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    • African Journal of Tropical Hydrobiology and Fisheries
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    • Lake Victoria Fisheries Organization (LVFO)
    • African Journal of Tropical Hydrobiology and Fisheries
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    Population parameters of Oreochromis leucostictus from Lake Naivasha, Kenya

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    Author
    Njiru, M.
    Ojuok, J.E.
    Date
    1996
    Type
    Article
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    Abstract/Overview

    Length-frequency data collected from fish landings on Lake Naivasha were used to estimate the growth parameters: total mortality (Z), growth performance index (¢'), exploitation rate and recruitment pattern in Oreochromis leucostictus. The asymptotic length (Lee) was 38 em and K 0.48 yr -I. Z was estimated as 3.5 yr -I, M was 0.19 yr -I, F was 2.6 yr .1 and E of 0.74. Recruitment occurs throughout the year, with a peak in January to March, while entry into the fishery occurs at a mean length of 15.9 cm. Existing restriction on the maximum number of gill nets allowed per fishing licence (10 per boat) and a minimum mesh size (10 cm) inthe lake are not adhered to. Poaching using illegal mesh size nets as small as 5 em and use of more than 10 nets per boat are common in the lake.

    Subject
    Fisheries; Fishing; Fish Species
    Publisher
    LVFO
    Is Part of Series
    Volume;7
    Permalink
    http://hdl.handle.net/11671/1936
    Collections
    • African Journal of Tropical Hydrobiology and Fisheries [36]


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