The present study was conducted during the period from January 2010 to December 2010 in south sector of Main out full drain, Nassiriya. Three stations were fixed to achieve the study. The concentration of eight trace metals (cadmium, cobalt, copper, iron, manganese, nickel, lead and zinc) were measured in dissolved and particulate phases of water, exchangeable and residual phases of the sediment and tissues (gills, liver, gut, muscle, ovary and kidney) of two important commercial species of fish Cyprinus carpio L. and Barbus luteus L. In addition, the concentrations of these metals in blood...