Abstract: Bio-concentration of heavy metals pollution in water and fish was investigated in Majidun River, Lagos, Southwest, Nigeria. Water and three commercially available fish species (Chrysichthys nigrodigitatus, Sarotherodon galilaeus and Hemichromis fasciatus) were collected for 15 weeks (October, 2013 to January, 2014) and five organs from each fish were used. All the water and fish samples collected were subjected to heavy metals analysis using Atomic Absorption Spectrophotometer (AAS) in accordance to standard analytical methods. Data obtained were subjected to statistical analysis (ANOVA) to find out the significant difference of heavy metals in the water body throughout the sampling period and in each organ of the sampled fishes. There was variability in the concentrations of heavy metals in the river body which may be as a result of different natural and anthropogenical activities that might make the river to be unsafe for human consumption. Lead and Cadmium across the organs were not significantly different (p > 0.05) to each other while iron, manganese and zinc were significantly different (p < 0.05) across all the organs, except in liver and heart. Highest metal accumulation occurred in descending order as H. fasciatus > S. galileaus > C. nigrodigitatus and all the fish species accumulated highest in descending order as Fe > Zn > Cr > Pb > Mn > Cu > Cd. It was found that fish from this study area accumulated essential heavy metals (Fe, Zn, Cr, Mn) in their body in higher concentrations than non-essential ones (Pb, Cd, Cu).
Keywords: Bio-concentration, Majidun River, Heavy Metals, Human Activities, Fish.
Title: Bio-Concentration of Heavy Metal Pollution in Water and Fish of Majidun River, Southwest, Nigeria
Author: OLADUNJOYE, R.Y., FAFIOYE, O. O
International Journal of Life Sciences Research
ISSN 2348-313X (Print), ISSN 2348-3148 (online)
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