بررسي ميزان تجمع روي و مس در بافت عضله و خاويار تاسماهي ايراني و ازون برون حوضه جنوبي درياي خزر

Determination of Zn and Cu in muscle tissue and caviar in Persian sturgeon (A. persicus) and stellate (A. Stellatus) in The Caspian sea basin

The concentrations of heavy metals zinc (Zn) and copper (Cu) were determined in muscle tissue and caviar in two sturgeon species A. persicus and A. stellatus caught in the five fishery zones in the southern Caspian Sea basin (extending from Astara Port to the Torkman Port). The samples studied included 139. A. stellatus specimens and 103 A. persicus specimens that were caught during the catch seasons in 1998 and 1999 from the 18 catch stations located in the five fishery zones. Specimens for chemical analysis were digested using the wet method (13, 14) and the concentrations of heavy metals were determined using Atomic Absorption Spectrophotometer (flame method). The mean age recorded for fishes studied was 17.6±2.6 years in A. persicus and 11.9+1.8 years in A. stellatus. The mean concentrations of Zn and Cu in muscle tissue inthe five fishery zones were 26.98.5µ.g/g and 1.8±0.7µ.g/g dry weight, respectively in A. persicus and 47.4±6.96µg/g, 1.46+0.53ug/g, respectively in A. stellatus. Themean concentrations of Zn and Cu in caviar speciemes studied were 65.9±16.7 µg/g and 4.2±1.07µg/g dry weight, respectively in A persicus and 57.8±10.57µg/g and 4.85±1.15µg/g dry weight, respectively in A. stellatus.