TOXICITY OF OIL EFFLUENT ON OXYGEN UPTAKE, FILTRATION RATE AND GLYCOGEN IN Lamellidens marginalis...

Lamellidens marginalis, a freshwater bivalve, was exposed to sublethal concentrations of oil effluent in order to examine the filtration rate, oxygen uptake, and glycogen level of foot, gill, and digestive gland tissues for healthy assessment for reuse in oil effluent intoxicated aquatic environments. The treated group's oxygen intake was higher than the control group's in 1/4th and 1/10th exposures, peaking at 48 hours and subsequently declining. Oil effluent exposure concentrations gradually increased, peaking at (205 68.344 ml oxygen/hr) 72 hours in 1/4th and (172 57.346 ml oxygen/hr) 42 hours in 1/10th concentrations, followed by a modest fall. Oil effluent uptake peaked at 84 hours in 1/4th foot tissues (512170.675 g g-1); 1/10th foot tissues (498166.014g g-1); 1/4th gill tissues (516172.013 g g-1); 1/10th gill tissues (464154.69g g-1) and 1/4th digestive gland tissues (540180.012 g g-1); 1/10th digestive gland tissues (522174.03 g g-1) of Mean glycogen concentrations in foot tissues ranged from 1.934 mg to 3.262 mg/g wet tissue in 1/4th and 2.318 mg to 3.286 mg/g wet tissue in 1/10th of sublethal exposures; 1.705 mg to 3.579 mg/g wet tissue in 1/4th and 2.324 mg to 3.074 mg/g wet tissue in 1/10th of exposures in gill tissues; and 1.852 mg to 3.314 mg/g wet Our findings suggest that the freshwater bivalve L.marginalis can be employed as indicators for animal health assessment, opening up new avenues for research into freshwater mussels' energetic reserves and health status.

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