Toxicity of Chromium on the Histopathological Changes in Gill and Liver of Fresh Water Fish Labeo rohita Fingerlings

The present study is aimed to assessing the toxicity of the heavy metal chromium on the histology of labeo rohita fingerlings was studied. The fingerlings were exposed for 10,20 and 30 days in 10% sublethal concentration of 96 hrs Lc5o of chromium (3.5ppm). During this period fishes were fed with artificially prepared food (on the 10th, 20th, 30th day fishes) were taken out, sacrificed and the tissues of gill and liver were excised out. The Gill exposed to sub lethal concentration of chromium showed mild histological study during 10 days, of exposure. After 30 days fusion of gill lamellae, hypertrophy and degeneration of epithelium is prominent. Liver lesions consisted of vacuolation, degeneration of hepatocytes and degeneration of cell boundaries of hepatocytes. These result showed that the degree of distortion of the gill concentration of the metals was found to be dose and time dependent. Effect of chromium on various biochemical and metabolic enzymes of gill and liver of fresh water fish Labeo rohita were observed. Histopathological changes in gill and liver of fresh water fish Labeo rohita undergoes heavy metal stress.