الفهرس 
Title : Pathological and Immunological Studies on Bacterial Diseases in Oreochromis Fish Species with Emphasis on Vaccination Trials
AbstractOnly 14 pages are availabe for public view
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Abstract
Our study is divided into two main parts; the first part was a survey for one year and determination the prevalence rate of bacterial microorganisms affecting some fish farms in El fayoum and El sharkia governorates. These farms showed signs of septicemia with a history of 20 -25% recorded mortalities during the period from autumn 2018 to summer 2019. In postmortem examination, the affected fish showed loosed scales, ulceration in the dorsal part of the head, petechial hemorrhages on the body surface, unilateral exophthalmia, and corneal opacity together with congested blood vessels of nearly all fleshy portions of the body fins. Internal examination of the viscera showed congestion of the blood vessels in the kidneys and brain together with dark enlarged spleen while the liver was marbled in appearance. Ninety fish samples (representing 10% of the fishes showing clinical signs) were collected from such fish farms for histopathological and bacteriological examination.Aerococcusviridans was isolated from El Fayoum and El Sharkia governorates in rates of7.7%and 15.9% respectively throughout the year while Enterococcus faecalis was isolated with a rate of 34.6 and 39.02 respectively. The prevalence rate of Aeromonashydrophilawas 42.3% in El fayoum governorate and 13.4 % in Elsharkia governorate whileVibrio vulnificuswas recorded 0 % in El fayoum governorate and 7.3 % in El sharkia governorate, Proteus vulgariswas 3.8 in El fayoum governorate and 12.2% in El sharkia governorate.Pseudomonas aeruginosawas 11.5% in Elfayoum governorate and 12.2% in El sharkia governorate