Abstract
Columnaris disease, caused by Flavobacterium columnare, is an emerging problem in the rainbow trout (Oncorhynchus mykiss) aquaculture industry of Idaho. All F. columnare isolates taken from disease outbreaks in the rainbow trout producing region of southern Idaho, and for rainbow trout, are all genomovar I. Virulence phenotyping of 11 genomovar I and 1 genomovar I/II isolates, taken from 6 different farms, suggests significant variation in virulence toward rainbow trout with the most virulent strains having an LD50 of 1×106CFU/ml−1 when using a waterborne challenge model. The least virulent strain required 8×106CFU/ml−1 to reach the LD50. AFLP fingerprinting of these strains and the resulting phylogenetic tree show that all of the strains tested had a percent similarity of 75% or higher, save one, the MS-FC-4 strain had <60% identity to all of the other strains tested. These results suggest strains of F. columnare isolated from disease outbreaks in rainbow trout production have a higher degree of diversity than previously thought.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
