Measurement of Mercury Metal Contamination in Muscle Tissue of Carp (Cyprinus Carpio) and Duck (Esox Lucicus) Anzali Wetland and Its Correlation with Weight, Age and Diet

Heavy metals and quasi-metals are among the stable and decomposing elements that threaten their health and human health if there are high concentrations in aquatic tissues. This study was conducted in 2017 with the aim of measuring the level of mercury metal contamination in the oral tissue of carp and duck fish in Anzali wetland, comparing it with the allowable limit of international standards and also examining the correlation between age, weight and diet with the level of contamination of this toxic element. Fish samples were collected from three parts of east, center and west of Anzali wetland. Mercury was measured with an advanced mercury analyzer (Leco AMA 254) according to the EPA6722D-standard method. The mean total concentrations of this metal in carp and duck muscle tissue were measured to be 0.598 and 0.5762 μg / kg dry weight, respectively. A significant linear positive correlation (p <0.001) was observed between mercury accumulation and age and weight of the two species. There was a significant difference between the concentrations of mercury in the muscle tissue of the two species. In general, the amount of mercury in the muscle tissue of fishermen was significantly higher than non-fisherman. The highest concentration of mercury was observed in the samples of the eastern part. A comparison between the concentration of mercury in the two fish and the US Food and Drug Administration's standard threshold for mercury (1 μg / g) shows that the results are below the threshold, while the threshold set by The World Health Organization and the Food and Agriculture Organization (FAO) are more.