Citation:Chandrasekera, L.K.H.U. and Pathiratne, A. (2005). Response of Brain and Liver Cholinesterases of Nile Tilapia,Oreochromis niloticus, to Single and Multiple Exposures of Chlorpyrifos and Carbosulfan, Environmental Contamination and Toxicology, 75(6): 1228-1233.