| multi pesticide and pcb residues in nile tilapia and catfish in assiut city, egypt. | the current study investigated the levels of multi pesticide residues in the highly consumed types of nile fish in egypt: tilapia and cat fish. a total of 50 nile tilapia (oreochromis niloticus) and 50 african catfish (clarias gariepinus) were collected from two areas in assiut city, where most industries are situated and where agricultural activities and raising of farm animals are the main activities. in the first area, elwasta, there is an electrical power station, and the second area, mankba ... | 2014 | 23911921 |