In the present study, the two lakes, Vengaiah lake (Lake A-Sewage polluted receiving discharge from storm water drain) and Yellamallappa Chetty lake (Lake B-Industrially polluted) situated near Krishnarajpuram-Hoskote taluk, Bangalore, Karnataka were selected for analysis of trace metals viz., arsenic, aluminium, cadmium, lead, mercury, iron, copper and zinc in water samples. Muscle and gill tissues of freshwater fish Labeo rohita reared in these water bodies were analysed for bioaccumulation of trace metals. Hebbal fish farm was considered as a reference site (Control site) for water and fish samples. Trace metals were analysed by atomic absorption spectroscopy and values were compared with those recommended by FAO/WHO in water and fish samples. Trace metals such as Al, As and Hg were detected in the water sampled from lake B which is attributed to the differences in the sources of pollutants. Fish tissues viz., muscle and gills sampled from Lake B exhibited high concentration of Al, Pb and Cd content showing a positive correlation with their concentration in water samples. The remaining metals as Cu, Zn and Fe were detected in water sampled from all water bodies and also in the fish tissues. Gills exhibited higher concentration of metals in fish from lake B. Bioaccumulation of these trace metals in fish tissues may cause potential danger to human health when consumed on regular basis. Thus necessary remedial measures are required to combat water contamination and its management keeping in view the aquatic ecosystem and public health. Values were statistically significant at P < 0.0001.
The present study was aimed to evaluate genotoxicity in peripheral erythrocytes of Labeo rohita reared in two lakes viz., Vengaiah lake -sewage polluted (Lake A) and Yellamallappa Chetty lake -industrially polluted (Lake B) of Bangalore. To assess the micronuclei and nuclear abnormalities in such erythrocytes, blood samples were collected from heart of the freshwater fish, L. rohita anesthetized by MS222. The results were compared with the fish reared in the Hebbal fish farm (Control). The data revealed significantly high frequencies of erythrocytic abnormalities including nuclear as well as cytoplasmic in the fish blood sampled from lake B when compared to those of lake A. Such abnormalities in erythrocytes of fish varied seasonally also with summer exhibiting maximum deformities which can be attributed to the presence of genotoxic pollutants in the selected water bodies. The values were statistically significant at P<0.0001.
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