BIOACCUMULATION OF HEAVY METALS IN NAGAVARA LAKE, BENGALURU
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Date
2023
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KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR
Abstract
The contamination of heavy metals in the aquatic environments is hazardous due to their toxicity, low solubility, persistence and biological accumulation. Lakes are important ecosystems of great value to humans and are prone to pollution from native and non-native sources also the various anthropogenic sources that interrupt the functioning of aquatic ecosystem. Fishes have been extensively examined as bioindicators of metal accumulation. Fish is an important source of food for humans, because of the pharmaceutical benefits of omega 3 polyunsaturated fatty acids, which is available in fish oil. But wide ranges of contaminants, including heavy metals are continuously introduced into the aquatic environments and fish from polluted waters seriously threaten human health due to the bioaccumulation of heavy metals in muscle and other tissues. On the whole pollution state of freshwater ecosystem, an experiment has been carried out to know the accumulation of four heavy metals concentration in water, sediment and different organs of Oreochromis mossambicus collected from Nagavara lake. Among the four metals lead (Pb) and cadmium (Cd) were not detected in any of the tissue samples of the fish. The abundance of heavy metal concentrations in the waters of study area was Zn>Cu> Pb>Cd. Whereas the abundance of heavy metal concentrations in the sediment of study area was in the sequence of Cu>Zn>Pb>Cd. The order of heavy metal accumulation in different organs of O. mossambicus was Zn>Cu>Pb-Cd in gill tissue, Zn>Cu>Pb-Cd in the muscle tissue, Zn>Cu>Pb-Cd in kidney and Zn>Cu>Pb-Cd in the liver.
Key words: Nagavara lake, Bioaccumulation, Heavy metals