Morphometries, length-weight relationship and condition of Rastrineobola argentea (Pellegrin 1904) in the Winam Gulf of Lake Victoria (Kenya)

Manyala, J. O. ; Berghe, E. Vanden ; Dadzie, S. (1995)

Correlation between total length (TL), fork length (FL) and standard length (SL) of Rastrineobola argente'{ ~ellegrin 1904) in the Winam Gulf of Lake Victoria indicate that FL = 0.92 TL - 0.74 and SL = 0.90 TL - 1.7~. Le~gth-welght relationship of log-transformed data shows that the slopes of the regression lines were 3.06 to 3.22 for juveniles, 2.70 to 3.~5 for males and 3.24 to 3.71 for females. Thee slopes were significantly different between groups at at a = 0,05. The Fulton s condition factor (K) was highest in December (1.019-1.073) and March IApril (1.015-1.030) but lowest in June (1.00-1.025) for all stations. Significant differences between groups demands for the use of different growth models for juveniles: mal~s and females especially for the von Bertalanffy growth equation which uses length-weight relationship. Obse~ed .cycl~cv~n- ations in condition factor suggests two peak breeding seasons for this species in the Winam Gulf. The practical implication of these results in stock assessment using length-based fish stock assessment methods is briefly discussed.



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