OXYGEN CONSUMPTION AND TISSUE ORGANIC CONSTITUENTS IN DIFFERENT BODY PARTS OF FRESHWATER BIVALVE MOLLUSC, INDONAIA CAERULEUS (PRASHAD, 1918) EXPOSED TO RISE IN TEMPERATURE DURING MONSOON SEASON

In the view of the reported metabolic shifts in the bivalve shellfishes during changes in the environmental conditions, we report here the changes in the oxygen consumption of whole animal and levels of organic constituents from mantle, hepatopancreas, gonad and foot of freshwater bivalve mollusc, Indonaia caeruleus (47-5 l mm in shell length) upon exposure to rise in temperature (30°C) for 15 days during monsoon (August-September). Compared to the normal temperature (25.5°C-26.0°C), the rate of oxygen consumption was increased on 2", 8" and 16" days. The rate was significantly increased on 16" day. Regarding alternation in the organic constituents, the protein content significantly decreased almost from all the tissues on 2" day, from hepatopancreas and gonad on 8" day and from mantle on 16" day. The glycogen content also significantly decreased from all tissues on 2" day, whereas it was significantly increased from mantle and decreased from gonad on 8" day, but significantly decreased from mantle and foot on 16" day. The lipid content significantly increased from mantle and gonad on 2" day, significantly decreased from hepatopancreas and increased from gonad on 8" day, while it was significantly decreased from mantle on 16" day .It was ferther seen that the protein content decreased more from the gonad followed by mantle, the glycogen content increased more from mantle tissue on 8th day than other tissues while the lipid content was more increased on 2" and more decreased on 16" day from the mantle. The results are discussed in the light of metabolic shifts in the bivalve molluscs due to temperature.