ADVERSE EFFECT OF CHROMIUM IN PISCES–TOXICITY EVALUTE IN L.ROHITA
Tanima Debnath Sarkar*, P. Senthil Elango and M. Muthulingam
ABSTRACT
Chromium toxicity is the affected by valance state chromium (III) is generally less toxic than the chromium (VI). There is equilibrium between the two forms under different conditions. Chromium resistance bacteria capable of reducing or transforming hexavalent to trivalent chromium were isolated from soil and water. Chromium apart from being an important metal present in substantial threat to aquatic life as well as human being. Because soluble chromium is extremely pernicious and shows mutagenic effects, due to its strong oxidizing nature. It destabilizes the ecosystem due to their toxic impact on biota and bioaccumulation in certain organisms. Occurrence of chromium varies in fishes, depending upon their ages, development as well as other physiological variables. It also produced cytotoxicity and detrimental impact on behaviour of fish such hypertrophy and paraplegia at gill epithelium, uneven swimming and suspended feeding. Various research studies indicated adverse effects of chromium in fish at haematological level, like anaemia, thrombocytopenia, decrease in haemoglobin and total erythrocyte count. At biochemical level, mostly decline in the contains of glycogen. Lipids and proteins were observed.
Keywords: Chromium resistance bacteria, biological oxygen demand, chemical oxygen demand, extremely pernicious and mutagenic effects, toxic effect, haematology.
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