Abstract
Biological and biochemical characteristics were studied about the bacteria isolated from lesions of gills, wall of the mouth cavity or body surface of eels (Anguilla japonica), carp (Cyprinus carpio) and rainbow trout (Salmo gardneri) by using Cytophaga agar media by Ordal and Rucker in the summer from 1967 to 1968.
The cultures were long flexible Gram negative rods and about 0.5 by 3.7 to 14.8μ. The formation of fruiting bodies and the production of microcysts were observed in 7-day olds cultures on the roach media. The production of microcysts were clearly observed in 2-weeks old cultures in the Cytophaga liquid media. The biological characteristics of 21 strains tested were all the same. Optimum temperature for the growth of the organism in the liquid media was 26.8°C.
From the results mentioned above, the organism was identified as Chondrococcus columnaris (DAVIS) ORDAL and RUCKER (1944).
