Determination of Heavy metals(Co, Cr) inMuscle,Skin and Gillof Tissues Chalcalburnus chalcoides in South of Caspian sea( Anzali lagoon and shirud)

The concentration of heavy metals Cd, Co were investigated in the Gill, Skin and Muscle tissues of Chalcalburnus Chalcoides Caught in Spring 2012 from in south of Caspian sea (Anzali lagoon &Shirud)in Gilan and Mazandaran province..  After biometrical measurements the Gill, Skin and Muscle tissues of samples were separated; metals were measured by chemical digestion method with pure nitric acid and their concentrations were determined by AAS .Mean concentrations ppm/ dry weigh)were compared with the international standards  such as WHO, FAO and Stoskopf. The mean concentration for Cr in all tissues except in muscle tissue in both stations higher than the WHO standard and Stoskopf limit was recorded. The concentration Co in comparison with international standards FAO in Anzali lagoon were found higher than permissible limit. Also average accumulation of Cr in Muscle, Skin and Gills tissues had significantly different in two provinces (P< 0.05). Average accumulation of Co in Muscle, Skin and Gills tissues was not significantly different in two provinces (Gilan&Mazandaran)(P>0.05 ).Average accumulation of Cr and Co in muscle, skin and gills tissues were not significantly different between two provinces (P>0.05).