HEAVY METAL (COPPER AND MERCURY) INDUCED ALTERRATIONS IN THE ENZYME SECRETORY ACTIVITY OF HEPATOPANCREAS OF A FRESHWATER BIVALVE CORBICULA STRIATELLA.S. P. Zambare and A. Y. MahajanAbstract Fresh water bivalves Corbicula Striatella were exposed to acute and chronic doses of mercuric chloride, and coppe sulphate. After certain interval the actvities of digestive enzymes such as amylase, protease and lipase were studied from the hepatopancreas. Progressive decease in amylase and lipase activity in the hepatopancreas was observed in heavy metal exposed bivalves. The decrease in enzyme activty indicate poor secretion of enzymes by the digestive gland which may be due to damage caused by heavy metals to the secretery cells of hepatopancreas. The protease activity was Increased after heavy metal stress which can he due to the increased lysosomal proteases.
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