open access

https://hdl.handle.net/2115/38335

Prevalence of Aeromonas salmonicida in the kidney of chum salmon (Oncorhynchus keta) and masu salmon (O. masou) at various life stages

日本語

1991-09

Japanese Society of Fish Pathology

Fish pathology

26(3)

149-153

In the previous paper, we reported that Aeromonas salmonicida was isolated from mature chum salmon (Oncorhynchus keta), pink salmon (O. gorbuscha) and masu salmon (O. masou) without signs or furunculosis. In the present study, we determined the prevalence of A. salmonicida in immature chum salmon without signs or furunculosis captured in rivers and on the coast of Hokkaido. A. salmonicida was not isolated from 480 immature chum salmon were examined from September 1919 to October 1990. We compared the prevalence of A. salmonicida in the kidney of immature and mature chum salmon which ascended the Shibetsu, Nishibetsu and Ishikari rivers. The prevalence of A. salmonicida in the immature fish was lower than that in the mature fish. A. salmonicida was neither detected from the kidneys of chum and masu salmon fry, nor isolated from the surface of chum salmon eggs in the hatcheries. From these results, we considered that these salmonids were not infected with A. salmonicida until they entered the rivers.

学術雑誌論文

Version of Record

0388-788X

AN00063165