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  • 1
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    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24226 | 19325 | 2018-05-19 07:15:01 | 24226 | Fisheries Society of Nigeria
    Publication Date: 2021-07-15
    Description: Studies of food and feeding ecology are important to investigate trophic interrelationships of fishes in their resident water bodies. These are usually achieved using various important methods. However because no single measure gives an overall representation of the feeding habits of fish, best results are achieved only when methods are used to complement one another. This paper reviews various methods used in studying trophic fish ecology and suggests consolidation of the traditional or basic methods with relevant statistical indices and local ecological knowledge. More advanced methods are also proposed as valuable tools because they compensate for some possible errors that may arise from the use of quantitative methods.
    Description: Includes: 28 references.
    Keywords: Ecology ; Fisheries ; Nigeria ; Oyo State ; freshwater environment ; Ecosystems ; Trophic levels ; Interspecific relationships ; Trophic relationships ; Food ; Ecology ; Consolidation ; Methodology ; Feeding behaviour ; Stomach content ; Food webs ; Statistical analysis ; Fish culture
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 292-294
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  • 2
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    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23398 | 19325 | 2018-04-12 07:21:37 | 23398 | Fisheries Society of Nigeria
    Publication Date: 2021-07-14
    Description: Design characteristics and mode of operation of purse seining off Orimedu fish Port was investigated between August 2007 and February 2008.Tha fish catch composition was also analysed. The purse seine net has the highest number of bundles. The mesh size ranges from 2.5 to 05.0cm.The purse seine net was highly selective fish target specific, catching mostly coastal pelagic fish species. Ten fish species belonging to 5 families were frequently encountered. Total weight of the fish landed was 444.50kg while the average weight of the catch landed per canoe was 30.53kg respectively. Ethmalosa fimbriata (Bonga fish) and Sardinella maderensis (flat sardines) dominated the catch with 2l1.00kg (45.40%) and 143.00(32.10%) by weight of the total catch. Chloroscombrus chrysurus (Atlantic bumper fish), Caranx hippo (Crevail jack), Sphyma couardi (hammer head shark) and Carcharhinus spp.(shark) contributed between 0.33-3.47% ofthe total fish landed by weight. Total length of the fish landed also indicated that the purse seine was highly selective and does not deplete the population of sub-adult's juvenile fish species. Salinity was found to be the most variable factor affecting abundance and subsequent catch of coastal pelagic fishes particularly Ethmalosa fimbriata during the dry season. This study revealed that over fishing of fish stocks may be avoided provided the same fishing pressure observed during this study period is maintained in terms of the number of fishing crafts, number of boat days or fishing and mesh-size of the purse seine fishing gear used.
    Description: Includes:- 4 tables.;7 refs.
    Keywords: Fisheries ; Nigeria ; Orimedu Fish Port ; marine environment ; Catch statistics ; Check lists ; Species diversity ; Gear construction ; Gear research
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 125-129
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  • 3
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    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23453 | 19325 | 2018-05-04 17:40:12 | 23453 | Fisheries Society of Nigeria
    Publication Date: 2021-07-14
    Description: Diet of the juvenile Gorean snapper, Lutjanus goreensis from Five Cowrie Creek was investigated between April 2008 and January 2009. Analyses of 184 specimens by numerical (NO), frequency of occurrence (FO) and geometric index of importance (GII) methods, respectively revealed a moderately high proportion (47.83%) of stomachs with food or prey. Shrimps and crabs constituted more than 80 % of total prey items. Other dietary components included lobsters, stomatopods, whole fish and fish parts. Similarly, analysis of diet composition by size - groups also indicated a predominance of the shrimps and crabs over all other prey items. In conclusion, L. goreensis can be described as a top-level carnivore feeding almost exclusively on epibenthic crustaceans in the juvenile stage.
    Description: Includes:- 2 tables.;21 refs.
    Keywords: Ecology ; Fisheries ; Lutjanus goreensis ; Nigeria ; Lagos Greek ; brackishwater environment ; Diets ; Stomach content ; Feeding behaviour
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 232-236
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  • 4
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    Fisheries Society of nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23484 | 19325 | 2018-05-06 12:47:40 | 23484 | Fisheries Society of Nigeria
    Publication Date: 2021-07-14
    Description: A bio- economic assessment based on the Return On Investment (ROI) of a single purse seiner was done from August 2007 to February 2008 at Orimedu. Catch composition in terms of relative abundance of species and their sizes were also assessed. Total income was derived from the product of average selling price for a basin of fish, average number of fish basins sampled from a purse seiner, number of fishing trips of a purse seiner per month and the total number of months. Total costs were derived from the sum of capital costs, operational costs, depreciation costs, maintenance cost and labor cost which was estimated as 1/3 rd of total income. Fish catch was dominated by mature fish consisting of over 90 % clupeids and measured in heaps of 200 pieces in basins. On the average, there were 17 basins of fish from a purse seiner. Each basin was valued at N8000 and the average number of fishing trips in a month was 9. The calculated ROI was 30.96% indicating that the fishing method was lucrative. The study showed that purse seining is both biologically and economically sustainable with great potentials to alleviate poverty if adopted by the local Nigerian fisherfolks.
    Description: Includes:- 2 tables.;5 refs.
    Keywords: Fisheries ; Management ; ASE ; Nigeria Coast ; marine environment ; Economic analysis ; Fishery economics ; Capture fishery economics ; Financial management ; Investments ; Costs ; Catch composition ; Seiners
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 374-376
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  • 5
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    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24643 | 19325 | 2018-05-24 09:47:33 | 24643 | Fisheries Society of Nigeria
    Publication Date: 2021-07-15
    Description: Traditional Ecological Knowledge (TEK) is the sum of data and ideas acquired by a human group on its environment. Over the years, there has been a growing lack of confidence in centralized scientific fisheries management. Traditional ecological knowledge is recognized as a valuable tool for understanding trends of marine resources, ecosystem management and conservation. Some reseachers and policy-makers have called for TEK to play an increased role in fisheries management decisions. TEK helps to develop management practices which allow economic development without the over-exploitation of natural resources. However, the acceptance of TEK in fisheries management has been partly hindered by difficulties in translating local ecological knowledge into a form that can be applied dierectly to conventional top down approach of western fisheries management. For full integration of TEK and scientific knowledge in fisheries management, there must be constant communication, continuous education, mutual trust, collaborative validation of knowledge and respect for a workmg relationship to be sustained.
    Description: Includes: 17 references.
    Keywords: Ecology ; Fisheries ; Nigeria ; Fisheries management ; TEK ; Scientific knowledge ; Overexploitation ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 310-312
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  • 6
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    In:  http://aquaticcommons.org/id/eprint/4068 | 424 | 2011-09-29 16:29:43 | 4068 | Fisheries Society of Nigeria
    Publication Date: 2021-06-29
    Description: Macroeconomic growth and the development of sustainable business activities are interrelated. In Lagos State, aquaculture is a marginal economic activity thriving mainly on a semi-intensive level. Notwithstanding the available potentials for the development of successful commercial aquaculture enterprises in the state, the transformation to a full-flagged industry continues to be undetermined by certain critical factors. Feasible development strategies may be sought in increasing all stakeholders' capacity in the formulation of policies, plans and regulations, a complete separation of aquaculture from the capture fisheries in administrative structure and policy; the adoption of precautionary approach; provision of economic incentives to enhance private investments and increase output,respectively
    Keywords: Fisheries ; Aquaculture ; Policies ; Nigeria ; Lagos ; aquaculture development ; aquaculture economics ; aquaculture enterprises ; aquaculture regulations ; fishery industry ; policies
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 500-510
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