Age and growth of Heterotis niloticus around Pategi in the middle River Niger, Kwara State

Adekeye, A.O. (1993) Age and growth of Heterotis niloticus around Pategi in the middle River Niger, Kwara State. In: 10th Annual Conference of the Fisheries Society of Nigeria (FISON) , 16-20 November 1992 , Abeokuta, Nigeria.

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Abstract

Biological studies of Heterotis niloticus were conducted for three years in the middle River Niger. Scales were found to be the most suitable structure in ageing Heterotis which was validated by length/histogram curve. Annual rings were found to be formed between March to June. Growth was rapid in the first two years and they reached sexual maturity at 2 years. The male grow longer while the female are bulkier. The length-weight relationship of male and female Heterotis did not differ significantly and the resulting equation for male was W = 1.25L super(2.5) and W = 1.6L super(2.7) for females respectively where W = weight (g) and L = total length. The total length to body scale relationship was found to be L = 14.3R super(2.6) where (R = oral radius of scale Heterotis growth was found to be allometric

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