The survey on concentration of lead and zinc in liver and muscle tissues in two species of the farmed fishes Cyprinus carpio and Oncorhynchus mykiss

The heavy metals are the pollutants that create too much problems in aquatic ecosystemsfor aquatics and human. In this study, the concentration of heavy metals Lead and Zinc inmuscle and liver tissues of in Cyprinus carpio and Oncorhynchus mykiss was calculatedin 2008. Thirty-six fish samples was randomly collected from Sarcheshmeh market inTehran. Heavy metals were extracted from tissues using wet Digestion method andconcentration were measured by Atomic Absorption Spectrophotometer Philips PU9400X. The highest concentration of Pb and Zn in the muscle and liver of Oncorhynchusmykiss were 0.66±0.06 and 67±8.18 mg/Kg. The lowest concentration of Pb and Zn in the liver of Oncorhynchus mykiss (0.17±0.01) and in the muscle of Cyprinus carpio (0.15±0.02) mg/Kg was determined. Lead concentration in the muscle of two fishes were more than those in liver. However, zinc concentration in liver was more than muscle (P≤0.05). Lead and zinc concentration were lower than WHO’s standard.