mohammad mehdi saeedi

Heavy metals are one of the most important polluting sources of aquatic ecosystems, so the contamination of fishes with heavy metals, such as cadmium, can lead to their bioaccumulation in the body of consumers and ultimately the occurrence of various dangerous diseases. The aim of this research was to evaluate the amount of cadmium concentration in the rainbow trout, marketed in Birjand, Iran. For this purpose, a total of 96 samples of muscle and gill tissues of rainbow trout (48 fresh and frozen fish gill tissue samples and 48 fresh and frozen fish muscle tissue samples) were tested. Samples were prepared by wet digestion method and cadmium concentration was measured using graphite furnace atomic absorption spectrophotometer. After the statistical analysis of the data the mean value of cadmium in all samples was measured 0.007±0.003 ppm. The amount of cadmium in gill tissues was higher than in muscle tissues, but this difference was not statistically significant (p<0.05). In addition, the average concentration of cadmium in muscle and gill tissues were significantly lower than international standards (p>0.05). he results of this research showed that, fortunately the rainbow trout marketed in Birjand city is in a favorable condition in terms of the cadmium concentration.