Abstract
As described in the previous report (MUROGA et al 1973), red spot disease (Pseudomonas anguilliseptica infection of cultured eels) occurred preferably in the Japanese eels (Anguilla japonica) to the European eels (A. anguilla), and ceased when water temperature rises to 26-27°C. In this paper, the present authors confirmed these phenomena by experimental infection.
In the following experiments, fishes were injected intramuscularly with the organisms.
1) Though all of the Japanese eels injected died from the experimental infection, part of the European eels (29%) survived, which suggests that the latter has lower susceptibility to the agent than the former has.
2) From the results of infection experiments, it was made clear that Ps. anguilliseptica has relatively high pathogenicity for Ayu, loach and bluegill sunfish, but low pathogenicity for carp, crucian carp and goldfish, and (also it has) no pathogenicity for mouse.
3) Almost all of the Japanese eels injected died from the experimental infection under 20°C or 25°C but in experiments under 27°C or 29°C few of the eels injected died.
