Sublethal effect of copper on plasma constituents of Cirrhinus mrigala and Ctenopharyngodon idella.
The measurement of serum/plasma parameters is of significance in assessing the nutritive value of cultivable fishes, in the light of drawing waters from contaminated sources and employing biocides containing heavy metals in culture ponds. The main objective of this study was to determine the sublethal effects of copper (0.16 mg/l Cu and 0.53 mg/l Cu) on plasma glucose, total protein, albumin, globulin, total cholesterol and triglycerides in an endemic carp Cirrhinus mrigala and an exotic carp Ctenopharyngodon idella at weekly intervals, over a period of four weeks. Glucose, albumin, total cholesterol and triglycerides were estimated by enzymatic methods and total protein by non-enzymatic method. Glucose level has elevated on day 14 and then returned to levels comparable to those of control fish. The result of this study revealed that total protein, albumin, cholesterol and triglycerides indicated a positive linear relationship with the duration of exposure. Globulin expressed an intermittent rise and fall till the end of the experiment. All parameters, other than glucose and globulin, showed a gradual decrease with increasing exposure period.