Histopathological effect of the pesticide Lindane in the Gill tissue of the freshwater fish, Cyprinus carpio.

S.Binukumari* and Vasanthi.J   
PG and Research Department of Zoology, Kongunadu Arts and Science College, Coimbatore, TamilNadu

Abstract
A thorough knowledge of normal histology is essential for the understanding of the altered structure seen in the various conditions of disease. The off target movement of chemicals used in industry and agriculture are usually unavoidable, these chemicals get into natural water and may cause significant tissue damage in fish. Generally industrial wastes includes a wide variety of chemicals all of these chemicals of industrial waste are toxic to animals and may cause death or sub lethal pathology of liver, kidneys, reproductive system, respiratory system or nervous system in both invertebrate and vertebrate aquatic animals. Histology acts as an integrated parameter, providing a more complete evaluation of the organisms’ health, effectively monitoring the effects of exposure to environmental pollutants. The median lethal concentration (LC ₅₀) of Lindane to fish Cyprinus carpio for 96 h was found to be 0.32 ppm. In sublethal concentration (1/10^th of LC ₅₀ 96h value, 0.032 ppm) fishes were exposed for 10 days, 20 days and 30 days. Histopathological lesions were noted in the gill tissue when compared to the control.
Keywords: Histopathology, Pesticide, lethal concentration, gill