Fifty samples representing eight species of freshwater Fish (Oreochromis niloticus, Clarias lazera, Labeo niloticus, Bagrus bajad, Synodontis schall, Morymyrus niloticus, Lates niloticus and Malapterurus electricus) were collected randomly from different sources at Assiut during March to August 2001.The samples were analyzed for residues of persistent organochlorines (p,p'-DDT, o,p'-DDT, p,p'-DDE ...