“…Purification and Properties of a Protease from the Gut of Etroplus suratensis BY SAROJA SUNDARAM AND P. S. SARMA* University Biochemical Laboratory, Madras 25, India (Received 26 April 1960) The proteases of fishes form a group in the field of proteolytic enzymes where relatively little work has been undertaken. Generally, investigations have been carried out hitherto on the distribution of proteolytic enzymes in various fishes, particularly in their digestive tracts (Buchs, 1954;Hamoir, 1955). However, purification of these enzymes appears to have been done only to a limited extent.…”