الفهرس 
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Abstract
• Vibrios are a group of Gram negative septicemic bacteria that mainly affect marine, estuarine fishes and sometimes freshwater fishes. Four main species of Vibrios were commonly isolated /identified from the thinlip grey mullet (Liza ramada)collected through spring 2017 to autumn 2017. The identities of the retrieved isolates were confirmed as Vibrio alginolyticus (V. alginolyticus),Vibrio fluvialis (V. fluvialis,) Vibrio Parahaemolyticus (V. Parahaemolyticus) and Vibrio vulnificus (V. vulnificus) depending on their morphological /biochemical characteristics obtained from the adopted conventional and semi-automated biochemical tests (API20E). The aim of this study is to Determination of the prevalence of Vibrios infection among Mugil fish collected from aquaculture facilities at Northern Egyptian provinces. Detection, isolation and identification of the most common Vibrios among Collected Mugil fish samples. Results & methods : Results has also revealed that V. alginolyticuswas the highest isolated species (27.50 %) in Summer 2017 and autumn 2017(22.50%) ,while V. vulnificus was the lowest isolated through spring 2017 (3.75%) and autumn 2017(3.75%) . In spring season 2017, V. parahaemolyticus presented the highest percentage of infection (12.5 %). Antibiogram has revealed that most of the retrieved V. alginolyticus were sensitive to Doxycyclin and Polymyxin and resistant to Oxytetracyclin, Florfenicol and Ampicillin. However V. fluvialis isolate were sensitive to all tested antibiotics with the exception of Ampicillin. Recommendations: The Egyptian Fish wealth / Veterinary health authorities should consider the resultsof the current study as a scientific report that alarmsabout the danger of the growing agricultural / municipal drainage pollution at the Northern provinces of Nile Delta including Lakes and open water streams. Official health leaflets should be distributed to the public to warn them from the danger of using raw or undercooked fishes collected from these water sources.