Effect of commercial hormones and ganglionic extract injections on glycogen metabolism in freshwater bivalve Indonaia caeruleus (Prashad, 1918) during summer season

Considering the importance of neuroendocrine control on the metabolic activities of freshwater bivalves, we report here the effect of injections of cerebral ganglionic extract and equivalent commercial hormones (Progesterone & Estradiol) on glycogen metabolism of freshwater bivalve mollusc Indonaia caeruleus (Prashad, 1918) from Godavari River. During summer season, the adult bivalve mollusc, Indonaia caeruleus (50-55 mm shell length) were subjected to the five respective experimental groups are as follows- 1) injection of commercial hormone progesterone 2) injection of ganglionic extract 3) injection of sham operation 4) injection of estradiol and 5) control (normal) for 10 days. The glycogen estimation in bivalves from all four groups (including control) was measured on 3rd, 6th, and 9th day. The study revealed that, the glycogen content was significantly decreased from mantle in progesterone and from mantle as well as gonad in ganglionic extract and estradiol injected group on the 3rd day. The content of glycogen also showed significant increase from mantle, hepatopancreas and gonad more in progesterone, ganglionic extract injected and slightly in estradiol injected animals on 6th day. Whereas the content of glycogen on 9th day increased significantly in mantle of ganglionic extract injected and mantle as well as gonad in estradiol injected group.