In this study, the concentration level of some heavy elements, including copper, cadmium and zinc, was determined in the gills, digestive tract and muscles of Mugil fish. Mugil fish were chosen for their availability and abundance at the study stations (Nasiriyah City and Al-Jabaish). The concentrations of heavy metals in fish and their nutritional content were measured. Differences in the concentration of heavy metals were observed between the studied parts. The highest concentrations were recorded in the digestive tract, while the lowest concentration of heavy metals was recorded in the muscles. Compared to the limits set by the World Health Organization, some values exceeded the permissible limits. Fish are important and the presence of metals in their bodies leads to metals' transmission through the food chain to humans, causing numerous diseases and serious problems resulting from the increase of heavy metals in fish and the environment. Thus, the aim of the study was to investigate the effect of heavy metal accumulation in frozen and fresh fish on human consumers.