Nowadays, small fish are used as a source of protein in feed of poultry. Fish fed meals could concentrate Hg to undesirable levels if fish were collected from contaminated areas. Even low level of Hg in poultry feed made of fish can cause Hg accumulation in their flesh exceeding up to 0.03 mg/kg (Lindberg et al., 2004). Research has demonstrated that absorption of nutrients from poultry feeds via the digestive tract of chicken is relatively low, and a large portion of trace and toxic elements including Hg may pass into their manures (Kpomblekou et al., 2002). Experimental studies with chickens fed fish meal revealed relatively high Hg concentrations in their different tissues. However, some tissues accumulated more Hg than others (Lewis et al., 1993).