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  • Nigeria  (51)
  • Aerodynamics
  • Inorganic Chemistry
  • Life and Medical Sciences
  • Lagos, Nigeria  (51)
  • 2020-2022  (51)
  • 1950-1954
  • 1945-1949
  • 1
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    Capacity building and training requirement for effective fisheries and aquaculture extension in Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23216 | 19325 | 2018-03-17 12:51:36 | 23216 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: This paper examines the importance of capacity building and training requirement for the benefit of fisheries and aquaculture extension in Nigeria. It involves the analysis of secondary data bothering on the management of agricultural extension in Nigeria over time vis-avis various agricultural development programmes in the past in which fisheries and aquaculture extension was apparently de-emphasized in favour of crop and livestock agriculture. It is therefore recommended as a way forward that a favorable reform in the Nigerian agricultural extension system will be a necessary avenue to put fisheries and aquaculture extension in proper perspective for effective service delivery which will be a good entry point to achieving the millennium development goals of combating hunger, extreme poverty and attainment of food security in Nigeria.
    Description: Includes:-7 refs.
    Keywords: Aquaculture ; Fisheries ; Information Management ; Nigeria ; Extension services ; freshwater environment ; Technology transfer ; Training ; Education ; Sociological aspects
    Repository Name: AquaDocs
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    Format: 24 -34
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  • 2
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    Women in fisheries: a case study of the Kainji Lake Basin, Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23222 | 19325 | 2018-03-18 13:52:04 | 23222 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The study examined the contribution of women to fisheries in Kainji Lake Basin, Nigeria. The sample size of 80 respondents was selected through a purposive sampling in ten (10) fishing villages around Kainji Lake Basin. Instrument for data collection was semi- structured questionnaire. Data was analyzed using descriptive statistic. The result showed that the women are mostly engaged in processing, marketing and financing. About 60 percent of the women interviewed are engaged in marketing and financing. Ten (10) percent of the respondents are engaged in financing. The low participation in financing is attributed to high amount of capital involved. It is recommended that women should be made to benefit more from rural development policies and programmes.
    Description: Includes:- 2 tables.;1 fig.;7 refs.
    Keywords: Fisheries ; Sociology ; Nigeria ; Kainji L. ; freshwater environment ; Women ; Fisheries
    Repository Name: AquaDocs
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    Format: 66 - 71
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  • 3
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    Proximate composition and amino acids profile of smoked catfish Clarias gariepinus and tilapia Oreochromis niloticus (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23226 | 19325 | 2018-03-18 14:51:17 | 23226 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The proximate composition and amino acids assay of smoked Clarias gariepinus and Oreochromis niloticus were determined using standard procedures. The mean proximate composition of Oreochromis niloticus are 8.9% moisture, 16.00% lipids, 5.6% ash, 44.5% crude protein, 0.42% crude fiber and 24.9% NFE while Clarias gariepinus has 8.19% moisture, 15.55% lipids, 4.725 ash, 40.46% crude protein, 0.50% crude fiber and 30.58% NFE. There is therefore a nutrient variation between the 2 species of fish Oreochromis niloticus has higher crude protein, lipids, moisture and ash content than Clarias gariepinus.The amino acids profile shows that both fishes have 17 amino acids. Apart from Tryptophan, the following essential amino acids Histidine, Methionine, Threonine, Isoleucine, Leucine, Lysine, Valine and Phenylalanine are present in both fish. Oreochromis niloticus however has higher quantities of the essential amino acids except for Histidine than Clarias gariepinus
    Description: Includes:- 2 tables.;2 figs.;7 refs.
    Keywords: Chemistry ; Fisheries ; Clarias gariepinus ; Oreochromis niloticus ; Nigeria ; Kainji L. ; freshwater environment ; Amino acids ; Ash content ; Lipids ; Organic compounds ; Moisture ; Proteins
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  • 4
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    A comparative analysis of the food and feeding habits of African lungfish (Protopterus annectens, Owen) in River Rima and Goronyo Dam North Western Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23232 | 19325 | 2018-03-18 13:49:50 | 23232 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The food and feeding habits of Protopterus annectens of the River Rima and Goronyo Dam in North Western Nigeria was studied. A total of one hundred and eighteen (118) fish samples were collected from October, 2001 to September, 2002 and the stomach contents were analyzed using frequency of occurrence method. The feeding adaptation with respect to mouth and related structures, gill rakers and dentition were examined. The gut length and fish length indicated rectilinear positive relationship. The regression coefficient (b) and correlation coefficient (r) of GL TL relationships were highly significant (p〈0. 01). The main taxa of food substances found in the stomachs included substances of plant and animal origins, with overall frequency of 49. 1and 38.3% for the samples from River Rima and 27.2 and 60.3% for those from Goronyo Dam in the same order. The results of percentage occurrence of the food items in the dry season showed that animal substances in the juveniles (51.7%) and the adults (41.4%) were higher than the plant materials in the samples from the two water bodies. In the rainy season, the percentage occurrences of animal substances were higher in the adults (= 30cm) samples from Goronyo Dam than those samples from River Rima, while the same food items were absent in the juveniles (= 30cm) from the two water bodies. These feeding adaptive features indicate the roles of the species in their ecological niche and provide base line information that could be useful in satisfying their food requirement under culture condition. The diversity of food substances found in the stomach and their occurrence in the juveniles and adults varied with the water bodies and season.
    Description: Includes:- 5 tables.;19 refs.
    Keywords: Ecology ; Fisheries ; Protopterus annectens ; Nigeria ; Rima R. ; Nigeria ; Goronyo Dam ; freshwater environment ; Feeding behaviour ; Feeding ; Food chains ; Food preferences
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    Format: 128-135
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  • 5
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    An appraisal of the traditional fish handling and processing methods in Lake Chad (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23218 | 19325 | 2018-03-18 13:40:29 | 23218 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The paper reviews the various techniques of fish handling and processing in Lake Chad. Poor handling of fish catches on board coupled with the distant location of the fishing grounds and thick aquatic vegetation on the lake which hamper fast movement of catches to the processing centers are the bane of good quality fresh fish getting to the processors. The techniques adopted in processing and preservation are mainly smoking, char-burning and sun drying. Defects suffered by the processed products of the methods include high moisture content, heavy insect infestation, bacterial decomposition and fungal attack. Protection of catches from direct sunlight by spreading wet jutes over them will lower the rate of deterioration. Removal of the aquatic vegetation by appropriate authorities and canalization will ease movement of fish catches to the processing centers. More serious enlightenment of the processors on the adoption of the 'Chorkor' oven will reduce the problems presently facing cured fish. The use of rambo insecticide and other dangerous chemicals by the fish processors and marketers for the preservation of fish products before repackaging should be discouraged.
    Description: Includes:- 1 table.;43 refs.
    Keywords: Fisheries ; Nigeria ; freshwater environment ; Fish handling ; Handling ; Processing fishery products ; Curing
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  • 6
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    Design of double chine flat bottom fishing canoe for lake fishery (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23217 | 19325 | 2018-03-18 13:38:58 | 23217 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: A 7.0 meters Length Overall (LOA) flat bottom canoe similar to the one commonly used for fishing in Kainji lake, but with some modifications, was designed. The improvements/modifications over the local canoe include, an additional chine to reduce the flatness of the bottom which was absent in the local canoes commonly used. The canoe's light displacement (weight empty) was 0.48 Tonne, which was similar to local canoe of same size. The draft obtained was 0.13 M( 13cm), which is 36.9% of its depth (0.48 M). The capacity of the canoe was 1.304 tones. The water plane area (WPA) was 3.89 M2; WPA coefficient, and block coefficient were 0.83, and 0.82 respectively. The modification on the canoe resulted in provision of a canoe with the bottom shaped close to V-bottom to aid better performance on rough turbulent water such as the Kainji Lake, and increased life span of canoe and safety of fisher folk while aboard fishing.
    Description: Includes:- 1 table.;7 figs.;7 appendix
    Keywords: Fisheries ; Nigeria ; freshwater environment ; Boats ; Design ; Fishing vessels
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  • 7
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    Strengthening fisheries extension under the Unified Agricultural Extension System (UAES) policy towards sustainable fisheries development in Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23221 | 19325 | 2018-03-18 13:47:06 | 23221 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The paper examines the prospect and constraints of fisheries extension under the unification policy. It revealed certain barriers influencing its fullest utilization as well as fisher folks participation in extension programmes. Some of the barriers identified are related to inaccessibility, logistic support, improper aquaculture methodology, insufficient applied research in small scale fisheries, inability to convert research findings into positive results by small scale fisheries, inadequate number of fisheries research personnel within the existing research centers and institutes catering for the fishers sector, complexity of issues, lack of coordination and continuity in research and data deficiencies in small scale fisheries. Based on the findings, the paper recommends that, the effectiveness of the methods of identifying research needs by practitioners be assessed, the impact of the generated research results in reducing or solving field problems be ascertained, the constraints to diffusion of proven technologies from research being integrated into small scale fisheries be evaluated, the degree of effectiveness of extension delivery tools on .fishers technology adoption be ascertained, and lastly, adequate applied research in small scale fishery be emphasized.
    Description: Includes:-8 refs.
    Keywords: Fisheries ; Information Management ; Nigeria ; Extension services ; freshwater environment ; Technology transfer ; Education
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  • 8
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    Comparison of microbial load and proximate analysis of fresh lean fish Labeo coubie and fresh fatty fish Synodontis membranaceus with their smoked products (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23224 | 19325 | 2018-03-18 13:56:36 | 23224 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Comparative study on the microbial load and proximate composition of fresh lean fish Labeo cubie and fresh fatty fish Synodontis membranaceus with their smoked products were carried out. The colony count of different parts was carried out on all the samples and the results show the highest microbial load on the gut of both the fresh lean fish and the fresh fatty fish. The smoked dried lean fish and the smoked dry fatty fish had lower microbial counts compared to their fresh samples because smoking reduces the microbial load on fish. Biochemical characterization carried out on all isolates confirmed Gram-negative bacterial isolates. The proximate composition show that water is the most affected nutrient during the hot smoking of both the fresh fish sample and the fresh fatty sample with a corresponding increase in protein content. There was a significant difference (p〈 0.05) in proximate composition of smoked product of fresh fatty fish and the fresh lean fish. The colony counts of different parts of the fish reveals that majority of the microorganisms is found in the guts followed by gills and the lowest in the skin this is the pattern in the two fresh fish but for smoked fish the gut is usually removed before smoking.
    Description: Includes:- 4tables;9 refs.
    Keywords: Fisheries ; Labeo coubie ; Synodontis membranaceus ; Nigeria ; freshwater environment ; Microbial contamination ; Microbiological analysis ; Fishery products
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  • 9
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    Problems and prospects of fish culture in Mubi, Adamawa State (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23225 | 19325 | 2018-03-18 14:49:23 | 23225 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-13
    Description: This paper reviewed the major problems of fish pond culture in Mubi.The prospects for fish pond are highlighted and a call to awaken people initiatives in Mubi region to invest in fish farming is made so that the nutritional and economic status of the people of the region might be improved through aquaculture. Some of the problems identified are: lack of knowledge of the biology of culturable species, none availability of fish feed, none availability of fish seed and the peculiarity of the weather most expecially the very cold season when the temperature can be as low as 18~'C.
    Description: Includes:- 12 refs.
    Keywords: Aquaculture ; Nigeria ; Mubi ; freshwater environment ; Fish culture ; Freshwater aquaculture
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  • 10
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    Determination of intestine length to standard length ratio of some fishes from Ikpoba River and Ovia River, Nigeria with a review of culture of Parachanna obscura (Pisces:Channidae) (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23229 | 19325 | 2018-03-18 14:58:27 | 23229 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-13
    Description: The gut length to standard length ratios of twelve fish species from the Ovia and Ikpoba Rivers were calculated to work out their feeding level in the food chain. The mean ratio of five species Brycinus macrolepidotus Smith, 0.9 Parachanna obscura (Gunther), 1.0, Papyrocranus afer. Gunthel; 0.35, and Xenomystus nigri Gunther 0.75, classify them as carnivores. Four species Synodontis eupterus Boulenger; 4.4 S.schall (Bloch and Schneider) 4.8, Tilapia mariae Boulenger, 3.5, and T. tilli (Gervais), 4.7, are herbivores. Three intermediate ratio species B. longipinnis (Gunther), 1.3,Chrysichthys furcatus (Gunther) 1.6, and Clenopoma kingsleyae Gunther, 1.8, are omnivores. The body depth of seven of the species was measured and expressed as percentage of the standard length to ascertain the accommodative capacity of the fish for the gut. In addition a review of culture of snake head fish Parachanna obscura is presented.
    Description: Includes:- 3 tables.;18 refs.
    Keywords: Aquaculture ; Ecology ; Parachanna obscura ; Nigeria ; Ikpoba R. ; Nigeria ; Ovia R. ; freshwater environment ; Fishery biology ; Length ; Ratios
    Repository Name: AquaDocs
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  • 11
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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
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    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
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    Format: 113-119
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  • 12
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    Analysis of containers used by fishermen at Lake Alau community in Konduga Local Government Area of Borno State, Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23238 | 19325 | 2018-03-18 15:18:15 | 23238 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-13
    Description: Good handling of fish from the point of harvest to consumption is very essential and the quality of fish can only be maintained if only suitable containers are used in its processing, transportation, distribution and marketing. This study analyzed the different containers used by fishermen at lake Alau community in Konduga Local Government Area of Bomo State. The study was carried out in two prominent leading sites of lake Alau community which are kachalari and Abbari with the aid of questionnaires interview conducted with 50 randomly selected respondents fishermen. Both primary and secondary data were collected. The collected data were analyzed using the market cost of the various fish containers. The result shows that fish containers such as Metal basin, sacks, flat sacks and Metal trays have strong strength while Baskets, jerry cans and calabash have moderate strength the polythene bags, stationery and news print are very weak. Also baskets have the highest percentage of usage 20% while flat sacks, polythene bags and stationery have the highest percentage of 4%, which are the lowest. It can be concluded that, the different containers are afforded to fishermen but most of the containers are often kept dirty, which lead to poor hygiene, rough handling and invariably post-harvest losses and shortage in food supply. It can be recommended that, sheds should be provided at the landing sites to protect fresh fish the direct heat of the sun and enlightment of fishermen and traders on the minimum standard o fthe quality and hygiene for fish and fishery products.
    Description: Includes:- 4 tables;6 refs.
    Keywords: Fisheries ; Management ; Nigeria ; Alau L. ; freshwater environment ; Containers ; Fishery products
    Repository Name: AquaDocs
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    Format: 179 - 183
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  • 13
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    The genetic characteristics of cephalic abnormality and its aquaculture implication in Clarias gariepinus (Burchell 1822) (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23241 | 19325 | 2018-03-18 15:26:11 | 23241 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-13
    Description: Cephalic abnormality in nine mating groups involving Clarias gariepinus with cephalic abnormality, non Cephalic and Maiduguri origin were investigated to determine the level and the genetic basis of the occurrences and its aquaculture implication. The highest mean percentage survival in a Cephalic crossed with non cephalic group was 68.6% whereas the last mean percentage survival was 25.7% in the group of Maiduguri cross with Maiduguri parent. Cephalic abnormality was observed in the crosses with both female and male cephalic with a total frequency ranging from 0 % to 70.8. %. The least number of cephalic abnormality was 18.5% which involved a cross of non cephalic with cephalic, and the highest was 70.8%. This level of cephalic abnormality shows that the defect was hereditary. This result implies that, the genetic factor is a major contributor in the feature of cephalic abnormality in Clarias gariepinus.
    Description: Includes:-1 table.;3 appendixes.;11 refs.
    Keywords: Aquaculture ; Fisheries ; Clarias gariepinus ; Nigeria ; freshwater environment ; Diseases ; Deformation ; Fish culture ; Genetics ; Abnormalities ; Genetic abnormalities
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  • 14
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    Bacteriological quality of water and fish samples from Kainji Lake and the effect of animal and human activities (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23242 | 19325 | 2018-03-25 12:34:41 | 23242 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-13
    Description: Kainji Lake is a man-made Lake and is impounded in 1968 to generate hydroelectric power. The Lake also offers opportunities for developmental projects like Fisheries and Irrigation. Lake Kainji receives organic waste through husbandry operations in which the cattle defecate into and around the bank of the Lake. Other sources of pollution include runoff from farms, bathing and washings in the Lake. Surrounding villages e.g. Tarda and Musawa used the Lake as source of raw drinking water and also for other domestic purposes. Bacteriological quality of fish and water from the Lake is carried out as well as that of cow dung by using primary isolation media and biochemical analysis. Physico-chemical parameters of water from the Lake is also determined. Total viable bacteria count and total coliform count of the water range from 3.4 x 104 to 03.8x 106 Cfu/ml and 1.4 x 103to 2.1 x 105Cfu/ml respectively. Cow dung has total coliform count of 6.9 x 105 while fish gills has total coliform count of 1.6x103cfu/g. Bacteria species such as Escherichia coli, Salmonella typhi, Aeromanas hydrophila, and shigella species were found in the water body. Escherichia coli, Aeromonas hydrophila, and Salmonella species were found in the fish samples. Escherichia coli, Aeromonas hydrophila, Shigella species and Salmonella species were isolated from cow dung. Physicochemical Parameters such as DO, BOD and N03-N range from 4. 7 to 5.2mg/l, 0.2 to 0.9mg/1 and 7.0 to 9.3 mg/l respectively. This result shows that Kainji Lake is an intermediately polluted water. It is therefore necessary that cow dung used for fertilization of fish ponds should be screened for pathogens before use. It is also recommended that pollution of surface water bodies through human activities should be discourage by legislation on water pollution.
    Description: Includes:- 6 tables.;14 refs.
    Keywords: Biology ; Fisheries ; Pollution ; Nigeria ; Kainji L. ; freshwater environment ; Bacteriology ; Water quality ; Environmental effects ; Pollution
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  • 15
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    Socio-economic factors influencing aquaculture development in Sokoto State (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23243 | 19325 | 2018-03-25 12:36:45 | 23243 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-13
    Description: The study was carried out in five local Government Areas namely Sokoto North, Bodinga, Kware, Ilila and Tambuwal mapped out by International Fund for Agricultural Development as fishery potential areas. Seven villages namely Gidan Igwai, Kaurar Kwasau, Gidan Akwara, Tozai, Tambuwal, Mogajin Gari, and Badau also were selected all at random. Fish farm management questionnaire was used for data collection. Results revealed that adequate fish farm facilities, fish seed supply, private sector confidence and support, risk consderation, government support and investment, over popularized livestock poultry sub sector and fishery extension service are the problems of fish farming. Recommendations were made as to how to improve fish farming in Sokoto State.
    Description: Includes:- 17 refs.
    Keywords: Aquaculture ; Sociology ; Nigeria ; Sokoto State ; freshwater environment ; Socioeconomic aspects ; Aquaculture ; Aquaculture development
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  • 16
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    Elemental concentration and size relationship in African cuttlefish Sepia bertheloti, from the coastal waters of Qua Iboe River, Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23249 | 19325 | 2018-03-25 14:29:19 | 23249 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-13
    Description: Ten specimens of African cuttlefish, Sepia bertheloti, from the coastal waters off Qua Iboe River, Southeast Nigeria, were analyzed for the relationship between the concentration of the elements and the size of the species. Energy Dispersive X-ray fluorescence technique was employed to determine the elemental composition of the species. Eleven elements were identified in the body of cuttlefish. These were Chlorine, Strontium, Potassium, Calcium, Bromine, Iron, Copper, Zinc, Manganese, Nickel and Selenium of these elements, the concentration of calcium, potassium. Copper and strontium had a positive correlation with the weight, while the concentrations of manganese, nickel, chlorine, iron were negatively correlated with their weights. However, only manganese had a significantly negative correlation (p〈0. 05). Bromine and zinc had no correlation with the weights of the species. There also existed a significant positive correlation between Ca and K, Se and Ni, Cu, Br and Zn and St and K. We conclude that African cuttlefish, irrespective of size is a rich source of nutritional elements and is especially recommended for pregnant women and for all age groups.
    Description: Includes:- 2 figs.;9 refs.
    Keywords: Fisheries ; Sepia bertheloti ; ASE ; Nigeria ; Gulf of Guinea ; Nigeria ; Qua Iboe R. ; freshwater environment ; marine environment ; Nutritional requirements ; Potassium ; Nutrition
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  • 17
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    Women participation in fisheries in some fishing communities in Sokoto, Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23246 | 19325 | 2018-03-25 12:43:59 | 23246 | Fisheries Society of Nigeria
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    Publication Date: 2021-07-13
    Description: This study set out to investigate the participation of women in fisheries in some fishing communities in Wamakko Local Government Area of Sokoto state. It succeeded in establishing the fact that women are active though to some extent in fisheries in this area. This is as a result of the prevailing socio-cultural, as well as religious set up which revolves round task sharing. It however highlighted the fact that women's contribution in the fisheries sub-sector is necessary to improve their livelihood and by so doing, to directly help households.
    Description: Includes:- 8 refs.
    Keywords: Fisheries ; Sociology ; Nigeria ; Sokoto ; freshwater environment ; Women ; Fisheries ; Fishery resources
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  • 18
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    Acute toxicity and behavioural effects of chlorpyrifosethyl pesticide to juveniles of Clarias gariepinus Teugels (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23253 | 19325 | 2018-03-25 14:37:19 | 23253 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Chlorpyrifos-ethyl with its mode of action was evaluated in laboratory studies to determine its 96-h acute toxicity, using juveniles of Clarias gariepinus. The fish was exposed in glass aquaria to 0.64~cmg/l, 0.80mg/l, 0.96mg/l, 1.12mg/1 and 1. 28mg/1. The test substance was found to have lethal effects on fish as they changed fish behaviour and caused death. The 96-hLC50 value for C. gariepinus was estimated as 0.92mgl-1. Observations of be bavioural and mophlogical responses were used as indicators of sublethal toxicity. The behavioural toxicology bioassay may be valuable in comparing and predicting the mode of action of new or unknown toxicants in this and other fish species.
    Description: Includes:- 1 table.;1 fig.;2 plates.;38 refs
    Keywords: Fisheries ; Pollution ; Clarias gariepinus ; Nigeria ; freshwater environment ; Toxicity ; Toxicants ; Pollution ; Lethal effects
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  • 19
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    Indigenous knowledge system in fisheries: a review (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23260 | 19325 | 2018-03-25 14:50:35 | 23260 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Scientists and researchers agree that developmental projects should have impact on the targeted groups. In this context a review was made on the indigenous knowledge system in fishery with a view to elucidating the indispensability of the system due to the increasing acceptance globally. The importance of the system and the factors militating against it where shown. The relationship between fisheries science and the fisher's knowledge was also discussed. Some indigenous practices as well as equipment used by different people were cited. It was concluded that local knowledge of the environment and resources used, as well as the society within which the resultant goods and benefits are distributed is fundamental to the continuity of sound community based management practices. Recommendation was made for research to be conducted in every facet of fishery traditional system with a view to fusing the two; the indigenous and scientific to complement each another.
    Description: Includes:- 23 refs.
    Keywords: Fisheries ; Information Management ; Nigeria ; Information Sources ; Indigenous knowledge ; freshwater environment ; Fishery management ; Stock assessment
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    Study on the effect of two construction materials on the efficiency of fisheries aggregating devices (FADs) in Lake Kainji Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23259 | 19325 | 2018-03-25 14:49:05 | 23259 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Fish Aggregating Devices (FADs) were experimented in Lake Kainji using worn out automobile lyres and cement blocks for a period of 12 weeks. Six tyres and blocks were tied together separately in 3 replicates and randomly suspended in the lake at a depth of 2 metre and 50 meter interval. After 8 weeks of suspension, a fleet of gillnets with 76mm mesh size and hung at E-value 0.5 were zigzag set across the suspended FADs for 12 fishing periods with 13 hrs soak time (~c1.0268.D.) per period The trial showed that the cement block FADs attracted more fish (70% of the total fish caught) belonging to 6 different species. The lyres FADs attracted only 3 species of fish constituting some 30% of the total fish caught Citharinus citharus dominated the catch of the block FADs constituting 52.3% of the total catch, while Oreochromis niloticus was 46.4% of the tyre FADs. The Horizontal Enhanced Fishing Zone (EFZ) was found to be between 5 to 12 metres from the location of the FADs. There was significant different (P〈0.05) in the catches of the two FADs.
    Description: Includes:-14 refs,;1 table,;3 figs.
    Keywords: Fisheries ; Nigeria ; Kainji L. ; freshwater environment ; Fishing gear ; Gear construction ; Gear materials ; Gear research
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  • 21
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    Some soil nutrient composition favouring the growth of Typha grass in Kebbi and Katsina States, Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23276 | 19325 | 2018-03-28 15:48:40 | 23276 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: This study was carried out by surveying all the water bodies of two states where Typha grass exists. Soil auger was used to take soil samples randomly from five different locations in both Kebbi and Katsina state at the depths of 0-5cm, 510cm, 10 15cm. Soil nutrient was analyzed for the mineral composition of the two States at different season and soil depths. The result showed that, soil depth between 5-10cm has the highest percentage of nitrogen, phosphorus, calcium and magnesium during dry season. The nutrient composition of soil from the two states followed the same pattern during wet season.
    Description: Includes:- 4 figs.;9 refs.
    Keywords: Earth Sciences ; Ecology ; Nigeria ; Kebbi State ; Nigeria ; Katsina State ; Soil nutrient ; freshwater environment ; Soils ; Nutrients (mineral) ; Growth ; Aquatic plants
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  • 22
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    Use of baobab pulp as a source of vitamin C in the diet of Nile tilapia, Oreochromis niloticus fingerlings (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23277 | 19325 | 2018-03-28 15:50:01 | 23277 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Sixteen (16) weeks feeding trial in a randomized design with three replicates was conducted to study the response of 180 Oreochromis niloticus fingerlings to baobab pulp as a source of vitamin C. They were fed a basal diet without supplemental vitamin C in the first 2 weeks of conditioning to deplete some stored acrobate. Diets supplemented with 1008 mgascorbyl-2-monophosphate Mg2+ (AMP) kg-1 diet (diet 1); 84g baobab pulp kg-1 (diet 2) and 168g baobab pulp kg"1 diet (diet 3) were evaluated. There was no significant difference (P〉0.05) in terms of weight gain, feed efficiency ratio, protein efficiency ratio, specific growth rate and survival between the groups fed diets 1 and 3. There was a significant difference between the groups fed diet 2 and either of the other diets. Total ascorbate concentration of the liver was significantly (P〈0.05) higher in the groups fed diet 3. The crude protein content of the final fish was significantly (P〈0. 05) higher in the groups fed diet supplemented with AMP. Interestingly none of the groups exhibited the characteristic symptoms of vitamin C deficiency. The results of this experiment suggest that Oreochromis niloticus was able to obtain vitamin C from the baobab pulp and tend to recommend baobab pulp at a level not less than 168g kg-1 diet in the nutrition of Oreochromis niloticus based on the condition of this study.
    Description: Includes:- 3 tables.;1 fig.;19 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; freshwater environment ; Vitamin C ; Diets ; Feeding experiments
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  • 23
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    Effect of baits on the efficiency of Malian traps in Lake Kainji (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23278 | 19325 | 2018-03-28 15:52:01 | 23278 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Studies on the effects of two fishing baits on the catch composition of Malian Traps in Lake Kainji were monitored. The Traps were set at Monia fishing village in the southern basin of the Lake Baited with boiled yam (Dioscorea rotundata) and fresh palm fruit (Elaeis guineensis) and were inspected twice daily for seven weeks. The fishes caught comprised of nine (9) species belonging to four (4) families. The result of analysis of variance of the biomass as well as number and percentages of fishes caught in the traps by the baits showed there was no significant difference (P〉0.05). However, both baits showed better efficiency for Tilapia zilli, Oreochromis niloticus and Hemichromis fasciatus than other species caught but trap baited with fresh palm fruit had better efficiency for Distichodus restratus and Alestes nurse. There was wide range between the minimum and the maximum size of species caught, which showed the efficiency of the traps capturing small size, juveniles and the adult of large fish species due to small mesh size (1'') net cover of the trap. Recommendations were made for better performance and profitable fishing of Malian traps.
    Description: Includes:- 4 tables.;11 refs.
    Keywords: Fisheries ; Nigeria ; Kainji L. ; Malian trap ; freshwater environment ; Fishing ; Bait ; Trap fishing
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    Carbohydrate utilization of Oreochromis niloticus (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23279 | 19325 | 2018-03-28 15:53:18 | 23279 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Oreochromis niloticus of mean weight 45.96~c0.06g were fed seven practical diets ranging from 8.77 to 33.77% carbohydrate in 56 days. Mean weight gain were not significantly different (P〉0.05) while mean daily gain and specific growth rate varied significantly (P〈0.05). The protein efficiency ratio did not follow any trend with the percentage protein fed. It was highest with fish fed 46.3% and lowest with fish fed 51.2%. There was no significant variation in the food conversion ratio. The results indicated that O. niloticus utilized 25.28% carbohydrate optimally among the diets fed. The requirement of the fish for carbohydrate in diet is 30%.
    Description: Includes:- 3 tables.;2 figs.;19 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; freshwater environment ; Feeding experiments ; Nutrition ; Carbohydrates
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  • 25
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    Optimum temperature and stocking density for transportation of tilapia (Oreochromis niloticus) broodstock in the semi-arid zone of Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23280 | 19325 | 2018-03-28 15:54:31 | 23280 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Oreochromis niloticus broodstock of mean weight 32.3g were cropped in the morning with dragnet from a 1 ha reservoir and transported in round tanks to the Hatchery complex of the National Institute for Freshwater Fisheries Research where they were stocked into 5m x 5m indoor concrete tanks filled with clean water and with aerators at a density of 4 fish/m1. They were acclimated for 5 days and then packaged into 60 liter capacity water proof bags at the following stocking densities: 60, 80, 100, 120, 140 fish/60 lit bag. Each stocking density had bags with ice blocks and bags without ice blocks in triplicate. The water proof bags were oxygenated, loaded into quick fitting plastic bowls and transported in a bus from New Bussa to Warra, Kebbi state, a journey of 3 hours. The trip was repeated four times. Percentage survival in bags with ice block were 100%for stocking densities 60, 80, 100 fish/60 lit bag, 95.1%for 120 fish/60 lit bag and 84. 7%for 1-10 fish/60 lit bag (mean temperature 23.5~?C). Mortalities were recorded in all the bags without ice block but the highest survival was in the bag with stocking density 60fish/60 lit bag (mean temperature 29.2~?C).
    Description: includes:- 3 tables.;6 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; freshwater environment ; Stocking density ; Transportation ; Fish culture
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    Fisheries and ecotourism: a tool for national development (2021)
    Fisheries Society of Nigeria | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23004 | 19325 | 2018-03-05 09:27:38 | 23004 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-12
    Description: The paper which is a key note address, examined the concept of the United Nations Conference on Environment and Development (UNCED) held in Rio de Janeiro (Brazil), June 1992 as it relates to fisheries and land based tourism. The significance of fisheries to the world economy and the trends in global fisheries production are highlighted. The world production is put at 130.8 million tonnes, while production in Nigeria is put at 408.9 tonnes. The relationship between fisheries and ecotourism are discussed. Advantages in co-developiong fisheries and ecotourism are highligthed.
    Description: Includes:- 6 tables.;5 figs.;11 refs.
    Keywords: Conservation ; Fisheries ; Nigeria ; Ecotourism ; freshwater environment ; marine environment ; Fishery management ; Marine parks ; Sanctuaries ; Tourism ; Recreation ; Conservation ; Fishery development ; Nature conservation
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    Preliminary investigations of Njuwa Lake, Adamawa State, for fish production enhancement and resuscitation of Njuwa annual cultural fishing festival (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23228 | 19325 | 2018-03-18 14:56:29 | 23228 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Lake Njuwa has a historical and cultural heritage and has been a veritable source of livelihood to the people of Yola town on the South-western side, and Rugange village on the North-eastern side of the lake. Many Rivers and streams flow into the Lake. From the South Western side River Chouchi and Mayo Chudde; from the South Eastern side by numerous streams such as Mayel Lumo, Mayel Kalwa, Mandare streams and many other small streams (about five) drain into Njuwa Lake. The major contributor to the Lake is a "neck" in the North Eastern side of the Lake which emanates from Benue River. When River Benue is full especially when Lagdo spill gates are open in September, the neck allows water from the back-flow of Benue to enter the Lake and with it comes the recruitment of the Lake's fish species diversity Preliminary investigation revealed that Njuwa Lake despite its numerous environmental problems which sometimes leads to its complete drying, has very ideal limnological parameters for fish production. Njuwa was reported to be 17.5km2 (17500m2) before the construction of Lagdo dam on River Benue on the Nigeria-Cameroon boarder by the Cameroonian Authorities and the numerous irrigation projects around the Lake and River Benue. As at December 1981 however, aerial photos showed that it had shrunk to 3.5 km (3,500m2). As at November 2004, it has completely dried up. It was reported that cars could actually drive through on the dry bed of the Lake. The average depth of the Lake is around 0.5 meters and the water is very turbid. Farming around the Lake has triggered a higher level of deposit into the flood water which serves as silting material for the Lake. This is in addition to farm chemicals run off from the rain fed and irrigated crop, increasing the nutrient supply to lake's water thereby leading to accelerated eutrophication with it adverse consequences. Fish species diversity is also very high from on site report. Therefore the lake offers a unique potential for both artisanal fishing and fisheries tourism through the resuscitation of the cultural fishing festival despite the environmental degradation that it has suffered over the years. In view of the great prospects of the Njuwa Lake basin, if properly developed for its multidimensional benefits to the local economy in tourism job creation, food security, livelihood diversity and environmental improvement, the development of the lake basin on a holistic basis is highly recommended. The process should capture and involve the interest of all stakeholders around the Lake.
    Description: Includes:- 1 table.;1 fig.
    Keywords: Fisheries ; Limnology ; Nigeria ; Njuwa L. ; freshwater environment ; Fishery development ; Water conservation ; Fishery management
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    Food and feeding habit of freshwater Mormyrid (Hyperopisus bebe occidentalis, Gunther) in River Rima and Goronyo Dam, Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23231 | 19325 | 2018-03-18 15:06:24 | 23231 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The food and feeding habits of Hyperopisus bebe occidentalis caught in River Rima and Goronyo Dam in North western Nigeria were investigated A total of four hundred and fifty four (454) fish samples were collected on monthly basis from October, 2001 to September, 2002 are examined for feeding adaptations and gizzard content. The mouth is terminal in studied species. Two types of teeth were identified viz; cardiform and molariform. The gill rakers were 0.09~c 0.04cm in length with 0.010~ccm interspacing. The compartment of gut included gizzard-like stomach. The gut length and fish length (GL-TL) indicated rectilinear positive relationship. The regression coefficient (b) and correlation coefficient (r) of the gut length fish length relationships were significant (p〈 0.05). The main taxa of food items identified included substances of plant and animal origins, with overall percentage occurrence of 69.8 and 20.7% for samples from River Rima and 59.1 and 20. 0% for those from Goronyo Dam in the same order. During the dry season, the frequency occurrence of plant substances were higher in the juveniles (〈30cm, TL) 70.9% and adults (=30cm, TL) 64.7% in River Rima than the values obtained in samples from Goronyo Dam. Their occurrences in Goronyo Dam were fairly higher in the adults (62.9%) than in the juveniles (53.6%) during the same season. The results of this study showed higher occurrence of plant materials in juveniles than in the adults from the two water bodies during the rainy season. Contrary to this, low frequency occurrence of substances of animal in the juvenile samples from River Rima (15.2%) and Goronyo Dam (17.1%) were obtained in adult samples, the occurrence of animal substances were more than those of plants from the two seasons and water body. The feeding adaptive features revealed the ecological roles of the fish species that could be useful in satisfying their food requirements in culture systems and for teaching and further research.
    Description: Includes:- 5 tables.;19 refs.
    Keywords: Ecology ; Fisheries ; Hyperopisus bebe occidentalis ; Nigeria ; Rim R. ; Nigeria ; Goronyo Dam ; freshwater environment ; Feeding behaviour ; Feeding ; Food preferences
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    Production rate of nitrogen compounds and other water quality variables in tank cultured Macrobrachium vollenhovenii (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23239 | 19325 | 2018-03-18 15:20:10 | 23239 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Juveniles Macrobrachium vollenhovenii prawns were collected from Epe lagoon and reared for 56 days in concrete tanks with purely freshwater. Production rate of Nitrogenous compounds were monitored. Analysis of the water quality variables were carried out weekly and the range of each parameters were 6.74 7.90 (pH), temperature ranged between 25.7 and 30.3~?C, 6.71 8.01 mg/L for dissolved oxygen, 0.00 0.03% for Salinity, 0.199 0.725 mS/cm for conductivity, 24 48 NTU for turbidity), nitrite ranged from 0.07 to 0.50mgIL, nitrate was 1.32 6.63mgIL, and 0.32 1.65mgIL was recorded for ammonia.
    Description: Includes:- 2 tables.;2 figs.;1 plate.;12 refs.
    Keywords: Aquaculture ; Biology ; Macrobrachium vollenhovenii ; ASE ; Nigeria ; Epe Lagoon ; marine environment ; Chemical compounds ; Ammonia ; Nitrates ; Salinity ; Shrimp fisheries ; Lagoon fisheries
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    Effect of using plant - Rosa-sinensis' extracts and Methyltestosterone in a fry diet for Oreochromis niloticus (L.)'s growth, survival and sex ratio (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23240 | 19325 | 2018-03-18 15:22:14 | 23240 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The effectiveness of plant extracts (PE) and Methyltestosterone (MI) for male production and growth promotion in Oreochromis niloticus were studied in concrete tanks for 60 days. Fry were fed at two feeding levels, initially 20% and later 10% of body weight dally with diet treated with 60mg/kg. Tilapia treated with MT for 60 days attained an average weight of 10.13~c1.32g, those treated with PE attained an average weight of 11.15~c0.55g compared to 6.95~c0.32g for untreated (control) fish reared under similar conditions. The percentage of males among the untreated tilapia was 39.28%, 68.75% for PE fed tilapia, more than 88.88% of the tilapia in MT treatment group were male. The experiments demonstrated that the anabolic and sex reversal effects of MT on tilapia are proportional to the duration of treatment and quantity of hormone administered Histological sections of the testes of fry fed MT and P E diets showed deformed, clustered, swollen nuclei. Higher concentrations of MT and PE can be used to control prolific breeding and increase yield in fish production.
    Description: Includes:- 4 tables.;2 figs.;11 plates.;20 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; Rosa-sinensis ; Methyltestosterone ; freshwater environment ; Feeding experiments ; Fish culture ; Diets ; Aquatic plants ; Histology
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    Potentials of some medicinal plants as fertility enhancing agents in fish (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23236 | 19325 | 2018-03-18 15:14:46 | 23236 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The potentials of some medicinal plants that enhance fertility in animals were highlighted. Though, these medicinal plants can be used for other purposes but this paper focused on the fertility potential of the plants on animals. Some of the plants such as date palm (Phoenix dactylifera), wild yam (Discorea villosa) and Focus capensis had been discovered to enhance fertility in rats, monkey and poultry. Therefore if these medicinal plants could work on rats and poultry for fertility enhancement, the plants could as well be tried on fish so as to enhance the fecundity and sperm production in female and male brooders which will eventually lead to increase in fish seeds production. However, research is on going on the use of some medicinal plants to enhance fecundity and sperm production in male and female brooders in order to increase fingerlings production which would subsequently lead to increase in fish production.
    Description: Includes:- 1 table.;12 plates.;22 refs.
    Keywords: Aquaculture ; Fisheries ; Nigeria ; freshwater environment ; Fertility ; Aquatic plants
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    Socio-cultural impact of tourism in Nigeria: a case study of fisheries development in Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23244 | 19325 | 2018-03-25 12:38:25 | 23244 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Socio-cultural impact of tourism has become a veritable tool for fisheries development in Nigeria. Little wonders that Nigeria who has a great potential in tourism and rich cultural heritage and notable festivals attracts tourist not only in Nigeria but other parts of the World are not fully explored. Among many other popular festivals is the Niger Delta holds the Ikwere, Kalabari and Obirika festivals, to celebrate the water head dress that imitate the heads of fish or water birds. Many communities, including those in north, have a version of the harvest festival. Also in the north, the Argungu fishing festival occasion takes place in Argungu, in Birnin Kebbi State, during February and dates back to the 16th century. During the festival, hundreds of local men and boys enter the water armed with large fish net scoops, and the competition is to catch the biggest fish. With a population of almost 140 million people comprising of over 250 ethnic groups, Nigeria is a blend of exciting socio-cultural diversity that has produced a land of un parallel opportunities for fisheries development.
    Description: Includes:- 11 refs.
    Keywords: Fisheries ; Law ; Sociology ; Nigeria ; freshwater environment ; Sociological aspects ; Tourism ; Fishing ; Recreation
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    A review of length-weight relationship and its parameters in aquatic species (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23248 | 19325 | 2018-03-25 12:51:59 | 23248 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Length weight relationship and its parameters are requiring in practical assessment of stocks of aquatic species. The exponent b describes the growth condition of the species in question. If the value of b is 3 around 3, the fish is said to exhibit isometric growth if the value of b is less or greater than 3 the species is said to exhibit isometric growth if the value of b is less or greater than 3 the species as exhibiting both isometric and allometric conditions. Such conclusions are erroneous and misrepresentation of scientific facts. They stem from the use of inappropriate methods in estimation of the LW parameters and the authors? lack of understanding of the biological theory behind the growth conditions. To correct these erroneous presentations, the paper highlights the appropriate approach for the estimation of the LWR parameter. Large sample size. Wide size range and appropriate statistical tools are essential ingredients for accurate estimation of the LW parameters. The paper also elucidates on the concept of isometric and allometric growth in fishes and other invertebrates. A minimum of one year time scale of data collection in order to capture all the size ranges, from the young of the year to the oldest individual in the population, so as to reflect the ontogenetic growth performance of the aquatic species, have been proposed
    Description: Includes:- 4 tables.;15 refs.
    Keywords: Ecology ; Fisheries ; Ethmalosa fimbriata ; Cirrhinus reba ; Rhinomugil corsula ; Micropogonias furnieri ; Nigeria ; freshwater environment ; Length ; Length-weight relationships ; Body size ; Body weight ; Growth
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    Occurrence and dissolution of rigor-mortis in Bagrus bayad macropterus and Mormyrus rume from River Rima Sokoto (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23251 | 19325 | 2018-03-25 14:33:27 | 23251 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: A total of eighty nine samples comprising 45 B. bayad and 44 M.rume from River. Rima were subjected to evaluation of rigor-mortis occurrence and dissolution; Total weight and total length of the species were measured using electric top loading balance (16000gm) and measuring board, respectively. Stop watch and calibrated thermometer were used for recording time and temperature to determine rigor mortis duration and temperature effect. The results showed that the duration from capture to dissolution of rigor was higher in M.rume than B. bayad, despite the fact that temperature ranges were similar. Factors such as size distribution and level of exhaustion might have contributed to the variations. In the light of the above, it is recommended that factors resulting to rapid exhaustion of B. bayad be looked into with a view to lowering it and subsequent elongation of the rigor period.
    Description: Includes:- 2 tables.;10 refs.
    Keywords: Fisheries ; Bagrus bayad macropterus ; Mormyrus rume ; Nigeria ; freshwater environment ; Fish spoilage ; Quality control
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    Influence of dietary palm oil on growth and carcass composition of Heterobranchus longifilis (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23250 | 19325 | 2018-03-25 14:30:49 | 23250 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Supplies of marine fish oil (FO) are limited and continued growth in aquaculture production dictates that substitutes must be found that do not compromise fish health and growth. This study investigated the suitability of palm oil (PO) as a replacement for FO (cod liver oil) in diets of H longifilis. Triplicate groups of H longifilis fingerlings were fed five practical-type diets in which the added lipid was either 100% FO and 0% PO; 75% FO and 25% PO; 50% FO and 50% PO; 25% FO and 75% PO; or 0% FO and 100% PO for 8 weeks. There were no significant effects of diet on growth rate or feed conversion ratio. Lipid deposition was highest in the liver of fish fed 100% PO. No significant differences were observed between dietary treatments for moisture, protein and ash content in H. longifilis fingerlings. This study suggests that PO can be used successfully as a substitute for cod liver oil in diets for H. longifilis.
    Description: Includes:- 3 tables.;24 refs.
    Keywords: Aquaculture ; Heterobranchus longifilis ; Nigeria ; freshwater environment ; Diets ; Nutritional requirements ; Nutritive value ; Growth rate ; Feeding experiments ; Experimental culture ; Fish culture ; Carcasses
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    Relationship between the rainfall, water levels, flooding and fish supply from Asa Dam (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23247 | 19325 | 2018-03-25 12:49:34 | 23247 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Studies on the relationship between the rainfall, water levels and floods in Asa Dam Ilorin, Kwara State Nigeria was carried out for twelve months to determine the impact of these parameters on the supply of fish species from this dam to Ilorin and environ. Maximum rainfall (26.14 cm) was in September. The range values of rainfall recorded during this research was zero (November / February) to 26.14 cm (September). Water levels were lowest in April (11.40 m) and highest in September (12.80 cm). Increased water levels commenced from May (11.90 m) to October (12.60 m). The flooding of the dam began as from August when the dam spillway began to overflow. Assessment of fish catch from six fishermen around the lake showed significant increase in the fish supply at the dry season when water levels were low than the wet season (P 〈 0.05). Rainfall and water levels were negatively correlated.
    Description: Includes:- 1 table.;1 fig.;14 refs.
    Keywords: Environment ; Fisheries ; Nigeria ; Asa L. ; freshwater environment ; Rainfall ; Water levels ; Flooding ; Fish catch statistics
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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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  • 38
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    Comparative studies on the reproductive indices of the ovaries of Clarias gariepinus and Heterotis niloticus (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23255 | 19325 | 2018-03-25 14:40:53 | 23255 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The techniques for induced breeding of Clarias gariepinus has been developed and mastered by fish breeders. There is however no record of successful induced breeding of Heterotis niloticus in captivity. In this study, the reproductive indices of the ovaries, of the two fish species were compared. The ovaries of sexually matured samples were extracted and their weights measured. The mean gonadosomatic index (GSI) of C. gariepinus was 3.94% while that of H. niloticus was 1.61 %. The mean condition factor (K) was 5.28 in C. gariepinus while it was 2.03 in H. niloticus. Gonad and body weight relationship was positively correlated in both species (r = 0.69 in C. gariepinus and r = 0.37 in H. niloticus. Also, an inverse relationship existed between the body weight and GSI in the two species (r = -0.3 5 inC. gariepinus and r = -0.06 in H. niloticus.
    Description: Includes:- 2 tables.;15 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Heterotis niloticus ; Nigeria ; Ibadan ; freshwater environment ; Reproduction ; Gonadosomatic index ; Morphometry
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  • 39
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    The fishery of Lake Yamama, Kebbi State, Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23256 | 19325 | 2018-03-25 14:42:01 | 23256 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The highlights of the Fisheries Assessment Survey conducted at Yamama Lake in Kebbi State, North-western Nigeria in 2005 is presented. There were 17 fish species found in fishermen's landings during the survey period. About 25 fishermen were found using undersized nets to catch the juveniles of these species. Fishing pressure was found to be very high. The lake is 900 m in length and 195 m wide giving a surface area of about 18 hectares. For an optimum catch, about 4 fishermen ought to have engaged in full time fishing activities if the fisheries of the lake are to be managed on a sustainable basis. However, a surplus of over 100 fishermen was recorded actively fishing during the period of the assessment. All these have a depleting effect on the abundance and sizes offish caught from the lake. A community based fisheries management system, which establishes a participatory involvement of fishermen in the conservation and rational exploitation of fisheries resources for the well being of the stakeholders is recommended for the Lake.
    Description: Includes:- 3 tables,;1 fig,;4 refs.
    Keywords: Fisheries ; Nigeria ; Yamama L. ; freshwater environment ; Stock assessment ; Catch statistics ; Catch/effort ; Fishermen ; Fishermen statistics ; Fishery statistics
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  • 40
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    Fin fish assemblage of the main channel of the lower Benue River, Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23220 | 19325 | 2018-03-18 13:43:43 | 23220 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Fish species assemblage in the lower Benue River was assessed by collecting samples in 5 established sample stations within Benue state. Some physical and chemical parameters were also assessed. The mean values of the parameters recorded include; Temperature 24~?C, pH = 7.09, Alkalinity (Cac03) = (37 mg/l) Amonia (NH3) = (37.9 mg/I), C02= (9.5mg/I), Chloride (Nacl) = (12.8mg/I), Total hardness = (11mg/I), Dissolved oxygen (Do) = (11 mg/I), and Turbidity = (45cm). Forty eight (48) fish species belonging to 32 genera in 18 families were recorded. It was observed that the family Bagridae had the highest number of species (7, 15%) Mormyridae, Characidae and Mochokidae followed with 5 species (10.63%) each. Cyprinidae, Clariidae and Cichlidae had 8.51% with 4 species each. Citharinidae formed 6.38% with 3 species, while schilbeidae formed 4.25% (2 species). All other families had only one species recorded in it (2. 12%). Bagridae and clariidae dominated in station 1, while the family Mochokidae showed dominance in station 5. Family Ariidae, Gymnarchidae and Centropomidae were rare in the lower Benue River. There were no significant differences in the abundance of the fish species caught in the different stations. Among the stations also, the l1umber of fish caught during the seasons did not differ (p〈0. 05). These physical and chemical factors did not significantly affect occurrence and even distribution offish in the study.
    Description: Includes:-4 tables.;10 refs.
    Keywords: Ecology ; Fisheries ; Nigeria ; Lower Benue R. ; freshwater environment ; Population dynamics ; Check lists ; Species diversity ; Finfish fisheries
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  • 41
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    Comparison of fried and baked fish Oreochromis niloticus cakes (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23219 | 19325 | 2018-03-18 13:41:52 | 23219 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Oreochromis niloticus fish-in-cake were made to improve its food value as well as create new menu. Fried fish-in-cake was 66.2% appealing in its colour, taste, texture and odour to assessors than the 64% rating for baked fish-in-cake.
    Description: Includes:- 2 tables.;11 refs.
    Keywords: Fisheries ; Oreochromis niloticus ; Nigeria ; freshwater environment ; Fishery products ; Processed fishery products ; Fish utilization
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  • 42
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    Fermentation of Synodontis membranaceus using different percentage of ginger (Zingiber officinale) (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23223 | 19325 | 2018-03-18 13:54:52 | 23223 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Synodontis membranaceus was subjected to fermentation for a period of one month with varying concentration of ginger (5%, 10%, 15%, 20%) and 20% salt as spices to produce a paste. It was buried underground at 34 +-3~?C and analyzed for proximate composition, pH, microbial load, and organoleptic properties at the beginning and end of the fermentation. Results show steady increase in nutrients such as crude fat, ash, and NFE (nitrogen free extract) but decrease in crude fiber. There were fluctuations in the crude protein of the fermented samples, an evidence of fermentation. There was an increase in the microbial load of the different treatments and a slight decrease in the moisture content. The organoleptic analysis also showed preference for taste, aroma, and overall acceptability for 20% ginger and a significant difference (p〈 0.05) was observed in the taste scores for salt only and 20% ginger.
    Description: Includes:- 5 tables.;31 refs.
    Keywords: Fisheries ; Synodontis membranaceus ; Nigeria ; freshwater environment ; Fermentation ; Fermented products
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    Check list of zooplankton in culture tanks, at NIFFR Green House, New Bussa (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23227 | 19325 | 2018-03-18 14:52:52 | 23227 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: A quantitative study of zooplankton fauna was carried out on 10 nursery tanks used for zooplankton culture in National Institute for Freshwater Fisheries Research, (NIFFR) New Bussa in the year 2006, from 1st July to 30th July Fifteen (15) species of zooplankton were recorded. The major groups found were Cladocera, Rotifera and Copepoda, their percentages are as follows 30.10%, 48.54%, 21.36% respectively. The dimension of each tank is 2m x 2m x 0. 70m, the species composition of zooplankton comprised of Cladocera (31), Rotifera (50), and Copepoda (22). The zooplankton is used as natural fish food for fish larvae in fish breeding hatchery for aquaculture development, Rotifera has the highest percentage through out the month of July
    Description: Includes:- 1 table.;8 refs.
    Keywords: Aquaculture ; Ecology ; Nigeria ; New Bussa ; freshwater environment ; Zooplankton ; Culture tanks ; Check lists
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  • 44
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    Flotation, growth, food utilization and economic evaluation of Oreochromis niloticus fingerlings on Lemna paucicostata diets (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23234 | 19325 | 2018-03-18 15:09:44 | 23234 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The inquisition into feed flotation has led to the bio-chemical combination of some conventional feedstuffs with Duckweed Lemna Paucicostata meal fixed at 0, 4, and 8 percent in iso-nitrogenous 30% crude protein, iso-caloric 37 kcal/g diets for Oreochromis niloticus fingerlings mean weight ranged 21.00 21.50g in a fifty-six day feeding trial. Significant (P〈0. 05) feed flotation were obtained at 4 and 8% over 0% Lemna inclusion. There were no significant differences (p〉 0.05) in growth food utilization and survival of fish in all diets. The Cost evaluation and Feed Conversion Efficiency were positive in 8% Lemna diet than the whole artificial feed. However, because of the positive imparts on tilapia culture, Duckweed meal was recommended up to 8% inclusions in diets for tilapia fingerlings.
    Description: Includes:- 3 tables.;2 figs.;24 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Lemna paucicostata ; Nigeria ; New Bussa ; Floating feeds ; freshwater environment ; Feeding experiments ; Feed composition ; Feed efficiency ; Nutritional requirements ; Fish culture ; Diets
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  • 45
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    Effect of stocking density on the growth rates of Clarias gariepinus in a floating hapa system (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23233 | 19325 | 2018-03-18 15:08:08 | 23233 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Any aquaculture system needs constant supply of good quality water. In the arid zone of Nigeria this problem becomes more acute. This study therefore tries to rear fish is enclosure (net-hapas) suspended in outdoor concrete tanks to maximize the use of water and feed. About 350 fingerlings (of mean weight of 4.93g) of Clarias gariepinus caught in the same locality in Lake Alau ( Maiduguri, Borno State) were stocked in net-hapas (1 x 1x 1 m) at 25,50 and 100 fish/m3. Each treatment was duplicated the fish were fed three times a day on a formulated 40% protein balanced diet at 5% body weight per day. Batch weighing of the fish in each net-hapa was carried out every fortnight for body weight measurement. Water quality parameters such as dissolved oxygen, pH and temperature were measured weekly. The results of the fish growth and feed utilization efficiency were pooled for each treatment, computed and analyzed using one-way-analysis of variance (ANOVA) Mortality was highest in treatment 3 (100/m3) when compared with treatments I and 2 (25/m3 and 50/m3 respectively). This is mainly due to handling stress because of the long distance from Lake Alau 10 the NIFFR Zonal Station outdoor ponds (〉45km) and the method of capture (Cast net). There were slight differences in mean final weight and food conversion of the fish at the end of the study but no statistical differences were found among the treatments (P〈0. 05).
    Description: Includes:- 3 tables.;7 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Maduguri ; freshwater environment ; Stocking density ; Fish culture ; Growth rate ; Cage culture
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  • 46
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    The marketing and distribution of fish in New Bussa fish market area of Niger State (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23237 | 19325 | 2018-03-18 15:16:31 | 23237 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Fish marketing and distribution in New-Bussa market was studied weekly for three months (August -October, 2005). The result showed that the major fish species common in New-Bussa fish market are Clarias,Citharinus,Mormyrus,Bagrus,Alestes, Synondontis,Lates, Chrysicthyes, Tilapia, Hydrocynus and Clarotes. The business of catching, marketing and distribution of fish is controlled by young men and women of the age bracket of 14-40 years old. Over 15 different ethnic groups from 14 states in Nigeria and Ghana, Chad, Benin Republic, Mali are involved in fish marketing and distribution business in New-Bussa. The indigenous ethnic groups are Gungawa, Busawa, Kambari, and Nupe, they formed 65% of the ethnic groups found in New-Bussa. The remaining ethnic groups are migrants. Women dominated the trading and processing of fish.
    Description: Includes:- 4 tables.;7 figs.;5 refs
    Keywords: Fisheries ; Management ; Nigeria ; New Bussa ; freshwater environment ; Marketing ; Market research ; Fish
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  • 47
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    Assessment of fishery content in agricultural activities of the rural women in Kukawa Local Government Area (LGA) of Borno State (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23235 | 19325 | 2018-03-18 15:11:53 | 23235 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Content of fishery in agricultural activities of rural women was carried out in Kukawa L.G.A of Borno State. A total of 96 respondents were randomly interviewed with the aid of structured questionnaire and data presented with descriptive statistical tools. In addition to reproductive role in marriage, women are actively involve in agriculture for economic benefit, but weak socio-economic variables need to be strengthen for improve productivity and economic benefit. Fishery (10%) has a low content in the agricultural activities of rural women which is dominated by crop farming and agricultural processing. Poor annual financial return of N19, 585.33 on average as reward for long period of 8 hours on average put in agriculture is discouraging. Diversification into fish marketing and process provides avenues for viable daily income to the women in the area. Identified constraints are extension delivery, financial poverty, farm land, technological input and infrastructure. Opportunities to empower rural agricultural women include social capital formation, co-operative group, access to fertile farm land, pro-active extension information dissemination as well as participation in government programmes like on-going fadama and agricultural credit schemes.
    Description: Includes:- 3 tables.;14 refs.
    Keywords: Agriculture ; Fisheries ; Sociology ; Nigeria ; Kukawa ; freshwater environment ; Women ; Socioeconomic aspects
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  • 48
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    The role of microfinance in wealth creation among the artisanal fisherfolks in Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23245 | 19325 | 2018-03-25 12:41:19 | 23245 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: One of the greatest challenges in Nigerian rural development process particularly in the fishing communities, which are often isolated and vulnerable, is to address the constraints that exclude people from full participation in the management of their financial resources. Majority of fishers dwell along the margins of Lakes, Rivers and Creeks and mostly operate without dependable financial resources, business loans or a safe place to keep their savings. This, to a greater extent, inhibits their growth and expansion to the realization of formalized entrepreneur's status that constitutes a set-back to the sector and the National economy at large. However the recent economic transformations in the country pursue microfinance not only as a poverty alleviation tool but also as a sound and viable business. This paper reviewed the concept of microfinance, its implementation, roles, constraints etc. to serve as a guide for adoption and utilization amongst the artisanal fisher folks with the view to increasing their general well-being on a sustainable basis.
    Description: Includes:- 1 fig.;8 refs.
    Keywords: Fisheries ; Management ; Nigeria ; freshwater environment ; Artisanal fishing ; Financial institutions ; Financial resources ; Financing ; Financial management ; Fishery economics
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  • 49
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    Production of all male fingerlings through feeding of androgenic steroid (Mesterolone) in the diet fed as first food to tilapia Oreochromis niloticus (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23252 | 19325 | 2018-03-25 14:35:14 | 23252 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: Non-conventional hormone, Androgenic Steroid (mesterolone) was prepared and incorporated (using ethanol) at various concentration of 0mg, 30mg, 40mg, 50mg, 60mg each in 0.2kg of fish meal. The six levels were replicated 3 times in plastic tanks. The fish meal incorporated with hormone (mesterolone) were fed as first food to 7 -day old fry of Oreochromis niloticus for 28 days after which the tilapia fry were fed on ordinary fishmeal for another 8 weeks. At the 9th and 12th weeks and after feeding with the hormone, the number of survivals and the weights gained were recorded! After the 12week, the males and females were separated using hand-magnifying lens. The economic viability of all male production using non-conventional hormone (mesterolone) was calculated. Hormone fed to O. niloticus was found to have no significant effect (P〉0. 05) on the survival and the mean weight gain of the O. niloticus. But the hormone fed had great influence on the female: male ratio i.e. treatment difference was highly significant (P〈0.01). Tilapia fry fed with 40mg/0.2kg feed was found to have the largest percentage of males 97% while those fed with 30mg/0.2kg, 50mg/0.2kg, 60mg/0.2kg and 70mg/0.2kg had 51%,91%,86%,89%, and 80% males respectively.
    Description: Includes:- 3 tables.;1 Fig.;15 refs.
    Keywords: Aquaculture ; Oreochromis niloticus ; Nigeria ; Ibadan ; freshwater environment ; Breeding ; Fish culture ; Sex hormones ; Diets ; Sex ratio ; Sex reversal
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  • 50
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    The response of Heterobranchus longifilis to the combination of fish meal at different levels with 40% of groundnut cake in its diet (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23257 | 19325 | 2018-03-25 14:43:44 | 23257 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: A study was carried out on the response of Heterobranchus longifilis to the replacement of fish meal with 40% of groundnut cake in six experimental diets with varying protein levels (26.13%, 30.88%, 34.87%, 39.28%, 44.19% and 50.76%). The highest weight gain (72.46g), specific growth rate (SGR) (2.16), the best food conversion ratio (FCR) (1.91) and gross food conversion efficiency (GCE) (0.016) were recorded for fish fed diet with 50.76% (Diet VI) crude protein (40%groundnutcake and 38.15% fish meal). There was no significant difference (P〉0.05) in the final weight offish fed the various diets. The diet with 44.19% (diet V) crude protein having 40% groundnut cake and 31.81 % fish meal gave a conversion ratio not significantly different (P〉0.05) from fish fed diet VI and so it will be more economical to use this feed with lower fish meal. There was significant variation (P〈0.05) in the SGR and GCE offish fed varying diets. The FCR and GCE followed a similar trend in that diet VI had the best conversion of food. The fish fed 26.13% crude protein (Diet I) which had the poorest growth in this experiment also had the lowest percentage survival (42.67%), fish fed diet III ranked the highest in survival (78.67%). There was no significant variation (P〉0.05) in the survival of fish fed the varying diets. The combination of groundnut cake and fish meal in the diet of H. longifilis that showed increased nutrient density and digestibility for optimal growth was obtained where the percentage groundnut cake/fishmeal was 40/31.81.
    Description: Includes:- 2 tables,;18 refs.
    Keywords: Aquaculture ; Heterobranchus longifilis ; Nigeria ; freshwater environment ; Feeding experiments ; Nutrition ; Diets ; Fish meal
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    Impact of seasonal variation on population of weevils (Neochetina spp) (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23258 | 19325 | 2018-03-25 14:47:17 | 23258 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The impact of seasonal variation on population of weevils (Neochetina Spp), commonly used as water hyacinth bio-control agent was carried out in the National Institute for Freshwater Fisheries Research water-hyacinth insect laboratory. The experiment was conducted between May 2006 and April, 2007. Ten plastic containers of 50cm depth, 60cm diameter and 20-litre capacity each filled with 16- litters of water and 20 bunches of water hyacinth were used for the experiment. Ten weevils made up of five male and five female were introduced into each of the plastics container. The weevils were monitored daily, their numbers recorded. The result showed that, during wet season (May to October) the population of weevils increased, while it decreased during the dry season (November to April). Data analysis showed that, there was significant difference between wet season and dry season (P〈0.05).
    Description: Includes:- 1 table,;7 refs.
    Keywords: Biology ; Neochetina spp. ; Nigeria ; Weevils ; freshwater environment ; Seasonal variations ; Population dynamics ; Aquatic insects
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 321 - 323
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