In the present study freshwater commercially cultivable catfish Clarias batrachus was used to evaluate the combined effect of lambda cyhalothrin, a synthetic pyrethroid and chlorpyrifos, an organophosphate insecticide widely used in agricultural fields. Clarias batrachus uses rice paddy slurries as its breeding and nursery grounds, inhabit sediments as they are benthic and are posed to greater threat from sediment associated toxic compounds such as pyrethroids and organophosphates mixtures which are widely used in rice fields today to control rice pests. The LC 50 of the combined mixture was found to be 0.05 mg/L. The fishes were maintained at one-fifth sublethal concentration of 0.01mg/L for a period of 30 and 45 days. Histological examination was carried out in testis and seminal vesicle at the end of exposure period to study the extent of damage at safe concentration.
Prof. Dr. Bilal BİLGİN