International Journal of Fisheries and Aquatic Studies

Volume 2, Issue 2, 2014


Length-weight relationship, condition factor, length at first maturity and sex ratio of Nile tilapia, Oreochromis niloticus in Lake Naivasha, Kenya


Author(s): Outa N. Otieno, N. Kitaka, J.M. Njiru

Abstract: Fish samples (541) were collected every two weeks from different parts of Lake Naivasha using gill nets (50 mm to 150 mm mesh size) and beach seines (< 10 mm) between November 2013 and February 2014.The main focus of the study was on sex ratio, length-weight relationship and body condition of Nile tilapia.  Results revealed that there were more males sampled with a sex ratio of male to female of 2:1. A comparison of the length-weight relationship for males and females showed that most of the fish had negative allometric growth (b <3) with males from Oserian and Hippo sampling stations point showing isometric growth (b =3). Length at first fish maturity of male and female fish obtained during this study was 17.7 cm TL and 18.0 cm TL respectively. The results from this study showed that fish in the lake are in good condition with condition factor value above 1.

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