Organochlorine pesticide residues in five fish speciesin the vicinity of lake chad, baga, Nigerian sector

This study was carried out to determine the concentration levels of some Organochlorine Pesticides(OCPs), dichlorodiphenyltrichloroethane (DDT), isomers of hexachlorocyclohexane (HCH) (alpha, beta, and delta HCH), lindane, Endosulfan I, Endosulfan II, Endosulfan sulphate, dieldrin, Permethrin, Heptachlor, Lambda-cyhalothrinand aldrin, in five fish species (Clarias gariepinus, Clarias anguillaris, Heterotis niloticus, Oreochromis niloticm, and Tilapia zillii) in the vicinity of Lake Chad, Baga, Nigerian sector. The OCP residues were analyzed using Gas Chromatography. The concentrations of OCP residues in fish species ranged between Endrin (0.0003 mg/kg) in T.zillii at Dunmba I. to delta HCH (4.677 ± 0.05 mg/kg) observed in T.zilli at Dumba 2 The dominant pattern of OCP residues accumulated by fishes followed this order, delta HCH>Endrin>EndosulfanI˃Permethrin˃ Endosulfan II. The accumulation pattern of OCP residues by the fishes was as follows T.zillii>C.gariepinus> H. niloticus>C.anguillari>O.niloticuss. The mean concentration levels of OCP residues in the fishes were within the permissible limits of FAO/WHO (2005).