Characterization of Edwardsiella tarda Isolated from Farm-Cultured Eels Anguilla japonica in Korea

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We surveyed the occurrence of edwardsiellosis on eel farms and investigated the characteristics of Edwardsiella tarda isolated from farm-cultured eels in Korea. The occurrence rate of the edwardsiellosis was 72% on the investigated samples. Among the edwardsiellosis cases, 46% were found to be mixed infections, with parasites and other kinds of bacteria. Some of biochemical characteristics of the E. tarda isolates were different from those of previously reported E. tarda isolated from several kinds of fish from different countries, especially in terms of hydrogen sulfide and indole production. The E. tarda isolated from eels in Korea had two biogroup, wild-type biogroup and biogroup 1 characteristics. The enzymatic activity of the E. tarda showed similar patterns to previously reported E. tarda strains and ATCC strains. This is the first report that E. tarda isolated from farm-cultured eels had some different biochemical characteristics from those of previously reported E. tarda which isolated from several kind of fish.