Abstract
In the previous paper, the organism was designated as a new subspecies of Aeromonas salmonicida according to the morphological and physiological properties.
In this study, the serological relationship between this organism and related oranisms was investigated. As the results, the organism was clearly crossed to A. salmonicida in the heat stable antigenicity, but the both were different from each other in the heat labile and extracellular antigenicities. The present author's proposition of a new subspecies of A.salmonicida for the organism was warranted by the above results.
Therefore, the author designated the organism as Aeromonas salmonicida nov. subsp. masoucida.
