Advanced Diagnosis on Vibriosis in Egyptian Mariculture, Fish and Shrimp

Vibriosis, caused by various Vibrio species, poses a major threat to Egyptian mariculture, particularly affecting Sparus aurata, Mugil capito, and Litopenaeus vannamei. This study, conducted in November 2023, aimed to identify and characterize the Vibrio species involved using biochemical and molecular methods. Vibrio spp. were isolated from 45% of the samples examined, with the highest prevalence in S. aurata (58.33%), followed by M. capito (43.33%) and L. vannamei (33.33%). Three species were identified: V. alginolyticus, V. cholerae, and V. mimicus. All S. aurata isolates were V. alginolyticus, while M. capito showed a mixture of all three. In shrimp, V. alginolyticus and V. cholerae were found. Antibiotic susceptibility testing revealed general sensitivity to most drugs tested, although V. alginolyticus showed resistance to penicillin. These findings support the need for targeted diagnostics and biosecurity to manage Vibriosis in aquaculture.