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  • Fish culture  (25)
  • Genetics
  • Akure (Nigeria)  (25)
  • American Chemical Society
  • Public Library of Science (PLoS)
  • WorldFish
  • 1
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    Genetic improvement of freshwater prawn, Macrobrachium rosenbergii (de Man) in India. Phase two: annual report for period January to December 2012 (2021)
    WorldFish | Bhubaneswar, India
    In:  http://aquaticcommons.org/id/eprint/12749 | 115 | 2013-12-03 13:46:30 | 12749 | WorldFish Center
    Details
    Publication Date: 2021-07-05
    Description: Macrobrachiurn rosenbergii is one of the widely cultured freshwater prawn species globally. India was the third largest producer of this species in 2007 and its aquaculture production rose to 43,000 metric tons (t) in 2005 froin less than 500 t in 1995. However, since then production has been declining and in 2008-09 it was 12,856 t, a reduction of more than 70% compared to 2005. There are several contributing factors to this decline, such as slow growth rate, poor survival, disease outbreaks, increase in cost of production, and availability of low risk alternative fish species. However, there is a consensus that poor seed quality leading to unsatisfactory growth and survival rates in ponds is one of the major reasons. Hence, the development of a systematic selective breeding program aimed at improving growth rate and ensuring high survival rate of this species was deemed a high priority. The Central Institute of Freshwater Aquaculture (CIFA), Bhubaneswar, India in collaboration with the WorldFish Center, Malaysia initiated a selective breeding program for this species in 2007.
    Description: CIFA - WorldFish Project on Genetic Improvement of Freshwater Prawn, Macrobrachium rosenbergii (de Man) in India (Phase Two)
    Keywords: Aquaculture ; Prawn culture ; Genetics ; Seed production ; Selective breeding ; Freshwater aquaculture ; India •Livestock and Fish
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 10
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  • 2
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    Strain comparisons in aquaculture species: a manual (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/10991 | 115 | 2013-03-17 12:38:07 | 10991 | WorldFish Center
    Details
    Publication Date: 2021-06-25
    Description: When different strains or breeds of a particular species are available, the best choice is seldom immediately obvious for producers. Scientists are also interested in the relative performance of different strains because it provides a basis for recommendations to producers and it often stimulates the conduct of work aimed at unraveling the underlying biological mechanisms involved in the expression of such differences. Hence, strain or breed comparisons of some sort are frequently conducted. This manual is designed to provide general guidelines for the design of strain comparison trials in aquaculture species. Example analyzes are provided using SAS and SPSS. The manual is intended to serve a wide range of readers from developing countries with limited access to information. The users, however, are expected to have a basic knowledge of quantitative genetics and experience in statistical methods and data analysis as well as familiarity with computer software. The manual mainly focuses on the practical aspects of design and data analysis, and interpretation of results.
    Description: CGIAR Research Program Livestock & Fish
    Keywords: Aquaculture ; Aquaculture ; Genetics ; Selective breeding
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 31
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  • 3
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    Considerations about effective dissemination of improved fish strains (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/10632 | 115 | 2013-07-12 04:44:53 | 10632 | WorldFish Center
    Details
    Publication Date: 2021-06-27
    Description: Aquaculture production systems in developing countries are largely based on the use of unimproved species and strains. As knowledge and experience are accumulated in relation to the management, feeding and animal health issues of such production systems, the availability of genetically more productive stock becomes imperative in order to more effectively use resources. For instance, there is little point in providing ideal water conditions and optimum feed quality to fish that do not have the potential to grow faster and to be harvested on time, providing a product of the desired quality. Refinements in the production system and improvement of the stock used must progress hand in hand. In this paper we deal separately with genetic and non-genetic issues pertaining to the multiplication and dissemination of improved strains. The separation is somewhat arbitrary, and as will be evident from our discussion, there is frequent interaction between the two.
    Description: CGIAR Research Program on Livestock and Fish
    Keywords: Aquaculture ; Aquaculture ; Genetics ; Selective breeding
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 15
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  • 4
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    Risk analysis in aquaculture: A step-by-step introduction with worked examples (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/16659 | 115 | 2015-04-13 11:44:30 | 16659 | WorldFish Center
    Details
    Publication Date: 2021-07-07
    Description: This publication is based on materials covered and outputs generated during the Workshop on Risk Assessment Methodologies and Tools for Aquaculture in Sub-Saharan Africa, which was jointly held by WorldFish and FAO in Siavonga, Zambia on 28 June - 2 July 2010. The workshop was delivered as a training exercise to 17 participants from seven sub-Saharan countries and was designed to highlight current methodologies and tools available for environmental risk analysis in aquaculture development. A key focus of the workshop was to encourage participants to consider hypothetical but realistic scenarios and to discuss issues relevant to evaluating the environmental risks of a given activity or scenario. This publication presents selected scenarios from the workshop and the outcomes of the deliberative process as developed by the participants. This publication is factual but not comprehensive, therefore any statements or estimations of risk do not represent the actual risks arising from the described scenario. It is intended to serve as an easily readable introduction to risk analysis, highlighting worked examples that will provide guidance on how a risk analysis may be approached in a similar situation.
    Description: Food and Agriculture Organization of the United Nations
    Description: CGIAR Research Program on Livestock and Fish
    Keywords: Agriculture ; Aquaculture ; Genetics ; GIFT ; Livestock and fish ; Training ; Tilapia
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 55
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  • 5
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    Clinical changes observed in Clarias gariepinus (Burchell 1822) fed varying levels of ascorbic acid supplemented diets (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23328 | 19325 | 2018-04-06 16:06:27 | 23328 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: This study was undertaken to observe the clinical changes associated with the dietary ascorbic acid supplementation in the diet of African catfish, Clarias gariepinus, using the presence or absence of scorbutic (ascorbic acid deficiency) symptoms as indices. Clarias gariepinus fingerlings (6.02~c 04g) were randomly distributed into glass tanks of 60 x 45 x 45cm3 dimension at ten fish per tank in a triplicate treatment. Five diets containing 40% crude protein was formulated. Ascorbic acid (AA) was supplemented in the diets as ascorbyl-2-polyphosphate (a mixture of phosphate esters of ascorbate). Each treatment had varying levels of ascorbic acid (AA) supplementation, at 0 (Control) 50, 100, 150 and 200mg AA/kg, in Treatments 1, 2, 3, 4 and 5 respectively. Fish were fed practical diets twice daily at 900hrs and 1600hrs. Weekly weighing of fish was done and data collected were subjected to statistical analysis. At the end of week 4, fish fed scorbutic diets (diets without Ascorbic acid) had significantly lower weight than fish fed AA supplemented diets (P〈0.05). After week 6, fish fed scorbutic diet began to develop clinical symptoms including lordosis (lateral curvature), broken skull, pigmentation and scoliosis (vertical curvature). Radiographs confirmed defects in the vertebral columns of fish in this treatment. Highest mortality was recorded in this treatment as 30%, In all parameters considered, treatment 4 fed 150mg AA/kg gave the best AA supplementation that prevented growth reduction and clinical signs of AA deficiency.
    Description: Includes:-3 tables.;11 plates.;17 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; freshwater environment ; Feeding experiments ; Fish culture
    Repository Name: AquaDocs
    Type: conference_item , TRUE
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    Format: 32-37
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  • 6
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    Investment and employment potentials in fish farming in Nigeria (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23330 | 19325 | 2018-04-06 16:09:38 | 23330 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Investment opportunities in aquaculture that could lead to creation of employment in Nigeria was reviewed. Nigeria is a large fish consuming nation with the resource capacity to produce large quantity of fish for the country. The level of unemployment rate is increasing at an alarming rate. Employment opportunities in Agriculture sectors, in the area of Aquaculture deals with several sub sectors such as; seed production, transportation of live fish ,Water quality management, ornamental fish industries, supplies to aquaculture equipment and tools, aquaculture extension service, fish feed, fish meal production, fish processing, integrated rice-cum fish culture, and fish farm labor. These are all investment opportunities that can reduce unemployment, increase food security and poverty alleviation In Nigeria.
    Description: Includes:- 11 refs.
    Keywords: Aquaculture ; Nigeria ; freshwater environment ; Fish culture ; Investments
    Repository Name: AquaDocs
    Type: conference_item , TRUE
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    Format: application/pdf
    Format: 42-44
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  • 7
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    Status of fisheries and aquaculture development in Ekiti State, Nigeria (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23340 | 19325 | 2018-04-07 17:19:26 | 23340 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Ekiti State has limited water surface area but blessed with some rivers and seven big reservoirs on which some artisanal fishery is being carried out by over 400 fisher folks. Fish farming in Ekiti state is largely dominated by Clarias gariepinus culture. Interest in fish farming is on the increase as farmers construct concrete fish tanks as small as 1.5m2 as well as series of contour earthen ponds or tanks as big as 30m2. The total number of ponds has grown numerically from 96 at the inception of the state in 1996 to about 2000 in 2008. The move towards private/public partnership in aquaculture development will improve the economic and nutritional status of the region.
    Description: Includes:- 1 table.;3 figs.;5 refs.
    Keywords: Aquaculture ; Fisheries ; Nigeria ; Ekiti State ; freshwater environment ; Fish culture ; Freshwater aquaculture ; Aquaculture ; Artisanal fishing ; Fishery development ; Stock assessment
    Repository Name: AquaDocs
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    Format: application/pdf
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    Format: 76-79
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  • 8
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    Growth and survival of different sex combinations of Oreochromis niloticus (L) in glass tanks (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23354 | 19325 | 2018-04-08 12:03:29 | 23354 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Growth performance and survival rates of three different sexes of Oreochromis niloticus fingerlings (27.5~c 0.02g); mixed-sex, all male and all female fed 35% CP at 5% body weight was carried out for 56 days in indoor rearing operations. Aquaria tanks (60x30x 30cm3) were used as rearing tanks and each treatment was replicated. All female tilapia had the best specific growth rate (2.54%/day), food conversion ratio (1.98) as well as survival rate (98%), least value was obtained in treatment containing the mixed sex tilapia. Specific growth rate (2.06%/day), Food conversion ratio (2.27) and survival rate (95% ).
    Description: Includes:-2 tables.;1 fig.;7refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; New Bussa ; freshwater environment ; Survival ; Sex ratio ; Food conversion ; Fish culture ; Feeding experiments
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 128-130
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  • 9
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    Efficacy of formalin in the removal of adhesiveness from Clarias gariepinus eggs during artificial propagation (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23358 | 19325 | 2018-04-08 12:11:51 | 23358 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: The aim of this study was to establish the efficacy of formalin in removing the adhesiveness of Clarias gariepinus eggs during artificial propagation and the effects on prospective fry. 1g of catfish eggs were put in five concentrations of formalin \{O.O (control), 0.4, 0.6, 0.8 and 1.0 mg/l\} at three exposure times (10, 15 or 20min). In each treatment, the detachment of eggs increases with exposure time but were not significantly different (P〉O.05). 0.4mg/1 of formalin had the highest number of detached eggs. At the highest formalin concentration 72% of the eggs still adhered together which provide a good substrate for the growth of fungi. The use of formalin delayed hatching of C. gariepinus eggs when compared with the control. The more the exposure period of C. gariepinus eggs to formalin, the higher the hatching time. Survival of fry was highest in the group that has been exposed to 0.4mg/1 and exposure period of l0min. At the highest concentration (1.0mg/l) and exposure period (20min), the survival was lower by 55.5%. Based on this study, the optimum concentration of formalin was O.4mg/l and exposure period of l0min. for the removal of egg adhesiveness, increase hatching and improved survival success of C. gariepinus.
    Description: Includes:- 4 figs.;10 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Akure ; freshwater environment ; Preservatives ; Anticoagulants ; Coagulants ; Dispersants ; Fish culture
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
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    Format: 143-147
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  • 10
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    Gender issues in economics of fish farming in Maiduguri and environs (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23362 | 19325 | 2018-04-08 17:58:42 | 23362 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-14
    Description: This study focused and examined gender issues in economics of fish farming in Maiduguri and its environs. The socio-economic characteristics of the fish farmers were examined. The profitability of the industry and constrains affecting fish farming in the study area were analyzed. Stratified random sampling technique was used due to the heterogeneous nature of the population considering 30% of the fish farmers as the sampled size. Descriptive statistics and net farm income were used to analyse the data obtained. It was revealed that 81.25% of the respondents were male while female fish farmers represented 18.75% of the respondents. 84.40% of the respondents had tertiary education while farmers with secondary certificate and adult education constituted 12.50% and 3.10% respectively. Net farm income profitability analysis of male and female farmers were N193,767:00 and N445,557:00 respectively. It was also observed that the major constraints militating against fish farming in the study area were scarcity of fingerlings, lack of improved technology, inadequate capital, high cost of equipments, lack of land and management difficulties. It was recommended that adequate training, continuous capacity building and improved technology in fish production must be made available to farmers: and farmers should have access to sources of fingerlings.
    Description: Includes:- 3 tables.;2 refs.
    Keywords: Aquaculture ; Sociology ; Nigeria ; Maiduguri ; Women in Fisheries ; freshwater environment ; Sex ; Fish culture ; Women
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 159-162
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  • 11
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    Evaluation of Afzelia africana seeds as protein feedstuff in fish diets (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23368 | 19325 | 2018-04-08 18:08:23 | 23368 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Seeds of the legume Afzelia africana were analyzed and evaluated for use as protein feedstuff in fish diets. The seeds were heated to inactivate the anti-nutritional factors. Two iso-nitrogenous diets (26%) were produced using A. africana or Bonga-fishmeal as protein sources and labeled FI and F2, respectively. The resulting pellets were sinking pellets and were well accepted by tilapia based on the reaction time to feed presence and proportion of pellets eaten within one hour. Fl pellets were more stable in water than F2 pellets with mean dissolution times of 190 mins and 135 mins, respectively
    Description: Includes:- 7 tables.;4 refs.
    Keywords: Aquaculture ; Nigeria ; freshwater environment ; Feeding experiments ; Feed composition ; Feed preparation ; Nutritional requirements ; Nutrition ; Fish culture
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 188-189
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  • 12
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    Survival and response of Oreochromis niloticus to different feeds (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23374 | 19325 | 2018-04-10 16:10:47 | 23374 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: The study determined the survival and the response of Oreochromis niloticus to different feeding compositions. 90 Oreochromis niloticus juveniles were fed different diets in triplicated treatments inside glass tanks. Treatment I comprised locally compounded diet; Treatment II, imported pelletized feed; and Treatment III - processed feathermeal based diet. Results showed that there was no significant differences (P〉0.05) in the weight gain, feed intake, survival and feed conversion ratio. However, Treatment I had the highest feed intake, while treatment n had the highest weight gain and feed conversion ratio.
    Description: Includes:- 4 tables.;21 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; freshwater environment ; Feeding experiments ; Feed preparation ; Nutritional requirements ; Fish culture ; Survival
    Repository Name: AquaDocs
    Type: conference_item , TRUE
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    Format: 29-32
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  • 13
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    Lysine requirement of Oreochromis niloticus (2021)
    Fisheries Society of Nigeria | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23370 | 19325 | 2018-04-10 16:05:46 | 23370 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Oreochromis niloticus was reared in 54 litre glass tanks being fed with 35% crude protein diets for 56 days. A basal diet consisting intact protein from groundnut cake and guinea com (4.56g lysine/100g protein) ,four graded levels of crystalline lysine was added to formulate diets consisting 6.87, 7.30, 7.41, 7.51 g lysine /100g protein and a reference diet of intact protein from groundnut cake, guinea com and fish meal having 5.37g lysine/100g protein was fed to six treatments in triplicate groups. The growth parameters shows there was no significant difference in the mean weight gain, specific growth rate, food conversion efficiency and protein efficiency ratio of fish fed varying levels of lysine. A maxima was obtained from the quadratic equation of food efficiency ratio against graded levels of lysine at 7.3g/100g protein which is the requirement. Carcass ash was higher with the initial fish while crude protein was highest with the the fish fed 7.3g lysine/l00g protein
    Description: Includes:- 6 tables.;22 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; New Bussa ; Fish culture ; Nutritional requirements ; Nutrition ; Feeding experiments ; Lysine
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 11-15
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  • 14
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    Genetic improvement of tilapia: challenges and prospects in Nigeria (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23373 | 19325 | 2018-04-10 16:09:38 | 23373 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: The contribution of tilapia aquaculture in Nigeria to world output is negligible due to stunting, poor market value among others. This paper evaluates the aquacultural credentials of tilapia, some genetic improvement technology in cultured tilapia, namely, ploidy, hormonal sex reversal. transgenic, hybridization, and the necessity of Genetic Improvement in accelerating tilapia production in Nigeria. Investigation reveals the presence of O. niloticus with the highest growth perfermancc index (~h1=3.11) for Lake Kanji which indicates high growth potential in suitable culture environment and could serve as a good starting point for genetic development. The presence of ”wesafu”, an ecotype cichlid, endemic to Epe lagoon, Lagos, which grows to 1500g in the wild, appears to be an excellent candidate for genetic improvement of a commercial strain for the growing aquaculture industry. Tilapia Genetic improvement in Nigeria is faced with a number of setbacks. This includes short- term, scattered and disjointed funding, inadequate genetic research facilities, ecological risk, inadequate skilled manpower and poor documentation of tilapia genetic resources among others. Considering the growing importance of tilapia culture, the need to document, conserve, evaluate and utilize tilapia genetic resources is highlighted to enhance the success of food security in Nigeria.
    Description: Includes:- 3 tables.;26 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; Kainji L. ; freshwater environment ; Fish culture ; Genetics ; Selective breeding
    Repository Name: AquaDocs
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  • 15
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    An integrated chicken-fish system in concrete ponds (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23380 | 19325 | 2018-04-10 16:41:16 | 23380 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Four treatments (in duplicate) were used to detennine the optimum combination ratio in the chicken-fish integrated system in 4 m2 concrete ponds. Treatment I (TI) consisted of a concrete pond integrated with one point-of-lay chicken while treatment 2 (T2) had two point-of-Iay chickens integrated over a concrete pond. Treatment 3 (T3), consisted of three point-of-lay chickens integrated over a pond and treatment 4 (T4) was the control and involved no integration. Each concrete pond was stocked with a poly-culture of Oreochromis niloticus and Clarias gariepinus in a ratio of 3:1. Compounded fish feed was used to feed the fish in T4 twice daily at 5% of their body weight while fish in TI. T2 and T3 fed on wet chicken manure and spilled chicken feed that fell directly into the ponds. The daily manure loading rate ranged from 55.80g in TIR2 (treatment l replicate 2) to 117.37 g in T3RI while spilled feed loading rate ranged from 2.52 in T2R2 to 9.27g in T3R2. The total number of eggs laid was 871 in 84 days. For C. gariepinus, fish in T4RI had the highest mean weight gain of all the treatments and TIRI, the lowest. T3R2 had the highest mean weight gain of all the integrated treatments. For O. niloticus fingerlings, fish in T4 which were fed compounded feed had the highest mean daily weight gain and while those in T1 had the lowest. T4RI fish had the highest mean weight gain while TIR2 fish had the lowest. Fish in T3 had the highest mean weight gain of all the integrated treatments followed by fish in T2. However, physico-chemical parameters were more adverse and survival was lower in T3 than in T2 and so a combination ratio of 20 fingerlings in a 4 m2 concrete tank integrated with two laying chickens (mean weight 1.93 kg) is recommended. This translates to 50 laying chickens/100 m2 concrete pond stocked with 500 fingerlings.
    Description: Includes:- 3 tables.;Refs.
    Keywords: Aquaculture ; Nigeriaa ; New Bussa ; Rice-Fish- Culture ; Poultry-Fish-Culture ; freshwater environment ; Fish culture ; Rice field aquaculture ; Agropisciculture
    Repository Name: AquaDocs
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  • 16
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    Utilization and growth response of Clarias gariepinus fingerlings fed varying inclusion levels of livestock vitamin grower´s premix (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23365 | 19325 | 2018-04-08 18:04:12 | 23365 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: A 70 day experiment was conducted to determine the correct level of inclusion of livestock vitamin premix in the diet of Clarias gariepinus fingerlings and to monitor the utilization efficiency and growth performance of the test fish. 180 fngerlings of C. gariepinus were randomly distributed to six treatments, each weighing 0.76 ~c 0.05g. Thirty fingerlings per treatment were used. Each treatment had varying levels of livestock vitamin premix except the control that had no additional vitamin premix. Weighings of fish were done weekly and feed adjusted accordingly. The data collected were subjected statistically to descriptive and analysis of variance. All the treatments were significantly different from each other and also from the control at (P 〈 0.05). The highest mean weight gain was recorded in treatment 5 (0.910) which had 2% premix inclusion. The carcass analysis showed Ts with the highest crude protein level (64.43%). The highest daily and weekly mean weight gain were recorded in treatment 5; O.013g and 0.130g respectively. The feed conversion ratio (FCR) was lowest in T1, (2.147). The FCR for T5 (2.535) was insignificantly different (P 〈 0.05) from T1,. The fish feed control had the best FCR. T5 had the best utilization and growth performance when the average weight gain and the carcass crude protein composition and energy were compared. The fat deposited in fingerlings fed T5 were moderately (5.63) lower than treatment 6 with 5.86. It can be concluded that the fish fed treatment 5 will be less fatty than fish fed treatment 6 but more fatty than the fish fed the controls.
    Description: Includes:- 5 tables.;12 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; freshwater environment ; Feeding experiments ; Feed composition ; Feed preparation ; Fish culture ; Vitamins
    Repository Name: AquaDocs
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    Format: 170-173
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  • 17
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    Evaluation of Nile tilapia (Oreochromis niloticus L.) fed dietary potato peels as replacement for yellow maize (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23361 | 19325 | 2018-04-08 17:57:30 | 23361 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: The recent increase in the numbers of fast food vendors in Akure means that large quantities of Irish potato peels will be generated and discarded with high propensity for causing environmental pollution. Also the prize of maize in Akure has increased by about 31 % between January and August 2009. Therefore, the present study evaluated the bio-economic use of Irish potato peels in Nile tilapia diets with a view to achieving environmentally friendly and cost effective fish production. Nile tilapia (29.4 ~c 1.40g) was fed five diets (01-05) in glass tanks for 56 days. The basal diet (01) contained 26% yellow maize and 35% CPO Then the yellow maize in diets 02-05 was replaced with potato peels at 10, 20, 30 and 40% respectively. At the end of the experiment, growth of the fish was statistically the same in all treatments. However, fish fed 03 and 04 showed uniform and best potentials while the fish fed 05 had the worst performance indicating 30% replacement as the optimum. Economic estimation showed that lkg diet costs about (N81.6-N103.6) depending on the level of potato peels inclusion in the diets while (1.12-1.67kg) of fish was produced from each treatment with 85-95% survival rate of the fish. Incidence of cost (IC) showed marginal variations among the treatments with 30% replacement having the least and 40% replacement the highest costs of fish production. 40% replacement had the highest IC because of high mortality (15%) and poor growth of fish under the treatment. Similarly, the profit index (PI) was closely related with 30% replacement having the highest profit margin. In conclusion, both growth and economic indices established that Irish potato peels can replace up to 30% of yellow maize in diets of Nile tilapia
    Description: Includes:- 4 tables.;7 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; Akure ; Fish nutrition ; freshwater environment ; Feeding experiments ; Feed efficiency ; Fish culture ; Nutrition
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    Effects of feed colour on growth and nutrient utilization of Tilapia zillii (Gervais 1852) (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23363 | 19325 | 2018-04-08 17:59:50 | 23363 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: A feeding trial was conducted for 75 days to determine the effects of feed colours on nutrient utilization and growth in Tilapia zillii fingerlings. Four different food colourant \{Food Drug and Cosmetic (FD and C) colour red, blue, green and yellow\} was added to a basal diet 350g crude protein and 18.5MJ gross energy/kg diet and fed to T. zillii. There were five diets in all, the control (normal light brown commercial diet) (Diet 1), red-coloured diet (Diet 2), and blue-coloured diet( Diet 3), green-coloured diet(Diet 4) and yellow-coloured diet (Diet 5) and fed to triplicate groups of T. zillii at 4% body weight. Ten (10) T. zillii (14.00:t 0.003g) fingerlings were stocked in each concrete tank making a total of 150 fingerlings. The growth performance of the fish fed the yellow-coloured diet (Diet 5) had the best growth performance and nutrient utilization with Feed conversion ratio (FCR) and Specific growth rate (SGR) of 0.031:t0.80 and 1.17:t0.On respectively, this was followed by fish fed green-coloured diet, followed by fish fed red-coloured diet, followed by the fish fed the control diet (normal light brown commercial diet) and lastly, the fish fed blue-coloured diet had the least growth performance.
    Description: Includes:- 2 tables.;1 fig.;1 plate.;11 refs.
    Keywords: Aquaculture ; Tilapia zillii ; Nigeria ; freshwater environment ; Feeding experiments ; Experimental culture ; Feed efficiency ; Fish culture
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  • 19
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    Water parameters in Ilaje Local Government Area Ondo State (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23364 | 19325 | 2018-04-08 18:02:40 | 23364 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Ilaje Local Government Area of Ondo State is blessed with many rivers, lagoons, tributaries lakes and a very long coastline, of about 180km making the State as a coastal state with the longest coastline in Nigeria. The people are predominantly fishermen. The fish produced from this area could be further boosted through farming of fish especially in cages along the available creeks at not much cost to the inhabitants. This study shows that the waters of the area were found optimal for fish production. This further buttressed by the fact that the area has been an active zone of fish production for ages. This historical perspective is been considered as the baseline in the study for perpetuating the culture of fish and other aquaculture species in the area
    Description: Includes:- 7 refs.
    Keywords: Aquaculture ; Limnology ; Nigeria ; Ilaje ; freshwater environment ; Fish culture ; Cage culture
    Repository Name: AquaDocs
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    Challenges of fish farmers in Ondo State, Nigeria (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23384 | 19325 | 2018-04-10 16:48:49 | 23384 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: This study assessed fish farmers in Ondo State, south west agro-ecological zone of Nigeria using a sample size of 100 respondents, selected through a multi-stage sampling technique. Instrument for data collection was semi-structured questionnaire. Data were analysed using frequency counts and % of the respondents. Results showed that majority (52.0%) of the respondents are middle aged, 95.0% male, 93.0% married with a higher education (45.0%). The most important fisheries technology adopted by the farmers is disease control management. 67% indicated lack of finance and high cost of fish seed (58.0%) as the most important problems encountered. It was recommended that adequate incentive and grants should be given to farmers to finance fish production.
    Description: Includes:- 1 table.;1 fig.;11 refs.
    Keywords: Aquaculture ; Nigeria ; Ondo State ; freshwater environment ; Fish culture ; Freshwater aquaculture ; Sociological aspects ; Socioeconomic aspects
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  • 21
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    Control of reproduction in Oreochromis niloticus using pawpaw seed meal as reproduction inhibitor (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23408 | 19325 | 2018-04-12 09:01:23 | 23408 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Pawpaw (Carica papaya) seed meal (PSM) was added to a basal diet (350g crude protein and 18.5MJ gross energy lkg diet) at 0, 0.5, 1.0, 1.5 or 2.0 g/kg diets and fed to mixed-sex Oreochromis niloticus for 60 days to evaluate the effects on growth, feed conversion ratio, reproduction traits, and histology of gonads. There were no variations (P〉0.05) in growth parameters and feed conversion ratio. Indices of reproduction traits decreased with increasing dietary PSM levels. Fish fed with the basal diet had higher and better indices of reproduction traits (P〈0.05) than the fish fed with PSM diets. Fish fed O.0g PSMlkg diet showed normal testicular and ovarian tissues, and no lesions were observed. Fish fed O.5g PSMlkg diet showed slight increase in interstitial cells in testes. Fish fed 1.0g PSMlkg diet showed swollen spermatids nuclei, increased interstitial cells and focal necrosis in testes; and hydropic degeneration, ruptured follicles, granulomatous inflammation in the insterstitium and necrosis in ovaries. Fish fed 1.5g PSMlkg diet exhibited atrophy of seminiferous tubules in testes. Fish fed 2.0g PSMlkg diet, there was disintegration of spermatids and necrosis in testes and severe atretic follicles in ovaries. Reproduction traits and histological observations of gonads in O. niloticus fed high dietary PSM levels revealed that pawpaw seeds may be effective as a reproduction inhibitor in O. niloticus.
    Description: Includes:- 4 tables.;23 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; freshwater environment ; Feeding experiments ; Experimental culture ; Nutritional requirements ; Fish culture
    Repository Name: AquaDocs
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  • 22
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    Potentials of poultry offals in African catfish diets (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23407 | 19325 | 2018-04-12 09:00:06 | 23407 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: A 70-day feeding trial was conducted to test the effect of partial replacement of fishmeal by poultry offal in African catfish Clarias gariepinus diets. Four isonitrogenous ration containing various levels (0%, control), 30%, 60% and 90% of poultry offal were fed to three replicate groups of C.gariepinus fingerlings with a mean initial weight of 0.74~c 0.15 g. 10 fish/plastic bowl were tested in 15 I capacity plastic bowl. Mean weight gain of the fingerlings fed the control were higher (2.43~c 0.12g) compared to fish fed 30%, 60% and 90% poultry offal inclusion of Hsh meal (1.99~c 0.08g, 1.84~c0.06g and 1.14~c 0.20g, respectively), but there was no significance difference (P~〈 0.05) in weight gain of fish. There was no significant variation in feed conversion ratios which varied between 0.46~c 0.12 and 0.53~c 0.20 for the control and 90% poultry offal respectively, obtained among the groups. Similarly, specific growth rate and protein efficiency ratio decreased as the level of poultry offal increased in the diet. It was concluded that the replacement of fish meal with chicken offal meal diet at 30% level will enhance growth performance of Clarias gariepinus
    Description: Includes:-4 tables.;9 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Ibadan ; freshwater environment ; Feeding experiments ; Experimental culture ; Feed preparation ; Nutritional requirements ; Fish culture
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  • 23
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    Fertilization, hatchability, survival and larval biometry in interspecific and intergeneric hybrids of Clariid catfishes (2021)
    Fisheries Society of Nigeria | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23322 | 19325 | 2018-04-06 15:44:54 | 23322 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Interspecific and intergeneric hybridization studies were carried out in H. longifilis, C. gariepinus and C. anguillaris under controlled hatchery conditions to estimate their aquaculture potential in terms of fertilizability, hatchability and survival. Fertilization rate in all the nine genetic crosses ranges from 60-87.5%, the fertilization rates of the parentals being significantly higher(P〈0.05) with highest value of 87.5% obtained in C. gariepinus. The intergeneric hybrids had the lowest rate of fertilization. Hatchability ranges between 75- 88.1 %, with the parental C. anguillaris being slightly significantly higher than the other genetic combinations. C. anguillaris x H. longifilis I had the lowest hatchability and there was no significant difference (P〈0.05) in percent hatching among the the interspecific hybrids. The survival of all the nine genetic crosses from hatching up to the end of the two weeks indoor rearing period ranges between 78-89%, which wasn't significantly different among the interspecific and intergeneric hybrids. C. anguillaris and C. gariepinus had the highest percent survival which was significantly different from all the other mating combinations. The intergeneric hybrid larval had significantly greater (P〈0.05) length in comparison to the interspecific hybrids. H. longifilis and the hybrids produced from its eggs had greater body weight than that of C. gariepinus and C. anguillaris
    Description: Includes:- 2 tables.;25 refs.
    Keywords: Aquaculture ; Fisheries ; Heterobranchus longifilis ; Clarias anguillaris ; Clarias gariepinus ; Nigeria ; New Bussa ; freshwater environment ; Fish culture ; Hatching ; Survival ; Interspecific relationships ; Hybrids ; Hybridization
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    Effects of enclosure colour on growth performance of Clarias gariepinus fry (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23325 | 19325 | 2018-04-06 16:01:51 | 23325 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: The effect of five enclosure colour on the production of Clarias gariepinus fry at post- yolk absorption stage were examined in the indoor hatchery during the first phase of exogenous feeding. A total of 3600 C. gariepinus fry (mean weight, 6.3 ~c 0.00 mg) were stocked into 15,56 litres capacity laboratory plastic bowls. Tank colours evaluated were black, blue, green, white and maroon. Frys were fed on zooplankton ad-libitum. Results indicated that tank colour had significant impact (P〈0.05) on the weight of C. gariepinus fry. However, percentage survival was significantly higher (P 〈 0.05) in black (86.67 %) than in white and maroon (56.67% and 66.67 % respectively). Survival in the black tanks ( 86.67 %) was not significantly different ( P 〉 0.05) than the blue and green tanks treatments but was significantly higher ( P 〉 0.05) than the blue and green tanks treatments. Based on the results, it is obvious that the background enclosure colour has effects on the growth and survival of fry in the indoor rearing system. A general tendency of higher fry growth and survival in dark colour backgrounds was evident. This could have a significant financial impact on commercial fingerlings production of C. gariepinus as fish hatchery operators in Nigeria do not currently take into consideration the colour of tanks use for the rearing of fry in the indoor hatchery.
    Description: Includes:- 3 tables.;10refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; freshwater environment ; Fish culture ; Growth rate
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    Growth and production of fingerlings of Dutch Clarias gariepinus in indoor tanks in arid zone, Nigeria (2021)
    Fisheries Society of Nigeria | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23321 | 19325 | 2018-04-06 15:38:18 | 23321 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Study on the growth and percentage survival of seasonal induced breeding was carried out at the Federal College of Freshwater Fisheries Technology Baga. About 40,414 fingerlings were produced with percentage survival of 81.1 % at water temperature of 28degrees C between April and May, 2009. The average weight of fingerlings produced was 1.54 g with average standard and total length of 3.0 cm and 3.5 cm respectively. However, environmental factors that could hinder mass production of Dutch Clarias fry/fingerlings stocked at low and high stocking densities were monitored for eight weeks at 3.6 m2 indoor concrete tanks with water aeration using flow-through system. The percentage survival of 83.5% and 92.5% were obtained after the period of 8 weeks. The fry/fingerlings were fed with Artemia mixed with powdered feed of 35 % crude protein. The study shows that for Dutch Clarias fry/fingerlings production and management, smaller concrete tanks with flow-through mechanism are required and 3.6 m2 should not be stocked with more than 3,500 fingerlings per tank in the first 8 weeks before transferring them to production ponds. It was observed that apart from efficient water aeration, constant feeding and sampling of fingerlings will increase growth rate, increase resistance to disease and uniformity in size of the Dutch Clarias. The mean water temperature measured in this study ranged from 27.5degrees C in April and 28.5degrees C in May while pH ranged between 7.5 and 7.3 in April and May, respectively.
    Description: 4 tables.;8 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Baga ; freshwater environment ; Fish culture ; Freshwater aquaculture ; Pond culture ; Survival
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    A review of essential checklists for fish cage culture (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23329 | 19325 | 2018-04-06 16:07:55 | 23329 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Nigeria has potentials for high production of fish from her water bodies. Fishing is the predominant means of fish supply that needs to be increased by fish fanning in different enclosures. Cage aquaculture is possible in several existing water bodies. The essential inputs for a successful fish cage farming therefore need to be considered. This would be an added wealth creation for job seekers/farmers hitherto involved in traditional fishing.
    Description: Includes:- 14 refs.
    Keywords: Aquaculture ; Nigeria ; freshwater environment ; Cage culture ; Aquaculture techniques ; Cages ; Fish culture
    Repository Name: AquaDocs
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  • 27
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    Comparison of diploid and triploid Heterobranchus bidorsalis using Polyacryl Amide Gel Electrophoresis (N-PAGE) (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23409 | 19325 | 2018-04-12 09:02:51 | 23409 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: A comparative analysis on biochemistry and Polyacryl Amide Gel Electrophresis was carried out to determine the genetic diversity of diploid and triploid Heterobranchus bidorsalis. Sixteen samples of diploid and triploid farm-raised (mean weight; 512.6g and mean length; 41.6cm) were collected and the electrophoresis analysis was conducted using 5.5% Polyacryl Amide Gel and serum protein obtained from the blood of the live samples. 0.06% Coomassie blue was used for staining the gel while a mixture of ratio 1:2 of glacial acetic acid, meethanol and distilled water was used for de-staining the gel. The diploid and triploid possessed an equal total number of 23 electrophoretic protein bands. The molecular phylogenetics of both samples revealed low genetic variability. Results of this study will serve as a baseline analysis on the current genetic diversity of H. bidorsalis in Nigeria.
    Description: Includes:- 2 figs.;8 refs.
    Keywords: Fisheries ; Heterobranchus bidorsalis ; Nigeria ; Kontagora L. ; freshwater environment ; Genetics ; Diploids ; Experimental culture ; Nutritional requirements ; Fish
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    Collection and maturation of broodstock of the black tiger shrimp Penaeus monodon (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23391 | 19325 | 2018-04-12 07:12:03 | 23391 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Forty (40) broodstock of the black tiger shrimp, Penaeus. monodon, comprising of 16 males and 24 females were collected between November and December 2008 from three Nigerian Fishing Companies namely Karflex Fisheries Nigeria Limited, Honeywell Fisheries and ORC Nigeria Limited. The body weight ranged from 72.5 to 300g, total length from 24.0-34.0 cm and carapace length from 8.0-24.5cm. Abdominal length ranged from 10.3 - 16.0 cm, and telson length from 3.0-5.7cm. The stages of ovarian development ranged between 0 and 3.5 while the percentage of sperm carried by the females ranged from 0 to 100%. The broodstock were stocked in the maturation tanks in the Nigerian Institute for Oceanography and Marine Research shrimp hatchery and fed on squid to enhance gonadal development and maturation. Spawning of P. monodon was successfully carried out three times with an estimated production of one to two million nauplii at each spawning. Three hundred and twenty (320) post larvae (PL30) were stocked in concrete tanks for broodstock development. The post larvae have presently attained juvenile stage with average body weight of 16.01g. The availability of broodstock of P. monodon in Nigerian coastal waters will ensure successful hatchery production of post larvae for stocking of ponds leading to the development of shrimp farming.
    Description: Includes:- 2 figs.;21 refs.
    Keywords: Aquaculture ; Penaeus monodon ; Nigeria ; Lagos ; freshwater environment ; Fish culture ; Shrimp culture
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    Growth of two tilapias in floating plastic cages (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23403 | 19325 | 2018-04-12 08:53:33 | 23403 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: A growth trial of Oreochromis niloticus and Sarotherodon galilaeus fingerlings in floating plastic cages was carried out for 180 days. O. niloticus (mean wt., 75 ~C 0.50g) and S. galilaeus (mean wt., 36.40~c 1.80g) were stocked at 250 fish fingerlings/m3. The study was conducted in four 2x2xl m plastic cages with two replicate cages for each treatment. A 25% protein balanced diet was used as feed. The mean weight gain ranged from 0.33 to 0.91g/day while the mean final weight ranged from 60.0g to 162.00g for O. niloticus and S. galilaeus, respectively. Total fish production ranged from 15.90 to 16.00kg/m3. The highest survival (100%) was obtained in 0. niloticus while the lowest (98.4%) was obtained in S. galilaeus. The major constraint in the study was the inadequacy of suitable fingerlings size for stocking the plastic cages.
    Description: Includes:- 3 tables.;8 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Sarotherodon galilaeus ; Nigeria ; Kigera L. ; freshwater environment ; Fish culture ; Cage culture
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    Autonomous adaptation to climate change by shrimp and catfish farmers in Vietnam’s Mekong River delta (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/10545 | 115 | 2013-02-07 13:22:28 | 10545 | WorldFish Center
    Details
    Publication Date: 2021-06-26
    Description: The Mekong River delta of Vietnam supports a thriving aquaculture industry but is exposed to the impacts of climate change. In particular, sea level rise and attendant increased flooding (both coastal and riverine) and coastal salinity intrusion threaten the long-term viability of this important industry. This working paper summarizes an analysis of the economics of aquaculture adaptation in the delta, focusing on the grow-out of two exported aquaculture species—the freshwater striped catfish and the brackish-water tiger shrimp. The analysis was conducted for four pond-based production systems: catfish in the inland and coastal provinces and improved extensive and semi-intensive/intensive shrimp culture.
    Description: CGIAR research program on climate change
    Description: Agriculture and Food Security (CCAFS)
    Description: QUEST-Fish
    Keywords: Aquaculture ; Shrimp culture ; Fish culture ; Climate change ; Vietnam
    Repository Name: AquaDocs
    Type: monograph
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    Production of two highly abundant 2-methyl-branched fatty acids by blooms of the globally significant marine cyanobacteria Trichodesmium erythraeum (2021)
    American Chemical Society
    Details
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Gosselin, K. M., Nelson, R. K., Spivak, A. C., Sylva, S. P., Van Mooy, B. A. S., Aeppli, C., Sharpless, C. M., O’Neil, G. W., Arrington, E. C., Reddy, C. M., & Valentine, D. L. Production of two highly abundant 2-methyl-branched fatty acids by blooms of the globally significant marine cyanobacteria Trichodesmium erythraeum. ACS Omega, 6(35), (2021): 22803–22810, https://doi.org/10.1021/acsomega.1c03196.
    Description: The bloom-forming cyanobacteria Trichodesmium contribute up to 30% to the total fixed nitrogen in the global oceans and thereby drive substantial productivity. On an expedition in the Gulf of Mexico, we observed and sampled surface slicks, some of which included dense blooms of Trichodesmium erythraeum. These bloom samples contained abundant and atypical free fatty acids, identified here as 2-methyldecanoic acid and 2-methyldodecanoic acid. The high abundance and unusual branching pattern of these compounds suggest that they may play a specific role in this globally important organism.
    Description: This work was funded with grants from the National Science Foundation grants OCE-1333148, OCE-1333162, and OCE-1756254 and the Woods Hole Oceanographic Institution (IR&D). GCxGC analysis made possible by WHOI’s Investment in Science Fund.
    Keywords: Lipids ; Alkyls ; Bacteria ; Genetics ; Chromatography
    Repository Name: Woods Hole Open Access Server
    Type: Article
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