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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 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 short rains, respectively, in Kenya.
Acknowledgements
This study was supported through the Kenya-Belgium Inter-University Cooperation Programme (VLIR-IUC-UON) and University of Nairobi to whom we are extremely grateful. We also wish to thank the Fisheries Department, Kenya and Lake Naivasha Riparian Association for being very supportive during the study. John Mutembei assisted dedicatedly in finalizing the draft paper.