Differential bioaccumulation of heavy metals in selected biomarkers of Clarias gariepinus (Burchell, 1822) exposed to chemical additives effluent
2012
Dahunsi, S. O. | Oranusi, S. U. | Ishola, R. O.
The toxicity of Sublethal concentrations of chemical additives effluents were investigated on African catfish Clarias gariepinus using a renewable static bioassay. The trend of bioconcentration of metals in the gut, liver, gills and kidney of the test organisms differs significantly (p < 0.05) and it followed the order, liver> gill >gut > muscle. The result revealed that the liver had Ni concentration of 0.0046 mg/L and 16.1208 mg/L of magnesium as the highest. In the muscle, Ni was not bioaccumulated (0.0000 mg/L) while the highest magnesium concentration of 10.7345 mg/L was recorded. The gill had the least concentration of 0.0010 mg/L for Cu while the highest concentration recorded for Mg was 12.6797 mg/L. The gut had Mn concentration of 0.0401 mg/L and Mg concentration of 14.5001mg/L. It was revealed that fish can bioaccumulate heavy metals from a polluted environment, which may result in reduction or impairment of natural population size and could be a risk to consumers. Consumption of fish from polluted environment should be discouraged.
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