Observation of inherently contaminated oncorhynchus mykiss Walbaum, 1792 by Aeromonas veronii with MALDI-TOF and culture methods and specification of antibiotic sensitivity profiles of agent in a commercial farms

Background: The Rainbow trout, Oncorhynchus mykiss (Walbaum, 1792) is commercially farmed in the Southeastern Anatolia Region, Turkey. Aeromonas spp. is a widely found bacterium of aquatic ecosystems such as freshwater and coastal water. They are increasingly noticed as critical pathogens. The Rainbow trout causes acute death, that is characterized by internal organ hemorrhages, such as the spleen, kidney and liver body surface, ulcerations and congestion. Methods: This study, investigated a total of 1,200 fish samples from commercial farms in the Southeastern Anatolia region. Aeromonas veronii was isolated from the kidney, liver and tissue of fish on the Blood Agar and McConkey Agar for bacteriological examinations. Isolated strains were identified by MALDİ-TOF. Result: A. veronii infection was observed from 0% to 100% in fish farms that cover different regions of the Southeastern Anatolia region. The sensitivity of oxytetracycline, enrofloxacin, florfenicol, neomycin, erythromycin and amoxicillin were defined at chancing ratios.