ANALYSIS OF HEAVY METALS IN THE CATFISH SPECIES: Clarias gariepinus

Abstract

Pollution and degradation of our nation’s aquatic ecosystem is on the increase due to anthropogenic activities. In this study, the levels of heavy metals accumulated by catfish: Clarias gariepinus, obtained from two communities in the oil rich region of Escravos in Warri South–West Local Government Area of Delta State, Nigeria, were determined using Atomic Absorption Spectrophotometer (AAS). The results indicated that heavy metal concentrations in catfish species ranged from 0.115 to 0.220mg/kg for Arsenic, 0.221mg/kg for Cadmium, 188.200 to 194.560 mg/kg for Iron, 0.600 to 12.590mg/kg for Selenium and 125.000 to 135.000mg/kg for Zinc. Lead and mercury concentrations were below detectable limits in the samples. The concentrations of cadmium and selenium were above standard limits set by regulatory bodies. There was significant difference (p<0.05) in the concentrations of Arsenic and Selenium accumulated by the catfish from Ajudaibo and Madagho. Regular monitoring and assessment of fishing sites in Escravos region to ensure safety of consumers are advocated. Key words: Catfish, Escravos, Ajudaibo, Madagho, Heavy metals, Clarias gariepinus,Concentration