Heavy metals are found naturally in micro quantities in all aquatic systems. In fact, some of them are essential micronutrients for living organisms. However, they became highly toxic to the organisms when present in higher concentrations. These metal concentrations have been altered in the ecosystem by indiscriminate anthropogenic activities and dispersed into the water as well as sediment column . The metal contaminants in aquatic systems usually remain either in soluble or suspension form and are taken up by the organisms living in them.