Abstract
In the previous report (MUROGA et al., 1979), a vibrio isolated from diseased ayu (Plecoglossus altivelis) was classified as non-cholera vibrio (non-agglutinable vibrio) on the basis of its morphological, biochemical and genetical characteristics.
In this paper, physiological characteristics and pathogenicity of the organism are described.
The experimental results are summerized as follows.
1) Effect of NaCl, temperature and pH on the growth of the organism : It grew in broth (1%peptone)at NaCl 0-5%(optimum 1%), at temperatures 15-42°C(optimum 37°C), and at pH 7-10(optimum 8), respectively.
2) Survival in waters:At 25°C the organism perished in distilled water within a few hours, but it survived 320 days in freshwater, 0.85%NaCl solution, Ringer solution, Ringer-Locke solution, sea water, and diluted sea water. At 2°C, however, it became extinct in 8 days in freshwater.
3) Pathogenicity:Ayu infected by immersion method died at 21°Cand 26°C, but not at 16°C.The organism killed eels(Anguilla japonica)and mice.
