School of Biological Sciences, University of Nairobi, P.O Box 30197- 00100 Nairobi, Kenya

*Corresponding author: mjntiba@uonbi.ac.ke

Abstract

   The objective of the study was to investigate some aspects of the breeding patterns of the cyprinid Barbus amphigramma in Lake Naivasha. The study was carried out from February to October, 2003. Fishing was done with the use of gillnets of mesh size 0.5 inch to 3 inch and a beach seine of mesh size 1 inch. Six gonad maturity stages have been described visually, based on morphological features, and validated by histological features of the ovary as well as examination of the oocyte diameter. Females dominate the population at all sizes classes. Barbus amphigramma spawns all the year round but with discernible peaks in March, July and October. The peaks in March and October correspond with the beginning of the long and the short rains, respectively, in Kenya.