Ero Dam is noticed to be exposed to several cases of abuse from human activities judging from preliminary studies of its quality assessment. Therefore, this research aimed at evaluating the impacts of human activities on some qualitative attributes of the dam using standard laboratory procedures. The physicochemical attributes of the dam water established that most of the parameters were statistically higher (p<0.05) than the National Environmental Standards and Regulations Enforcement Agency’s specification for maximum limits allowed for discharge into surface water for all categories of industries. The concentrations of metals in the whole body mass of the three sampled fish species (Oreochromis niloticus, Tilapia mosambis and Clarias gariepinus) were higher than their values in water. The proximate composition of the body muscle of the three fish species analysed proved the fishes to be nutritionally suitable for consumption but the additive effects of the metals in the water samples should be a point of concern to public health. The three Fish species studied were heavily parasitized, with high parasitic prevalence and intensity probably as a result of the presence of pollutants in Ero Dam. Conclusively, indiscriminate abuse of Ero Dam impaired the quality of water.

Keywords: Nutritional Fitness, Parasitism, Oreochromis niloticus, Tilapia mosambis and Clarias gariepinus