抄録
Populations of rainbow trout (Salmo gairdneri) in freshwater ponds in Japan are often attacked by vibriosis. The causative bacterium was identified as Vibrio piscium var. japonicus by HOSHINA in 1957. But the species is now considered as a synonym of V. anguillarum.
From 1973 to 1976, the present authors studied the biochemical characteristics of 22 strains which were isolated from diseased rainbow trout cultured in ponds in various districts of Japan.
All the strains differ from V. anguillarum in their properties that they show poor growth on standard nutrient agar and fail to decompose arginine, to ferment mannose and mannitol, and to produce indole.
Although further studies are needed to determine the exact taxonomic position of the isolates described here, the authors gave a tentative name of Vibrio sp. RT group to the 22 strains for the convenience of future studies.
