheries management decisions. TEK helps to develop management practices which allow economic development without the over-exploitation of natural resources. However, the acceptance of TEK in fisheries management has been partly hindered by difficulties in translating local ecological knowledge into a form that can be applied dierectly to conventional top down approach of western fisheries management. For full integration of TEK and scientific knowledge in fisheries management, there must be constant communication, continuous education, mutual trust, collaborative validation of knowledge and respect for a workmg relationship to be sustained.
    Description: Includes: 17 references.
    Keywords: Ecology ; Fisheries ; Nigeria ; Fisheries management ; TEK ; Scientific knowledge ; Overexploitation ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 310-312
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    Evaluation of beach seine net by-catch in Lake Kainji, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24649 | 19325 | 2018-05-24 09:57:35 | 24649 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Studies on the evaluation of Beach Seine net by-catch in Lake Kainji was conducted in Yuna fishing village. The beach seine net of 306m long and 12m depth was used for this experimental fishing trial. The seining took about 2 hours and was done three times in three different sampling locations in the Lake. A total of 24 fish species were caught, two target species, P. afzeliusi and S. leonensis, and 22 fish species obtained from the by-catch. The overall total number of fish caught was 34,939 of which 96.9% was obtained from the target fish Clupeids while the remaining percentages 3.1% were the by-catch fish. The total weight obtained was 66.2kg, out of which the greatest proportion 50.7% was obtained from target fish and the rest percent 49.3% was recorded from the by-catch and discards fish. About 90% of the by-catch was undersized fish from the commercially important freshwater fishes of Lates, Citharinus, Labeo, Tilapias ctc. Recommendation was made on how to improve the use of this fishing gear in order to conserve and sustain the fisheries resources of Lake Kainji.
    Description: Includes: 11 references.
    Keywords: Fisheries ; Sierrathrissa leonensis ; Pellonula afzeliusi ; Nigeria ; Kainji L. ; Clupeid fishing ; Gear ; Target fish ; Discards ; Lake Kainji ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
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    Format: application/pdf
    Format: 331-334
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    Fisheries survey in Cross River State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24650 | 19325 | 2018-05-26 12:01:47 | 24650 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The survey was performed in the Calabar Municipality, Calabar South, Odukpani, Akpabio and New Bakassi Local Government Areas. Taken as indicator, number of canoes, the largest villages are situated in Akpabio and New Bakassi LGOs and the smallest in Calabar Municipality and Calabar South. The larger villages base economically apart from fishery on oil palm-dominated agriculture. There are villages where each man is a fisher and also a farmer and others, were these main professions are performed by different persons. In the larger villages, there are traditionally operating carpenters (boats builders), hunters, honey samplers and wood cutters. Nearly all women are engaged in fish trading and several as fish and shrimp processor (smoke-drying) and periwinkle sampler/processor. In the larger villages are three sizes of canoes, small for two, medium for seven and large for 10-15 crew members. The small canoes are mainly used for the gill net fishery system on juvenile bonga (ekpai) in the dry season and on croaker and other demersal and semi-demersal species mainly in the raining season and are common in all surveyed villages. They are also used for fisheries with trap, cast net and long line. With mediu sized canoes, it's mainly operated the anchor net for catch of estuarine shrimp and sometimes boat seine for adult bongo (ibat). The larger canoes are engaged in the purse seine fishery on ibat in the near-coastal waters. In most of the larger villages, it is a common expedition fisheries; fishermen leave for up to several weeks out of their homes and operate in the more productive outer estuary and near-coastal waters, mostly on an estuarine shrimp; they produce smoke-dried products in their camps. The mean catch per boat per day for the small about of 5kg, for the medium-sized 15kg and for the larger purse seine canoes more than 100kg. In Calabar Municipality and South LGAs, all catches are sold fresh in own small markets at the landing site. In other LGAs the catches are processing to smoke-dried product is common. However, by using the mostly existing road connections to Calabar, and also selling of fresh fish is performed. By estimation, the monthly mean income per fisher family in the larger villages is N30, 000, after paying for repairs of nets and outboard engine. On the daily income for fish processing and trading, women included N0-500 and the men, probably by N100 or less.
    Description: Includes: 6 references.
    Keywords: Fisheries ; Nigeria ; Cross River State ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 335-337
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    Survey of the present and fast disappearing fish species along two rivers in the Niger Delta (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24647 | 19325 | 2018-05-24 09:55:05 | 24647 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Fisheries resources are on the decline in Nigeria due to over exploitation and inadequate management of her coastal waters. For sustainability of these resources, an adequate knowledge of species composition, diversity and relative abundance of her water bodies must be understood and vigorously pursued. A survey was conducted to determine fish species diversity in Brass and Nun River, Niger Delta, Nigeria and the socioeconomic studies carried out to determine the status of endanger or level of disappearance of fish species study area. The survey identified 53 species from 18 families caught from Brass and Nun stations respectively. The fish diversity from typically freshwater fishes such as Tilapia and Clarias to brackish species such as Chrysichthys nigrodigitatus and Penaeus species. The most abundant family within catch were the Scianidae, Cichlidae and Clariidae. A checklist of economically important fast disappearing fish species along the two water bodies was generated. Oil spillage, discharges from industries (industrialization) and the domestic wastes from boundaries settlements (urbanization) and farming activities along the tributaries were among the factors identified to have contributed to low species diversity and fast disappearance of certain species. Data generated from this study would serve as baseline information for fisheries resource management.
    Description: Includes: 11 references.
    Keywords: Fisheries ; Chrysichthys nigrodigitatus ; Tilapia guineensis ; Penaeus notialis ; Fistularia tabacaria ; Ethmalosa fimbriata ; Sphoeroides pachygaster ; Mobula coilloti ; Nigeria ; freshwater environment ; automation
    Repository Name: AquaDocs
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    Format: application/pdf
    Format: 322-323
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    The response of Tilapia niloticus fed on different feeds composition (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24653 | 19325 | 2018-05-26 12:07:26 | 24653 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Ninety juveniles of Tilapia niloticus were fed on three different composed diets, the locally compounded feeds with fish meal inclusion, (control), the second treatment were fed on imported feed (2) and treatment (3) with locally compounded feed with feather meal inclusion. At the end of eight weeks, it was found out that fish under treatment (1) had the highest feed intake than those of treatment 2 and 3. The weight gained in treatment 2 was higher than 1 and 3. The survival rate were high in this experiment but the means were not significantly different (P〉0.05). (The higher survival rates were attributable to the range of the physiochemical measurement). The Wight gained was attributed to the palatability of the floating nature of the feed. The treatment 3 had the lowest weight gained which might be due to the low palatability as a result of feather meal inclusion in the feed. The feed conversion ratio in treatment 2 was highest, subsequently followed by treatments 2 and 3 respectively.
    Description: Includes: 16 references.
    Keywords: Aquaculture ; Ecology ; Tilapia niloticus ; Nigeria ; Tilapia niloticus ; Feather meal ; Survival rate ; Growth parameter ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 345-349
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    Effects of boiled Jatropha kernel meal as a substitute for soybeans meal in diet of African mud catfish (Clarias gariepinus) fingerlings (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24660 | 19325 | 2018-05-27 14:55:49 | 24660 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A feeding trial was conducted in the laboratory for 8 weeks to evaluate the growth response of C. gariepinus fingerlings using boiled Jatropha kernel as the protein source in place of soybean meal. Four experimental diets (40% crude protein) were formulated, three of these diets contained boiled Jatropha kernel meal at varying levels of 0% 10%, 20%, and 30% while the diet without boiled Jatropha kernel meal served as control. Fish fingerlings were fed weekly at 5% body weight. It was discovered that the percentage weight gain was significantly different (p〈0.05) among the controlled diet and the experimental diets; specific growth rates were also significantly different (p〈0.05) among the controlled diets 3 and 4, but different in diets 1 and 2 with diet 4 (30%) of boiled Jatropha kernel having the highest value. The highest weight gain was recorded in diet 4 containing 30% of boiled Jatropha kernel meal (75.57g), while the least is at 10% inclusion (52.47g). The soybean meal protein increased with increasing boiled Jatropha kernel substitution. Based on the results of this study, it could be concluded that C. gariepinus could tolerate 30% inclusion of boiled Jatropha kernel meal in the diet in place of soybean meal.
    Description: Includes: 23 references.
    Keywords: Aquaculture ; Ecology ; Clarias gariepinus ; Nigeria ; Growth performance ; Nutrition utilization ; C. gariepinus ; Boiled jatropha kernel meal ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 374-379
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    Poverty and inequality among fishing households and implications for fishery resources management in Kainji Lake, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24662 | 19325 | 2018-05-27 14:58:51 | 24662 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Fishing has traditionally been a major source of livelihood for fishing households in Kainji Lake Basin (KLB). It plays a significant role to the rural and national economy in terms of employment, income and source of protein. However, the livelihoods of the primary actors (fishers) are being jeopardized by the depletion of fishery resources, mainly due to over exploitation and poor management. This paper examines poverty among the fishing households in KLB using empirical data. Foster Greer Thorbecke (FGT) Model was adopted for the analysis. The results reveal greater poverty (over 60%) with minimal inequality among fishing households. Finally, the paper advances reasons based on the implications of the study for designing intervention strategies by policy makers and the like.
    Description: Includes: 13 references.
    Keywords: Fisheries ; Sociology ; Nigeria ; Livelihood ; National economy ; Foster Greer Thorbecke model ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 385-387
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