Seasonal Variations of Heavy Metals Concentrations in Different Organs of Carassius auratus (Gibelio, Bloch, 1782) Fish, Caught at Al-Hammar Marsh, Southern Iraq

The bioaccumulation of certain heavy metals: Co, Cu, Fe, Ni, and Pb, was studied by adopting the Atomic Absorption Spectrophotometry, in different organs: muscles, gills, ovary, and kidney of carassius auratus gibelio (Bloch,1982) caught from waters of Al-Hammar marsh , Southern part of Iraq for the period Jan. 2016 to Dec, 2016, one cruse during each month. Fe recorded the high levels in all studied organs and during the whole seasons being the highest at the two occasions of Winter. For Co and Cu were moderately distributed in the organs of carassius auratus gibelio while Ni and Pb were the least. On the other hands, gills and liver were accumulate the highest levels of heavy metals while the muscles and ovary were the least. Heavy metal accumulation in the organs of carassius auratus gibelio fish from Hor Al-Hammar, Southern marshes of Iraq, are in the trend Fe> Co > Cu > Ni > Pb. The result obtained regarding metal concentrations in different organs of fish carassius auratus gibelio revealed that the ecosystems of Hor Al-Hammar marshs are not polluted with toxic elements Ni and Pb.