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  • 1
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    Publication Date: 2021-05-19
    Description: The distribution, diversity and abundance of littoral zooplankton, and the relationships between zooplankton and juvenile fishes in the littoral zone (Lates niloticus (L.), Oreochromis niloticus (L.) and Rastrineobola argentea (Pellegrin)) are being studied. Copepoda were tha most abundant zooplankton in most samples followed by Rotifera and Cladocera. Cyclopoid copepods were more abundant than calanoids. Rotifera was the most diverse group with 33 species recorded. Lates niloticus shifted from a diet of zooplankton to other food items, mainly insects, Caridina nilotica (Roux)and fish as they grew. Juvenile O. niloticus shifted from a zooplankton diet to one of insects, phytoplankton and plant material as they grew. Rastrineobola argentea fed mainly on cladocerans though copepods were also consumed. Changes in feeding preferences were observed spatially and temporally.
    Description: Published
    Keywords: Lates niloticus ; Oreochromis niloticus ; Rastrineobola argentea ; Caridina nilotica
    Repository Name: AquaDocs
    Type: Report Section , Not Known
    Format: pp.52-62
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  • 2
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    Publication Date: 2021-05-19
    Description: The shrimp Caridina nilotica (Roux) is now the dominant prey for juvenile Lates niloticus (L.) in Lake Victoria, Kenya. Juveniles feed on zooplankton when 1-2 cm TL and switch to C. nilotica by 3 cm. Depth may affect diet, with fish in the shallows feeding on small fish, while in deeper waters they prey on C. nilotica. Further studies are underway into the predator/prey size relationship.
    Description: Published
    Keywords: Caridina nilotica ; Lates niloticus
    Repository Name: AquaDocs
    Type: Report Section , Not Known
    Format: pp. 48-51
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  • 3
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    Publication Date: 2021-05-19
    Description: Bottom trawl surveys were conducted in Kenyan waters of Lake Victoria during the period September 1997 and March 1999. The means of fish biomass for the two most important species: Lates niloticus (L.) and Oreochromis niloticus (L.) were estimated at 61.5 kg ha and 4.5 kg ha respectively. There were few L. niloticus greater than 80 cm TL and O. niloticus greater than 50 cm TL, though these species attain maximum sizes of 205 cm and 65 cm respectively. Oreochromis niloticus was mostly found shallower than 5 m though some specimens were encountered deeper than 10 m, suggesting that the species has extended its ecological range. Very low catches were obtained from areas under water hyacinth cover. Water in such areas was turbid with oxygen levels below the critical 3.0 mg L.
    Description: Published
    Keywords: Fishery management ; Stock assessment ; Data collections ; Freshwater weeds ; Fishery surveys ; Lates niloticus ; Oreochromis niloticus
    Repository Name: AquaDocs
    Type: Report Section , Not Known
    Format: pp.46-62
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