Khafagy A.R.1; El-Gamal R.M.2;
Hala F. Ayoub2;

Samaa A.M1 and Aly S.M.3

1Depts of Bacteriology and 3Pathology, Faculty of Vet. Medicine, Suez Canal University, Ismailia, Egypt.

2Central Laboratory for Aquaculture Research, Agriculture Research Center, Egypt.


Bacteriological examination was performed on 150 catfish (Clarias garipeneaus) with a body weight ranged from 200 – 250g suffered from ulcerated and eroded skin. Fish were collected from Bahr ELbaker in Sharkia Government and fish market in Abu-Hammad, Sharkia, in summer season of 2016 for staphylococcus aureus isolation. The prevalence of staphylococcus aureus isolaties was 100% for all examined fish. The prevalence of S. aureus lesions, gills, skin, liver, kidney and intestine infection were 100, 100, 40, 30 and 17% respectively. Histopathology of experimentally infected fish was done. The results showed that, the histopathological changes induced in the gills were represented by mononuclear cell infiltration in gill lamellae and gill arch with focal epithelial desquamation. The skin exhibited vacuolar and ballooning degeneration in the epidermis. The musculature displayed edema, hemorrhage, hyaline degeneration and Zenker’s necrosis. The liver showed congestion in the central vein and portal vessels. It could be concluded that, fish can be contaminated by organisms that may be found in either water, or post harvest or either during marketing. This microbial contamination may affect the fish quality. So the basic principles for prevention of food borne disease and production of fish of high quality should be implemented.