Abstract
Industrial effluents containing heavy metals may reach aquatic systems either through direct discharge or surface runoff and cause damage to aquatic organisms affecting their immune system and health. Hence the present study has been undertaken to observe the effects of hexavalent chromium on the WBCs of the fresh water fish, Labeorohita. WBCs play a major role in the immune response of the fish. For acute toxicity determination, healthy fish were subjected to static bioassays. The 24, 48, 72, and 96hr LC50 values were 50.88, 42.03, 28.09 and 10.87 ppm respectively. The fish were exposed to 0.5, 1, 1.5 and 2 ppm for 20 days. Differential count of WBCs and total WBC count were determined after every five days for twenty days. Lymphocytes exhibited a decline while the other cells and total WBC count exhibited an increase due to hexavalent chromium exposure. The results were subjected to two way analysis of variance.
Highlights
Fishes are the most important biomonitoring agents for the evaluation of toxic components accumulated in polluted aquatic ecosystems
The percent mortality of L. rohita exposed to different concentrations of chromium was noted
The LC50 values observed decreased with increase in the duration of exposure
Summary
Fishes are the most important biomonitoring agents for the evaluation of toxic components accumulated in polluted aquatic ecosystems. They help to understand the nature as well as the changes of aquatic ecosystems in an effective manner. They are highly sensitive to environmental changes in particular to aquatic pollution when compared to other aquatic organisms. The impact of heavy metals is reflected heavily on the physiology and immunology of fish. Comprehensive knowledge towards the physiology and immunology of fish are very much handy with reference to the impacts of heavy metals and aquatic pollution
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