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Abstract
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.