Monitoring of organochlorine pesticides and polychlorinated biphenyls in three edible fish species of Anzali wetland

Organochlorine compounds such as، polychlorinated biphenyls and organochlorine pesticides are among the best known classes of contaminants because of their potential for magnification and harmful biological effects. In this study، the amounts of organochlorine pesticides including D. D. T and its metabolites، α، β and γ-HCHs isomers، Σcyclodiene (Endosulfan، heptachlor، heotachlor epoxide، aldrine and dieldrine) together with polychlorinated biphenyls congeners (28، 52، 101، 118، 138، 152 and 180) were determined in the three fish species (Esox lucius، Cyprinus carpio and Carassius auratus) in Anzali wetland in two seasons (winter and spring). The results indicated that contaminant concentrations generally followed the order: D. D. T > Σcyclodiene > HCHs > PCBs. β-HCH، Endosulfan and p،p/-DDE were the most abundant OCPs while PCB-153 were predominantin in PCB congeners in three species. In samples of both seasons OCPs (agricultural pesticides) concentrations were higher than PCBs (industrial poisons). Moreover in spring samples the mean OCPs and PCBs concentrations were higher than in winter.