الفهرس 
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Abstract
Abstract
The present study aimed to study the presence of vibrio spp. in some marine water samples and seabream fish with its molecular identification as well as studing some stress factors associated with its pathogenicity. A total of 80 water samples and 180 fish were collected from some fish ponds water and Ismailia area, respectively to study the presence of the vibrio. Experiment was conducted to evaluate the effect of skin abrasions, increasing organic matter as well as decreased dissolved oxygen as stress factors on vibrio pathogenicity. Results revealed that vibrio was significantly higher in pond water in correlation with increasing water temperature from 13 to +30. In collected fish sample vibrio anguillarum was detected (68%) of Samples and molecular characterization indicated that vibrio showed higher prevalence in collected samples as compared to vibrio parahemolyticus (32% ).The results of experimental work indicated that pathogenicity and colonization of the vibrio was higher in case of skin abrasions followed by increasing organic matter in water while decreased dissolved oxygen showed the lowest effect. Experiment results in accordance with microorganism correlation with higher temperature spot the light on expecting vibriosis in summer especially in association with external parasitic infestation.