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ponds, there was recognized occurrence of the vibriosis caused by serotye A strains again. Among the serotype A strains were isolated from ayu reared in sea water and fresh water ponds, were demonstrated some differences in biochemical characteristics. Pathogenicity of the isolates was confirmed using ayu and amago (Oncorhynchus rhodurus). Serotype A strains from ayu reaed in sea water ponds were observed excellent growth in 2-3% NaCl concentration at 20•Ž, but serotype C strains did not. Serotype A strains from ayu reared in fresh water ponds were shown favourable growth in 1% NaCl concentration at 20 c. As V. anguillarum was never detected from both the new sea water and the newly hatched ayu in our survey, the source of V. anguillarum seemed to be rotifer. Drug bathing of rotifers before administrate it to fish considered to be one of the useful control method of the vibriosis in seedling production of ayu.

Studies on naturally occurring Disease during the Production of Ayu (Plecoglossus altivelis) in Sea Water-II