EFFECTS OF THERMAL STRATIFICATION ON AQUATIC ENVIRONMENT AT THE VILLAGE PARGAON, DISTRICT PUNE, MAHARASHTRA (INDIA)RAVSAHEB SANGPAL AND UDAY KULKARNIAbstract An attempt has been made to study the effects of geochemical pollution in river water. It is revealed that the unsuitable physico-chemical characteristics triggered by thermal stratification accompanied by of river water led to a creation of a fatal zone for the fish at village Pargaon in the Bhima basin (India). The environmental study of the river water quality suggests that the temporary bunds constructed across the river bed modified the aquatic environment. As a result, during the warm and dry climatic seasons, the temporary stagnant water conditions gave rise to reduction of dissolved oxygen (DO) and also increased toxicity. Simultaneous enhancement in thermal stratification lead to death of fish fauna at restricted locations. Conversely, there was abundance of such fish fauna in the downstream of the river and also in the back waters of the Ujjani dam, where identical physico-chemical and hydro-dynamic conditions existed except the thermal stratification. It is inferred that the addition of fresh water supply (both surface and ground water) from the adjacent region around Pargaon retained the sustainable conditions within water bodies. The lack of fresh water supply, thermal stratification and retention of toxicity are the root causes for the fish deaths. Such toxicity may be reduced by minimizing the thermal stratification and increasing the fresh water supply at the diseased sites.
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