1 Department of Forestry, Wildlife and Fisheries Management, University of Ado-Ekiti, Ekiti-State, Nigeria

2 Department of Wildlife and Fisheries Management, University of Ibadan, Ibadan, Oyo State, Nigeria


For the purpose of sustainable exploitation of the fishery resources of Oni River, Ogun State, Nigeria, the fish biodiversity assessment was carried out. This was conducted by enumerating and identifying fish species composition, measuring the fish length, fish weight, assessing the fish abundance and biomass, determining the length-weight relationships and the length-frequency of the fishes. Altogether, 592 fishes were sampled comprising twenty-eight (28) species belonging to sixteen (16) families. The families identified included: Cichlidae, Mormyridae, Clariidae, Channidae, Malapteruridae, Gymnarchidae, Bagridae, Mochokidae, Polypteridae, Pantodontidae, Schilbeidae, Anabantidae, Osteoglossidae, Characidae, Notopteridae and Distichodontidae. The family Mormyridae was the most abundant with 163 members followed by Cichlidae with 161 members. The least represented family was Schilbeidae with only two (2) members. On the species level, Tilapia zillii had the greatest number of representation with seventy (70) members, followed by Oreochromis niloticus with fifty-eight (58) members.


1- Akinola, A.O. (1982). Strategies for increasingFreshwater Fish Production in the Green RevolutionProgramme. In: Proceedings of the 2nd Conferenceof Fisheries Society of Nigeria, 25th -27th January,1982. Calabar. Pp 70-75
2- Akinyemi, O. (1987). Management of LakeEleiyele and Lake Asejire Fisheries: Application ofbionomic models. Ph.D. Thesis, University of Ibadan.Bagenal, T.B. (1978). Ecology of Freshwater FishProduction edited by Shell D. Garkling.
3- Bagenal, T.B. (1978). Ecology of Freshwater FishProduction edited by Shell D. Garkling.
4- FAO (1996). State of World Aquaculture
5- FAO (2000). FAO Fisheries Dept. Fishery CountryProfile Nigeria (English) FID/CP/NIR.
6- FDI (1981). Pocket map of the Federal Republicof Nigeria. Designed and produced by the Fed.Dept. of Information, Domestic Publicity DivisionIkoyi Road, Lagos, Nigeria.
7- Holden, M. & Reed, W. (1972). West AfricanFreshwater Fish Longman London.
8- Ita, E.O.; Sado, E.K.; Balogun, J.K.; Pandogan,A. and Ibitoye, B. (1985). Inventory Survey ofNigeria Inland Waters and their Fishery Resources.A preliminary checklist of Inland Water Bodies inNigeria with Reference to Ponds, Lakes, Reservoirsand major Rivers. KLRI Tech, Rep Series No 14New Bussa 1985.
9- Ita, E.O. (1993). Inland Fishery Resources ofNigeria. CIFA Occassional Paper No 20. RomeFAO, (1993). 120pp.
10- Ita, E.O.; Mohammed, A.; Omorinkoba, W.S.;Bankole, N.O. and Awojoodu, S. (1986). A PreliminaryReport on the immediate Post-impoundment FisherySurvey of Shiroro Res., Niger State, Nigeria. KLRI1985 Annual Report Pp. 25-29.
11- Olaniran, T.S. (2000). Ecological Evaluationand Sustainable Management of Fish Production inInternational Institute of Tropical Agriculture (IITA)Lake, Ibadan, Nigeria. Ph.D. Thesis, University ofIbadan.
12- Olaosebikan, B.D. & Raji, A. (1998). FieldGuide to Nigerian Freshwater Fishes. Federal Collegeof Freshwater Fisheries Technology, New Bussa,Nigeria, 106pp.