Monthly sampleof three months periodto determine levels of petroleum bearing heavy metals contamination of Fe, Pb, Ni, Cd, Hg, and Cu in tissues of Crassostreagasar (oyster) were obtained from B/DereCreek system of the Niger Delta. The brackish water creek was polluted with spilled crude oil,from an oil facility in the area,impacting resident aquatic resourcebiota including, the sessilemollusk, Crassostreagasar. Analyzed tissuesamples showedpresence of the heavy metals.M, Bioaccumulationlevel of metals per gram of the animaltissue were of the range;Lead(0.11mg/g-0.14mg/g), Nickel (0.001mg/l-0.13mg/g), Cadmium (0.001mg/g-0.05mg/g), Mercury (>0.001mg/g), iron (182.44mg/g-320.09mg/g)and Copper (0.001mg/g-0.05mg/g). Mercury, Lead and Cadmium (Hg, Pb, Cd) were within permissible limitof WHO,while others were abovethe permissible limit.It wastherefore recommended that consumptionof the animalsfrom this water body bechecked to minimize food poisoningor complications resulting from their contamination.
