Detection of some virulence genes in A. hydrophila and A. caviae isolated from fresh water fishes at Qalubia Governorate

Abstract

The study was conducted on 225 diseased fish samples, 125 Nile tilapia (Oreochromis niloticus) and 100 Catfish(Claris gariepinus) , collected from different fish markets at Qalubia Governorate during the period from January (2016) to May (2017) for detection of Aeromonas species. The samples were taken from apparently pathognomonic lesions in muscle, kidney, liver, intestine and spleen after clinical and postmortem examination for bacteriological examination. The results revealed that, 125 Aeromonas species were isolated from the examined samples where A. hydrophila and A. caviae were identified. Accurately 114 (91.2 %) A. hydrophila strains, 63 (50.4%) and 51 (40.8%) were isolated from C. gariepinus and O. niloticus fishes respectively. Meanwhile, 11(8.8 %) A. caviae strains, 7 (5.6%) and 4 (3.2%) from C.