Japanese Journal of Veterinary Research;Volume 35, Number 4

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BACTERIAL INFECTION WHICH PRODUCES HIGH MORTALITY IN CULTURED JAPANESE FLOUNDER (PARALICHTHYS OLIVACEUS) IN HOKKAIDO

KODAMA, Hiroshi;MURAI, Takashi;NAKANISHI, Yuki;YAMAMOTO, Fukie;MIKAMI, Takeshi;IZAWA, Hisao

Permalink : http://hdl.handle.net/2115/3079
JaLCDOI : 10.14943/jjvr.35.4.227
KEYWORDS : Edwardsiella tarda;edwardsiellosis;Japanese flounder

Abstract

An infectious disease occurred in two groups of young Japanese flounder (Paralichthys olivaceus) reared in a commercial fish farm in Hokkaido in August 1985. These fish had been introduced in January 1985 from individual fish farms located in the southwestern part of Japan. More than 80% of the fish died within two weeks. Ulcerative lesions and loss of the skin were prominently observed, and the muscle was exposed. Hemorrhage and loss of fins, protrusion of the rectum, and swelling of the spleen were also observed. Edwardsiella tarda was isolated in pure culture from various tissues and organs. Japanese flounder inoculated with the isolate experimentally by infiltration or by an in traperitoneal route died one week after the inoculation. Swelling of abdomen and accumulation of ascitic fluid containing blood were significant.

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