Passive immunization of rainbow trout, Oncorhynchus mykiss (Walbaum), against Flavobacterium psychrophilum, the causative agent of bacterial coldwater disease and rainbow trout fry syndrome

2003 ◽  
Vol 26 (7) ◽  
pp. 377-384 ◽  
Author(s):  
B R LaFrentz ◽  
S E LaPatra ◽  
G R Jones ◽  
K D Cain
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Causative Agent ◽  
Passive Immunization ◽  
Flavobacterium Psychrophilum ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Coldwater Disease ◽  
Rainbow Trout Fry Syndrome ◽  
Bacterial Coldwater Disease

scholarly journals Large-Scale Analysis ofFlavobacterium psychrophilumMultilocus Sequence Typing Genotypes Recovered from North American Salmonids Indicates that both Newly Identified and Recurrent Clonal Complexes Are Associated with Disease

2019 ◽  
Vol 85 (6) ◽  
Author(s):  
Christopher Knupp ◽  
Gregory D. Wiens ◽  
Mohamed Faisal ◽  
Douglas R. Call ◽  
Kenneth D. Cain ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Rainbow Trout ◽  
North America ◽  
North American ◽  
Economic Losses ◽  
Content Type ◽  
Flavobacterium Psychrophilum ◽  
Coldwater Disease ◽  
Rainbow Trout Fry Syndrome ◽  
Bacterial Coldwater Disease

ABSTRACTFlavobacterium psychrophilum, the etiological agent of bacterial coldwater disease (BCWD) and rainbow trout fry syndrome (RTFS), causes significant economic losses in salmonid aquaculture, particularly in rainbow trout (Oncorhynchus mykiss). Prior studies have used multilocus sequence typing (MLST) to examine genetic heterogeneity withinF. psychrophilum. At present, however, its population structure in North America is incompletely understood, as only 107 isolates have been genotyped. Herein, MLST was used to investigate the genetic diversity of an additional 314 North AmericanF. psychrophilumisolates that were recovered from ten fish host species from 20 U.S. states and 1 Canadian province over nearly four decades. These isolates were placed into 66 sequence types (STs), 47 of which were novel, increasing the number of clonal complexes (CCs) in North America from 7 to 12. Newly identified CCs were diverse in terms of host association, distribution, and association with disease. The largestF. psychrophilumCC identified was CC-ST10, within which 10 novel genotypes were discovered, most of which came fromO. mykissexperiencing BCWD. This discovery, among others, provides evidence for the hypothesis that ST10 (i.e., the founding ST of CC-ST10) originated in North America. Furthermore, ST275 (in CC-ST10) was recovered from wild/feral adult steelhead and marks the first recovery of CC-ST10 from wild/feral fish in North America. Analyses also revealed that at the allele level, the diversification ofF. psychrophilumin North America is driven three times more frequently by recombination than random nucleic acid mutation, possibly indicating how new phenotypes emerge within this species.IMPORTANCEFlavobacterium psychrophilumis the causative agent of bacterial coldwater disease (BCWD) and rainbow trout fry syndrome (RTFS), both of which cause substantial losses in farmed fish populations worldwide. To better prevent and control BCWD and RTFS outbreaks, we sought to characterize the genetic diversity of several hundredF. psychrophilumisolates that were recovered from diseased fish across North America. Results highlighted multipleF. psychrophilumgenetic strains that appear to play an important role in disease events in North American aquaculture facilities and suggest that the practice of trading fish eggs has led to the continental and transcontinental spread of this bacterium. The knowledge generated herein will be invaluable toward guiding the development of future disease prevention techniques.

Intramuscular challenge of rainbow trout (Oncorhynchus mykiss) with two Norwegian field strains of Flavobacterium psychrophilum

2013 ◽  
Vol 35 (2) ◽  
pp. 595-598 ◽  
Author(s):  
Børge N. Fredriksen ◽  
Anette Furevik ◽  
David Gauthier ◽  
Marie Egenberg ◽  
Erik D. Paulsen ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Flavobacterium Psychrophilum ◽  
Rainbow Trout Oncorhynchus Mykiss
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