Impact of pesticide cypermethrin on haematological alterations in the freshwater fish oreochromis mossambicus

Pesticide is common pollutants of freshwater ecosystems where they induce adverse effects on the aquatic biota. Fish, Oreochromis mossambicus is an important carp species in Tamil Nadu region having good nutritional values. Fishes living in close association with may accumulate pesticides. In the present observation, the toxic effects of pesticide cypermethrin LC50 0.28 ppm on the total RBC, WBC, Hb and MCH in the fish, Oreochromis mossambicus were estimated. The sublethal concentrations of pesticide cypermethrin on (10% sublethal concentration and 20% sublethal concentration) showed a decreasing trend in the RBC, Hb and mean corpuscular haemoglobin (MCH) compared to controls and the WBC analysis revealed a significant increased compared to control for a period of 10, 20 and 30 days exposures. The results indicated the toxic nature of the sublethal concentrations pesticide cypermethrin.