Fish Pathology
Online ISSN : 1881-7335
Print ISSN : 0388-788X
ISSN-L : 0388-788X
Short Communications
Pathogenicity of Streptococcus parauberis to Olive Flounder Paralichthys olivaceus
Ji Hyung KimDennis K. GomezGun Wook BaeckGee Wook ShinGang Joon HeoTae Sung JungSe Chang Park
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2006 Volume 41 Issue 4 Pages 171-173


Streptococcus parauberis (stain SNUFPC-050803), isolated from diseased olive flounder Paralichthys olivaceus in Jeju Island, Korea, was evaluated for its pathogenicity to healthy juvenile flounder (29.3 g in average body weight). When challenged with the isolate by intraperitoneal injection with tenfold serial dilutions of 4.5 × 10-106 CFU/fish, the cumulative mortality ranged from 10% to 80% within 14 days except for 4.5 × 10 CFU/fish and control with no mortality. Disease signs were hemorrhage around the mouth, eyes and pectoral fins, pale and friable liver with hepatomegaly and ascitic fluid in the peritoneal cavity. These signs were similar to those of naturally affected fish. S. parauberis was reisolated and identified by PCR method, which confirmed the pathogenicity of the bacterium to olive flounder.

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© 2006 The Japanese Society of Fish Pathology
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