* _Y. ruckeri_ causes enteric redmouth disease or yersiniosis; a serious bacterial septicaemia of freshwater and marine fishes. This study was carried out to investigate _Y.__ruckeri_ infection among _O. niloticus_ (Nile tilapia) and _C. gariepinus_ (African catfish) at Sohag Governorate. Ninety-three samples of _O. niloticus_ and eighty-seven samples of _C. gariepinus_ were collected from different localities at Sohag Governorate during ... إقراء المزيد