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Oxygen consumption, ammonia excretion and total ninhydrin positive substances in black clam Villorita cyprinoides (Pelecypoda) exposed to various salinities

Changes in the rate of oxygen consumption, ammonia excretion and the tissue content of total ninhydrin positive substances in the black clam, Villorita cyprinoides, were studied during the exposure of the animal to salinities 0, 5, 10, 15 and 20 ppt. The content of total ninhydrin positive substances was found to increase with an increase in ambient salinity, maximum concentration was found at 15 ppt. Rate of oxygen consumption also showed an increase with increase in salinity Rate of excretion of ammonia nitrogen decreased with an increase in ambient salinity. The role of ninhydrin positive substances in the osmoregulation is depicted and the existence of a degradation-synthesis balance for the regulation of osmotic effector pool is suggested.