The server is under maintenance between 08:00 to 12:00 (GMT+08:00), and please visit later.
We apologize for any inconvenience caused
Login  | Sign Up  |  Oriprobe Inc. Feed
China/Asia On Demand
Journal Articles
Laws/Policies/Regulations
Companies/Products
Bookmark and Share
ISOLATION,IDENTIFICATION AND PATHOGENICITY OF A PATHOGENIC BACTERIUM YERSINIA RUCKERI ASSOCIATED WITH HEMORRHAGE OF CULTURED AMUR STURGEON(ACIPENSER SCHRENCKII)
Author(s): 
Pages: 561-567
Year: Issue:  3
Journal: Oceanologia et Limnologia Sinica

Keyword:  AcipenserschrenckiiYersiniaruckeri16S rRNA genepathogenicity;
Abstract: Yersinia ruckeri is a causative agent of enteric red-mouth disease or yersiniosis; it infects salmonids and several other fish species with hemorrhagic signs on body surface and in intestine.In this study,a bacterial strain YR-H01 was isolated from Amur sturgeon(Acipenserschrenckii) with hemorrhage disease and was identified as Yersinia ruckeri by analyzing biochemical reactions and 16S rRNA gene sequence.The intraperitoneally YR-H01-injected fish showed obvious haemorrhaging in anus,fin base,lower jaw,and internal organs.The bacterial strains isolated from artificially-infected fish showed similar morphological and biochemical characteristics to those from naturally infected fish.Therefore,Y.ruckeri was pathogenic to Amur sturgeon with similar clinical signs as naturally diseased fish in LD 507.2×106 CFU according to the Reed-Muench method.The stronger the challenge dosage of YR-H01 strain applied,the quicker the clinical signs appeared.Pathologic observation showed that the liver cells of fish were damaged after challenged by Yersinia ruckeri,showing obvious lesions,including lymphocytes infiltration,hepatic cord disappearance,cells plumping,vacuolar degeneration,and nucleolus marginalization.
Related Articles
No related articles found