Authors : J. S. Maske
Page Nos : 163-167
Description :
Abstract:
In aquatic ecosystems, pesticides enter the food chain, accumulate in non-target organisms and increase in animal tissue to alarming concentrations. They are intentionally toxic to organisms. They caused adverse impacts on aquatic fauna including fish. The present study was carried out to investigate the histopathological effects of the insecticides quinalphos and cypermethrin on skin of the fresh water fish, Heteropneustesfossilis. The fishes were exposed to the sublethal concentrations (1/5th of 96 hr LC50) of these insecticides for 4, 15, and 30 days. The histopathological alterationsobserved in the skin were severe as compared to control. The changes included spaces in between the epidermal tissues, club cells reduced in numbers, mucous cells lost their identity, muscle bundles reduced in numbers, separation of dermis layer from epidermis, blood vessels damaged and blood cells came out of vessels and spreaded.The fish exposed to cypermethrin exhibited more damage in skin than those exposed to quinalphos.
Keywords: Histopathology, skin, Heteropneustesfossilis. quinalphos, cypermethrin.
