Length-weight relationship, Condition factor, Sex ratio, Gonadal Somatic Index and Size at Maturity of Omena, Rastrineobola argentea (Pellegrin, 1904) in Lake Victoria, Kenya.

This study investigated the growth, mortality and recruitment of Rastrineobola argentea in Lake Victoria on the basis of length–frequency data collected during the period 2014–2015. The asymptotic length (L∞) had a mean (±SE) value of 53.50 ± 0.50 mm SL, growth curvature (K) of 0.81 ± 0.06 year−1, total mortality (Z) of 2.96 ± 0.12 year−1, a natural mortality (M) of 1.23 ± 0.06 year−1, a fishing mortality (F) of 1.74 ± 0.07 year−1, an exploitation rate (E) of 0.59 ± 0.01, a growth performance index (∅′) of 3.36 ± 0.02 and a length at 50% capture (L50) of 28.25 ± 0.43 mm SL. The fish exhibited a peak breeding during the months of May and August. The Beverton and Holt relative yield‐per‐recruit model indicated mean (±SE) indices as 0.37 ± 0.01 for optimum sustainable yield (E0.5), 0.76 ± 0.01 for maximum sustainable yield (Emax) and 0.66 ± 0.01 for economic yield (E0.1). Compared with previous studies, there is a great decline in the sizes of R. argentea stocks in Lake Victoria. Thus, management measures should include restriction on illegal seine nets <10 mm mesh size and re‐enforcement of a fishing ban or a closed season.

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Growth, mortality and recruitment of silver cyprinid (Rastrineobola argentea) in the open waters of Lake Victoria, Kenya

Yongo

Manyala

Agembe

2018

Lakes & Reservoirs

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Changes in some biological parameters of the silver cyprinid, Rastrineobola argentea (Pellegrin, 1904) in the Nyanza Gulf of Lake Victoria, Kenya

et al. 2019

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The study examined length–weight relationship, condition factor, size at 50% maturity and fecundity of Rastrineobola argentea in the Nyanza Gulf of Lake Victoria, Kenya. The 500 fish examined had a mean length of 39.4 ± 0.3 mm SL, ranging from 17 to 55 mm SL and weighed between 0.08 and 2.44 g. The length–frequency analysis indicated a unimodal distribution between 35 and 40 mm SL, with a modal length at 37 mm SL. The fish exhibited a positive allometric growth pattern (b = 3.4). The condition factor for all fish was 1.02. Male fish showed a decreasing trend in condition factor with increasing body length, while females exhibited an increasing trend. The length at 50% maturity was estimated at 43 and 44 mm SL for males and females, respectively. The smallest mature male was 41 mm SL and 42 mm SL for females, with 100% maturity already exhibited at 49 mm SL. Fecundity varied from 235 eggs for 33 mm SL to 2,309 eggs for 54 mm SL fish. positive linear relationships were found between fecundity against standard length and ovary weight. Comparisons with previous studies in this lake over time indicated a decrease in length at maturity and an increase in fecundity, which are strategies to maximize reproductive success. The findings of this study provide useful information for managing the fishery.

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Some biological aspects of the Silurid Catfish, Bagrus docmak (Forksskal, 1775) in Lake Victoria, Kenya

Yongo

Agembe

2021

Lakes & Reservoirs

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Bagrus docmak is a relatively large catfish found in freshwater habitats in Africa (Ogari & Asila, 1992). It inhabits lakes, swamps and rivers in both shallow and deep waters associated with rocky bottoms and coarse substrates (Lock, 1982). Bagrus docmak is an indigenous piscivorous fish native to Lakes Victoria, Albert, Edward and George and the Nile and Kagera Rivers in Uganda (Ogari & Asila, 1992;Ogutu-Ohwayo, 1990). It is an important source of economic livelihoods to communities located around Lake Victoria. Additionally, B. docmak is a species of high aquaculture potential largely because of its attractive attributes that include size, taste, flesh quality and overall commercial importance (Mwanja et al., 2014). Being a carnivorous fish, it can also be used in polyculture with Nile tilapia

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Length-weight relationship, Condition factor, Sex ratio, Gonadal Somatic Index and Size at Maturity of Omena, Rastrineobola argentea (Pellegrin, 1904) in Lake Victoria, Kenya.

Cited by 3 publications

References 4 publications

Growth, mortality and recruitment of silver cyprinid (Rastrineobola argentea) in the open waters of Lake Victoria, Kenya

Growth, mortality and recruitment of silver cyprinid (Rastrineobola argentea) in the open waters of Lake Victoria, Kenya

Changes in some biological parameters of the silver cyprinid, Rastrineobola argentea (Pellegrin, 1904) in the Nyanza Gulf of Lake Victoria, Kenya

Some biological aspects of the Silurid Catfish, Bagrus docmak (Forksskal, 1775) in Lake Victoria, Kenya

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