The toxic effects of heavy metals particularly mercury, cadmium and lead have been broadly documented as well as levels of heavy metals in fish. Mercury vapor is easily transported in the atmosphere,deposited on land and water, and then, in part released again to the atmosphere. Trace amounts of mercury are soluble in bodies of water, where bacteria can cause chemical changes that transform mercury to methylmercury, a more toxic form. Fish absorb methylmercury from water as it passes over their gills and as they feed on aquatic organisms. Larger predator fish are exposed to higher levels of methylmercury from their prey. Methylmercury binds tightly to the proteins in fish tissue, including muscle and cooking does not appreciably reduce the methyl mercury content of the fish. Over the last few decades, there has been growing interest in determining heavy metal levels in the marine environment and this has also drawn attention to the measurement of contamination levels in public food supplies articularly fish (Kalay, Aly, & Canil, 1999). Several agencies and organizations such as the US Food and Drug Administration (US FDA), Food and Agriculture Organization (FAO), and the World Health Organization (WHO) provide guidelines on the intake of trace elements by humans. The joint FAO/WHO Expert Committee recommended Provisional Tolerable Weekly Intakes (PTWIs) and acceptable daily intakes as guidelines for food additives and certain contaminants in foods