El-Gamal Refaat

• Professor
• Professor at Agricultural Research Center

Flavobacterium columnare is an important pathogen affecting gills and skin of freshwater fishes causing columnaris disease. Two hundred diseased fish were randomly collected from different localities throughout year (2018-2019). Flavobacterium columnare (F. columnare) showed seasonal prevalence 0.00%, 10%, 40.00%, and 20.00% in winter, spring, summ...

This study was designed to detect some antibiotic resistance genes of S.aureus by using PCR. A total of 150 Cat fish (Clarias garipeneaus) with a body weight ranged from200-250g. suffered from ulcerated skin and erosion. S. aureus were isolated in percent of 100% from infected fish by using Baird parker as selective media. By using multiplex PCR fo...

The present study was planned to investigate the phenotypic and genotypic characterization of bacteria isolated from shrimps in Suez Canal area. A total number of 210 shell diseased shrimps (Penaeus japonicas) were collected. Isolation of 732 isolates from shrimp muscles, cuticles, gills, haemolymph and hepatopancrease and were identified according...

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 staphyloco...

White spot syndrome virus (WSSV) in Egyptian shrimp is poorly understood and there is no available information regarding possible WSSV infection of native shrimp in Egypt. Therefore, the main goal of this work was to diagnose WSSV in Egyptian shrimp by histopathological examination and molecular based methods (PCR). A total of 90 shrimp samples sho...

p>White spot syndrome virus (WSSV) in Egyptian shrimp is poorly understood and there is no available information regarding possible WSSV infection of native shrimp in Egypt. Therefore, the main goal of this work was to diagnosis of WSSV in Egyptian shrimp by histopathological examination and molecular based methods (PCR). A total of 90 shrimp sampl...

This experiment was conducted to evaluate the use of ethanol-extracted from the medicinal plant, Origanium vulgare as a growth and immunity promoter for Nile tilapia, Oreochromis niloticus (L.) fingerlings. Fish (average 12.27 g) were randomly distributed into four treatments; three replicates each at a rate of 20 fish per 100 L aquarium. Fish were...