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Abstract

ABSTRACT:The scaling of metabolic rates with body mass is one of the best known and most studied characteristics of aquatic animals. We studied here how size is related to oxygen consumption, ammonia excretion and O: N ratio in Freshwater Bivalve Mollusc Lamellidens marginalis species in an attempt to know how size specific changes affect their metabolism. The freshwater bivalve molluscs with specific size i.e. small (77-79 mm in shell-length) and large (90-93 mm in shell-length) were selected for experimental work from Bhima River at Siddhatek on December and January during winter. The adult bivalve molluscs with small size reported high value in oxygen consumption and O: N ratio but ammonia excretion was low value in small sized bivalves compared to large ones.The results are discussed in the glow of metabolic processes in fresh-water bivalve molluscs. In bivalve molluscs, the relationship between the rate of ammonia excretion and the body size can be variable due to a disproportionate reliance of protein catabolism for energy production [7,8]. [9] Stated that in bivalve molluscs the relationship between ammonia excretion rates and body size can be variable due to a disproportionate reliance on protein catabolism for energy production by small MATERIALS AND METHODS During RESULTS AND DISCUSSIONDuring study period, the physico chemical parameters like temperature, pH, hardness and dissolved oxygen content of habitat water of bivalve Lamellidens marginalis and the experimental water (tap water), were determined during experiment ( Table 1). The temperature of water of collection sites was (18.1 -20.8ºC) on December and (17.5 -20.3ºC) on January and also temperature of the tap water was (19.6 -23.0ºC) on December and on January it was (18.6 -21.8ºC). pH was found on December (7.92-8.10) and on January (8.10 -8.38) in habitat water and also in tap water was (7.55 -8.50) on December and on January (7.50 -7.70). The hardness of water was found on December on December and (274.0 -280.6 ppm) on month of January. The dissolved oxygen contents of the water was on December (4.8620-4.6220 mg/lit/hr) and on January (6.2178-6.5132 mg/lit/hr) whereas in tap water was (3.7620 -3.7620 mg/lit/hr) on December and on January (4.8177-4.8177 mg/lit/hr).