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Cytotoxicity of metals is important because some metals are potential mutagens able to induce tumors in humans and experimental animals, the treatment of (Cr VI) at 43.7 mg L‾1 was for 24 and 96 h, respectively. DNA was extracted after treatment from brain and liver of the tested fish. Our results showed appearance of polymorphic bands at the long treatment interval (96 h) of hexavalent chromium. However, these bands were not appeared when the fish were exposed to the (Cr VI) for the short treatment interval (24 h). Histopathological changes were seen in liver, muscle and gills sections of chromium-exposed fishes. The obtained results were discussed in the study research.]]>Abbas, H.H.H.,1998Oreochromis nitoticus and African catfish, Clarias garipinus.]]>1998Abbas, H.H., K.H. Zaghloul and M.A. Mousa,2002Oreochromis aureus.]]>8013951411Abbas, H.H. and H.M. Mahmoud,2003Oreochromis niloticus) collected from four sites along the River Nile.]]>63307323Abbas, H.H.H. and H.M. 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