Turkish Journal of Fisheries and Aquatic Sciences
2008, Vol 8, Num, 2 (Pages: 289-292)
Preliminary Observations on Fish Species in a Newly Impounded Osinmo Reservoir
Olusola Olaniyi Komolafe 1 ,Gabriel Augustine Omosola Arawomo 1
1 Obafemi Awolowo University, Department of Zoology, Ile-Ife, Nigeria
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The present study examines the diversity of fish species in the recently impounded Osinmo reservoir. Fish samples
were caught by cast netting, gill netting and trapping. Four families of fish comprising seven species were identified. The
family Cichlidae comprises 59.6% of all the fish caught in the reservoir, while the least of 6.3% was Hepsetidae. The relative
abundance of fish species showed that Tilapia zillii had 28.8% of all fish caught. Except for Hemicromis fasciatus, the males
of all other fish species showed abundance over the females. The abundance of males over females was only significant in
Channa obscura, Sarotherodon galilaeus and Clarias gariepinus. High water parameters observed in the reservoir is an
indication of stability which augurs well for better reproductive activities and a high production of plankton which is a source
of food for fish.
Keywords :
Fish diversity, relative abundance, sex ratio and water quality