author(s)
Anju Kumari and Rupam Mallik

abstract
Damodar River near the coal washeries receive large amounts of contaminated water from the effluent points of various coal washeries. The present study was conducted to investigate the histopathological changes in the liver of fish species found in the Damodar River of Bokaro district. A comparative study was done by studying the liver tissue of freshwater fish of Damodar River water and the liver tissues of contaminated water through histopathological alteration due to changes in the various Physico - Chemical parameters which are not suitable for the survival of the fish species of Damodar River. Several histopathological alterations were found in the liver of the infected fish. The liver showed vascular degeneration in the hepatocytes. Also changes in the focal areas of Necrosis and Fibrosis was seen. There was aggregation of inflammatory cells between the hepatocytes. Formation of thrombosis was seen in the central vein. Dilation and congestion of blood sinusoids was also observed. In the present study fish species named Labeo rohita was taken for histopathological study of the liver tissues. After studying the changes or alteration in the liver tissues, it will be concluded that the coal washery effluents, sewage water and other pollutants have contaminated the Damodar River water and it induced several histological alterations in the liver of the fish species which are not suitable for human consumption and environment too.