Measurement of Ni in muscle of Rachycentron canadum in west northern waters from Persian Gulf

This study evaluated and compared the accumulation of Ni in the muscle tissue of fish Cobia (Rachycentron Canadum) and its relation to total length, total weight and age of the fish in the waters of the northwest of Persian Gulf in 2014. Ninety six fish samples were collected at 6 length groups. To measure the level of essential elements, the samples were digested by wet digestion method and by Perkin Elmer 4100 AAS instrument. The means were compared using analysis of variance (ANOVA) and correlations and significant differences were estimated at 95% significance level. Mean concentration of Ni in the muscle tissue of Rachycentron Canadumwas 0.148±0.05 mg/kg dry weight (P<0.05). The highest concentration of Ni was found in the group with larger than 127 cm length (0.238±0.9 mg/kg dry weight). A positive correlation was established between the total length and total weight and age and accumulation of Ni at P. Concentrations of Ni in muscle of Rachycentron Canadum were lower than international standard of WHO (0.38 mg/kg).