IJEP 42(5): 534-542 : Vol. 42 Issue. 5 (May 2022)
1. Ayya Nadar Janaki Ammal College (Autonomous), Post-Graduate and Research Department of Zoology, Sivakasi – 626 123, Tamil Nadu, India
2. Ayya Nadar Janaki Ammal College (Autonomous), Department of Micrology, Sivakasi – 626 123, Tamil Nadu, India
Abstract
Heavy metals are metallic elements with high atomic weight and a much greater density (atleast five times) than water. The attractive name for the group of elements is ‘trace metals’. There are more than 20 heavy metals. The heavy metals, such as cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), nickel (Ni), lead (Pb) and zinc (Zn), among which lead (Pb), cadmium (Cd), mercury (Hg) and inorganic arsenic (As) show harmful effects to human health. The fish is a bio-marker of aquatic medium. Fishes have been perceived as a good gatherer of natural and inorganic pollutants. Against this backdrop, the present study has been assessed. Heavy metals (Pb, Zn, Cu, Cd) in selected water bodies of Rajapalayam taluk and accumulation of heavy metals (Pb, Zn, Cu and Cd) in the selected freshwater fishes (Oreochromis mossambicus, Catla catla, Mystus aor, Channa striata) and their haematological changes (total RBC count, WBC count, haemoglobin content) and physiological changes (opercular movement and oxygen consumption) were studied.
Keywords
Fishes, heavy metals, haematological changes, pollutants, physiological changes, water
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