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This study was performed for the purpose of surveying the distribution and characteristics of the Vibrio species in the diseased farm flounders(Paralichthys olivaceus) during the winter season in Korea. Samples were collected along the southern coast in the Sinam, Keoje Island, and Yeosu areas from November ´90 to Feburary ´91. Nine species of Vibrio were identified as V. tubiashii (85 strains), V damsela (78 strains), V. anguillarum(21 strains), V. compbelli (9 strains), V. jluvialis (9 strains ), V. casticola (1 strain), V. alginolyticus (1 strain), V. gazogenes (1 strain), V marinus (1 strain), and unidentified 3 groups of bacteria (154 strains) which may have related with V. tubiashii were isolated. Eleven kinds of discs (BBL Co.) were used for antibiotic susceptibility test and 116 strains were selected for the experiment. Most bacteria were powerfully inhibited their growth by 4 antibiotics such as cephalothin, chloramphenicol, colistin, and tetracycline, but they were poorly inhibited by 4 antibiotics such as carbenicillin, kanamycin, penicillin G, and streptomycin.
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