10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 3 2013 (July - September) The electrophoretic banding patternof esterases were examined in six different tissues of lessThan i greaterThan Pomacea paludosa lessThan /i greaterThan and lessThan i greaterThan Pomacea canaliculata lessThan /i greaterThan by using different inhibitors viz: pCMB, Paraoxon, Physostigmine, EDTA and AgNo3. Same esterolytic active zones were observed in Ctenidia and Mantle of both species, the maximum number of bands exhibiting in Ctenidia of lessThan i greaterThan P.paludosa lessThan /i greaterThan and lessThan i greaterThan P.canaliculata lessThan /i greaterThan . Species specific differences were observed in some of the regions. Striking substrate – specific reactions were not observed, but based on sensitivity to inhibitors, the tissue esterase of both species classified in to CE, ER, AcE, ArE, AcE and Esdp esterases. P. SWAPNA AND T.RAVINDER REDDY Electrophoresis, inhibitor, Physostigmine, esterolytic, dextranase enzyme. 1000-1006