Antimicrobial resistance and its genetic determinants in aeromonads isolated in ornamental (koi) carp () and common carp ()

17 The aim of this study was to evaluate antimicrobial susceptibility of Aeromonas spp. isolates 18 from common carp and koi carp coming from randomly chosen farms. The isolates were tested 19 for susceptibility to 8 antimicrobial agents using the standard agar dilution susceptibility test. In 20 all isolates, PCR was used to detect the presence of tet(A-E) genes, integrase genes, and gene 21 cassettes. From the total 72 isolates of motile aeromonads sampled from koi carp, 36 isolates 22 (50%) were resistant to oxytetracycline, 18 (25%) to ciprofloxacin, 5 (7%) to chloramphenicol, 23 5 (7%) to florfenicol, and 11 (15%) to trimethoprim. Among 49 isolates of motile aeromonads 24 collected from common carp, 20 (41%) were resistant to oxytetracycline, 3 (6%) to 25 Manuscript

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