Evaluation of Bioaccumulation of heavy metals (cadmium, lead and zinc) in edible muscle tissue of crucian carp (Carassiu sauratus) from international wetland of Anzali

Crucian carp (Carassiu sauratus) is one of the economic species of Anzali wetland. In recent years, the demand of high consumption was found, because of its low price and high level of catch. This study focused on accumulation of heavy metals(Cd, Pb and Zn) in the edible tissues of Crucian.Sampling were done in 3 stations (West,Center and East) of Anzali wetland in 1391. In this study 10samples were collected from each site in the standard weight by grill net, randomly. After separation of tissues, preparing of samples were conducted by using of wet digestion method and mixed acid (HNO3/HCLO4).After filtration, the prepared samples were determined for Cd, Pb and Zn by using a flam atomic absorption spectophotmeter (AA),SHIMADZU model 680.The levels of metals were compared with the standard of American Food and Drug Administration (FDA) and the world Health Organization (WHO). The average concentrations of cadmium in the soft tissue of crucian were 0.07, 0.05 and 0.05 μ g / g dry base for West, East and Center of Wetland. For Zinc, average concentrations for West,Center and East were 58.45, 46.4 and 49.7 μ g / g dw, respectively. The result showed that,there were not significant differences (P>0.05) between stations about the Cadmium, Lead and Zinc in the tissues of Crucian. Concentrations of Pb and Zn were higher than of standars levels of WHO and FDA.