In this study, the levels of organochlorine (OC) pesticide residues in Lake Tashk have been investigated using water, sediment and fish (carp) samples as a case study to find out the extent of pesticide contamination and accumulation in the lake. Six OC pesticides namely DDT, DDE,lindane, endosulfan, heptachlor and chlordane were analyzed in four sites at four seasons. Water samples were proces…