Antimicrobial resistance of Vibrio (Listonella) anguillarum isolatedfrom rainbow trouts (Oncorhynchus mykiss)

Vibrio (also known as Listonella) species are widely distributed in aquatic environments and are often mentioned as the aquatic equivalent of aeromonads. The aim of this study is to investigate the exposure of rainbow trouts with V. anguillarum, and determination of antimicrobial resistance of the isolated strains. A total of 100 rainbow trout (Oncorhynchus mykiss) samples were collected from various commercial fish hatcheries in the Aegean Region of Turkey in June 2013. Twelve V. anguillarum were isolated from 100 rainbow trout (Oncorhynchus mykiss) samples. V. anguillarum isolates were resistant to cloxacillin, ampicillin, sulfamethoxazol-trimethoprime and erythromycin in the ratio of 100 %. High levels of resistance are considered to be the result of random antibiotic therapies in aquaculture, hence the results of this study indicated that identification of etiological agent and the exact chemotherapy must be applied in order to prevent residual water contamination and resistant strains of V. anguillarum.