“…Heavy metals (e.g., Fe, Ni, Cd, Cu, Cr, Ba, etc) and many organics like hydrocarbons and pesticides have been reported in various concentrations in many rivers and creeks in the Niger Delta region of Nigeria (Anyakora et al, 2005;Olowoyo et al, 2010;Godwin et al, 2011;Nwabueze, 2011) and these pollutants have a tendency to accumulate in biota (Landrum et al, 2003;Anyakora & Coker, 2007) and undergo food chain magnification (James et al,1998). It is therefore imperative to monitor the concentration of these pollutants in the environment and to analyze bioaccumulation process in order to assess the possible impact on human health and risk which man faces in such an environment (Kotze et al, 1999).…”