Fish Pathology
Online ISSN : 1881-7335
Print ISSN : 0388-788X
ISSN-L : 0388-788X
Redmouth Disease
Takamitsu Sakai
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2021 Volume 56 Issue 1 Pages 1-5


Redmouth disease is caused by the infection of the enteric bacterium Yersinia ruckeri. ​The disease was first noticed in rainbow trout Oncorhynchus mykiss in the USA in 1950s and has since been observed in salmonids and some other fishes in many countries. ​Y. ruckeri can be classified into different biotypes, serotypes, or genotypes, according to biological properties such as motility or enzyme activity, antigenicity, or gene sequences. ​In particular, O-antigen, which is one of the markers for serotyping, is an important antigen for the vaccination for of Y. ruckeri. ​In Japan, redmouth disease is listed as one of the notifiable diseases of aquatic animals by the government to prevent occurrences or spreading of the disease. ​This review describes topics necessary important for the diagnosis and control of the disease.

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© 2021 The Japanese Society of Fish Pathology
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