Shobha, Manoj, Amar, Smrity, Gargi Sarkar, Vijaylakshmi Pandey, Neeta Lal, Rashmi Sinha, Seema Kumari & Abhijit Dutta*
Department of Zoology, Ranchi University, Ranchi
Received: 19th June2006; Revised: 25th July 2006
Abstract: Heavy metals are metallic elements that have a high atomic number and are poisonous to living organisms. The heavy metals are carried into streams, rivers, lakes, and oceans. The heavy metals may be deposited in sediments at the bottom of the water body, or they may evaporate and be carried elsewhere as rainwater. The biological cycle includes accumulation in plants and animals and entry into the food web. Investigation was carried out to evaluate the toxic effect of two common heavy metals- Mercury and Nickel in the fresh water fish, Channa punctatus and to follow the recovery of these two trace metal elimination from intoxicated fish once they were transferred to a clean ambience. Specifically, the toxicity assay was done by observing the behavioral and histopathological changes in certain tissues of the exposed fishes and were compared with that of a control fish, followed by alteration in the brain and muscular activity of Acetylcholinesterase of control and treated fishes.