Concentration measurement of heavy metals mercury, lead and cadmium in fish muscle Tuna, Tap and tilapia in the city of Jiroft

Heavy metals can be serious threat to food security because of the ability to accumulte in the body of fish. Therefore, considering the important role of fish play in human nutrition, the concentration of heavy metals, especially in the edible part of the fish, is necessary. In order to investigate the concentration of heavy metals mercury, lead and cadmium in muscle tissue of three fish species, Tuna )Scomberomoruscommerson(, Tap)Thunnustonggol (and tilapia due (Oreochromisniloticus) 20 pieces of fish were randomly collected from fish sailes in Jiroft city in winter 2017. samples were prepared by acid digestion. Data analysis was performed using SPSS 19 software, ANOVA and t-test. The presence or absence of significant difference was determined at 5% level (P <0.05). The results showed that there is a significant difference between the accumulation of lead and cadmium in Tuna, Tap and tilapia muscle tissue (p <0/05) and the rate of lead accumulation in the tuna The concentration of mercury in the fish muscle tissue was lower than the global standard but the two metals of cadmium and lead in the tissues of Tilapia and tap were higher than the global standard. Key words: Jiroft, Cadmium, Heavy metals, food chain.