Bioaccumulation of Chromium, Lead and Cadmium in the bones and tissues of Oreochromis niloticus and Clarias camerunensis from Ikoli creek, Niger Delta, Nigeria
The discharge of wastes materials into the aquatic ecosystem could alter the physicochemistry of the water. This study evaluated the bioconcentration of heavy metals against two fresh water fish (i.e Clarias camerunensis and Oreochromis niloticus) from Ikoli Creek, Yenagoa, Bayelsa state, Nigeria. Samples were obtained from the creek between April and May 2012. The samples were analyzed using standard protocol. Results showed that in Clarias camerunensis, the concentration in bone and tissue are 0.028±0.001mg/kg and 0.018±0.000mg/kg respectively (cadmium), 0.625±0.004mg/kg and 0.218±0.006mg/kg (lead) and 7.776±0.006 mg/kg and 0.793±0.002mg/kg (chromium). While in Oreochromis niloticus the concentration in bone and tissue were 0.044±0.002mg/kg and 0.016±0.001mg/kg (cadmium), 0.525±0.001mg/kg and 0.486±0.006 mg/kg (lead) and 3.628±0.001mg/kg and 2.520±0.008mg/kg (chromium). The bioconcentration were in the order; cadmium<lead<chromium, which were highest in bones. The concentrations in this fishes were above the limit recommended by WHO. The high concentration of chromium in these heavy metals in the fishes suggests the occurrence in the Ikoli Creek.
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