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Prevalence of Aeromonas salmonicida, the causative agent of Furunculosis, among salmonid fish in Japan from 1979-2002

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Title: Prevalence of Aeromonas salmonicida, the causative agent of Furunculosis, among salmonid fish in Japan from 1979-2002
Authors: Nomura, Tetsuichi Browse this author
Kasai, Hisae Browse this author →KAKEN DB
Yoshimizu, Mamoru Browse this author →KAKEN DB
Issue Date: Nov-2003
Publisher: International Society for Veterinary Epidemiology and Economics
Journal Title: Proceedings of the 10th International Symposium for Veterinary Epidemiology and Economics
Start Page: 6
End Page: 9
Abstract: This study was carried out for the purpose of establishing control methods for furunculosis affecting propagated salmon in Japan. We determined the distribution and prevalence of A. salmonicida among asymptomatic adult chum (Oncorhynchus keta), pink (O. gorbuscha) and masu salmon (O. masou) returning to rivers on the island of Hokkaido and on the mainland of Honshu. During 1979-2002, a total of 22,109 chum, pink and masu salmon were collected from the rivers in Hokkaido and Honshu. We isolated A. salmonicida from the chum salmon in 21 of the 34 rivers examined and the overall prevalence was 12.2 % in the infected stocks. The prevalence of the agent in pink salmon and masu salmon was 4.6 % and 1.4 % respectively. Using CBB medium, we also examined the chum salmon from the Chitose River catching site. The prevalence of the agent on gill surface was high (50%) at the catching site and decreased among fish in the holding pond in the river. The bacteria appear to be spread during fish migration in the river and during transportation of the fish from the capture site to the holding pond. Recently, the agent was isolated from the gill surface of chum salmon caught off the coast of the eastern part of Hokkaido, but the prevalence was low (1.7%). To control furunculosis in salmonids, the fish should be held for maturation in ponds under conditions of low density and the fish should be disinfected to prevent spread of furunculosis before placement in the holding pond.
Description: 10th International Symposium for Veterinary Epidemiology and Economics. 17-21 November 2003. Vina Del Mar, Chile.
Conference Name: International Symposium for Veterinary Epidemiology and Economics
Conference Sequence: 10
Conference Place: Vina Del Mar
Type: proceedings (author version)
URI: http://hdl.handle.net/2115/38989
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 吉水 守

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