J.C. KALITA, B.K. BARUAH*, R. AHMED*, S.K. CHOUDHURY* AND M. DAS**
Abstract
All types of domestic, municipal and industrial waste together constitute the city sewage. It is highly polluted with regards to physical, chemical and biological characteristics. In the present experiment, fish Heteropneustes fossilis was exposed to the sewage of Guwahati City for a period of 180 days and the liver histology was studied after every 30 days interval. The liver exhibited marked change in the histopattern showing gradually increase in liver damage including vacuolation, degeneration, haemorrhage and fibrotic change in liver cells.