ROLE OF CEREBRAL GANGLIA IN REGULATION OF OXYGEN CONSUMPTION OF FRESHWATER BIVALVE MOLLUSC, INDONAIA CAERULEUS (PRASHAD, 1918) FROM GODAVARI RIVER DURING SUMMER

Abstract

The adult bivalve mollusc, Indonaia caeruleus of 50-53 mm shell length and 6.853-8.275g body weight were subjected to (a) control (normal) (b) removal of both the cerebral ganglia, (c) injection of their cerebral ganglionic extract to intact control as well as (d) injection of ice-cold distilled water and absolute alcohol (1:1) to normal control and (e) injection of this extract to ganglia removal bivalves for 10 days. The rate of oxygen consumption in bivalves from all four groups (including control) was measured on 2nd, 5th and 10th day. The study revealed that, the rate of oxygen consumption was significantly increased in cerebral ganglia removed, as well as cerebral ganglionic extract injected to ablated group on 2nd, 5th and 10th day compared to control. The rate also showed significant increase in injection of extract to normal control on 2nd day. The rate of oxygen consumption showed more increase in cerebral ganglia ablated group than extract injected one on 5th and 10th day. The results are discussed in the light of possible involvement of endogenous regulation in bivalve shell fishes.