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ABSTRACT
This Research work was conducted to determine the concentrations of some selected heavy metals namely Zinc (Zn) and Lead (Pb) in clarias gariepinus using river water sample from Ogba and Amagba River in four different contaminated laboratory simulated microenvironments. Water samples from Ogba and Amagba River were spiked with different concentrations (10 ppm, 5 ppm, 1 ppm) of the heavy metal and a control environment. The fish samples were analyzed for Pb and Zn after acid digestion by using atomic absorption spectroscopy (AAS). The results obtained showed that the concentration of heavy metal in clarias gariepinus using Ogba river water sample ranges from 4.43mg/kg to 7.82mg/kg for Pb and 4.85mg/kg to 5.87mg/kg for Zn. Using Amagba river water sample, the concentration of heavy metal ranges from 4.97mg/kg to 8.52mg/kg for Pb and 5.49mg/kg to 6.00mg/kg for Zn. The results also showed higher lead uptake in some of the simulated environments except control and 1ppm for Ogba River. It showed that lead is slightly lower than zinc in the first 2 groups (control & 1PPM) and higher than zinc in the other groups for Amagba River water. The analysis of variance (ANOVA) showed that there is significant difference in both heavy metals (Zn and Pb) at all concentrations except for Control Zn and 1ppm Zn group whose difference is not significant for both Ogba and Amagba River. The concentrations of zinc were below the World Health Organisation (WHO) permissible level for fishes, while the concentration of Lead were above the (WHO) permissible values, thus constituting potential health hazards to consumers of this fish species in the study area.
