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  • 1
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    The relationship between boat size and fish catches in the gillnet fishery of Lake Victoria, Uganda (2021)
    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4954 | 424 | 2011-09-29 15:39:55 | 4954 | Lake Victoria Fisheries Organization
    Details
    Publication Date: 2021-07-07
    Description: The number and size composition of gillnets, fishing grounds, and the quantity and composition of fish catches were related to the size of fishing boat. The overall number of gillnets per boat increased from 20.9 + or - 2.3 nets in 5-6 m long boats to 88.6 + or - 11.8 nets in 11-12 m long boats. The proportion of large mesh sizes, + or more than 127 mm, also increased from 40% in 5-6 m long boats to 100% in boats longer than 10 m. Fish catches are related to the size of boat and this should be considered when formulating management guidelines of the lake's fishery. Promotion of large fishing boats 8 m or longer and restriction on the number and/or mesh size of gillnets of smaller boats could increase ecological and socio-economic benefits.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Uganda ; stock assessment ; data collection ; data report ; Lates niloticus ; Oreochromis niloticus
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 63-77
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  • 2
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    Current status of the fish stocks of Lake Victoria (Uganda) (2021)
    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4951 | 424 | 2011-09-29 15:40:31 | 4951 | Lake Victoria Fisheries Organization
    Details
    Publication Date: 2021-07-07
    Description: A total of 457 hauls were taken during experimental bottom trawl surveys in the Uganda sector of Lake Victoria between November 1997 and June 1999 to estimate composition, distribution and abundance of the major fish species in waters 4-60 m deep. Fifteen fish groups were caught with Nile perch, Lates niloticus (L.), constituting 94% by weight. Haplochromines and L. niloticus occurred in all areas sampled, while Nile tilapia, Oreochromis niloticus (L.) and other tilapiines were restricted to waters 30 m deep or less. The mean trawl catch rate in the zone where artisanal fishermen operate (i.e. in waters less deep than 30 m was 165 kg hr, of which 93.6% comprised L. niloticus. Species diversity and relative abundance decreased with increasing water depth.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Uganda ; Kisumu ; stock assessment ; data collection ; data report
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 10-25
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  • 3
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    Managing Nile perch using slot size: is it possible? (2021)
    In:  eabirabwa@lvfo.org | http://aquaticcommons.org/id/eprint/4145 | 2238 | 2011-09-29 16:25:06 | 4145 | Lake Victoria Fisheries Organization
    Details
    Publication Date: 2021-06-30
    Description: The fishery of Lake Victoria became a major commercial fishery with the introduction of Nile perch in 1950s and 1960s. Biological and population characteristics point to a fishery under intense fishing pressure attributed to increased capacity and use of illegal fishing gears. Studies conducted between 1998 to 2000 suggested capture of fish between slot size of 50 to 85 cm TL to sustain the fishery. Samples from Kenya and Uganda factories in 2008 showed that 50% and 71% of individuals processed were below the slot size respectively. This study revealed that fish below and above the slot has continued being caught and processed. This confirms that the slot size is hardlyadhered to by both the fishers and the processors. The paper explores why the slot size has not been a successful tool in management of Nile perch and suggests strategies to sustain the fishery
    Description: European Union
    Description: German Technical Cooperation (GTZ)
    Description: Implementation of a Fisheries Management Plan (IFMP) Project for Lake Victoria
    Description: Paper presented to the Lake Victoria Stakeholder’s Conference, Kampala, 27-30 October 2008
    Keywords: Management ; Conservation ; Fisheries ; Lake Victoria ; Nile perch ; exploitation ; management ; slot size.
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 9-14
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  • 4
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    Fish stock assessment (2021)
    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19337 | 4230 | 2020-09-07 21:44:19 | 19337 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-06-25
    Description: Fisheries are based on stocks of wild animals living in their natural environment stock is a sub-set of one species having the same growth and mortality parameters, and inhabiting a particular geographic area and has little connection with adjacent groups. The fish stocks are affected by man's activities and the success of the fisheries depends critically on the state of the fish stocks. Decision-makers need scientific advice about the state of the fish stocks. The science of stock assessment is concerned with provision of this advice
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 5
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    The Effect of Boat Size on Fish Catches in the Gillnet Fishery of Lake Victoria (2021)
    Fisheries Resources Research Institute (FIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19684 | 4230 | 2020-09-07 19:54:29 | 19684 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-03
    Description: The study investigated how the size offishing boat was related to the number and composition of gill nets, fishing grounds and the quantity and composition offish catches. The overall number ofgill nets per boat increased with boat size from 20.9 ± 2.3 nets in 5.0-5 .9 m long boats to 88.6 ± 11.8 nets in 11.0 -11.9 m long boats. The proportion oflarge mesh sizes 〉127 mm also increased with increase in boat size from 40.4% in 5.0-5 .9 m long boats to 100% in boats 〉10 m long. The majority oflarge boats 8.0 long fished in offshore waters targeting Nile perch. Their Catches were composed of97.7-100% Nile perch by weight. Boats 〈8.0 m fished in inshore waters targeting Nile tilapia. Nile tilapia and other fish species excluding Nile perch contributed 31 .0-59.9% oftheir catch by weight. The overall mean fish catch rates increased with boat size from 12.6 ± 1.9 kg in 5.0-5.9 m long boats to 78.2 ± 16.4 kg in 11.0-11.9 m long boats. 73 .6-89% ofNile perch caught by boats 〈8.0 m long were 〈50 cm TL, smaller than the legal minimum size allowed for harvest, whereas 〈17% of ile perch in larger boats were 〈50 cm TL. The size ofboat has an effect on fish catches and this could be an additional guideline to management ofthe lake' s fishery
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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