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Selective breeding provides an approach to increase resistanceof rainbow trout (Onchorhynchus mykiss) to the diseases, enteric redmouth disease, rainbow trout fry syndrome, and viral haemorrhagic septicaemia

In this project, we reasoned that if we challenged rainbow trout   with the causative agents of enteric redmouth disease (ERM), rainbow   trout fry syndrome (RTFS), and viral haemorrhagic septicaemia (VHS),   we would: 1) detect additive genetic variation for resistance to   ERM, RTFS, and VHS; and 2) find that resistance of the trout to ERM   and RTFS are favourably correlated genetically, while resistance to   VHS is unfavourably correlated with resistance to ERM and RTFS. We   tested these premises by challenging 63 full-sib families of rainbow   trout (5  sires, 38 dams) with Yersinia ruckeri, Flavobacterium  psychrophilum, and VHS virus, the causative agents of ERM, RTFS, and   VHS. Resistance to each disease was assessed as both a binary trait   (i.e., died/survived) and a longitudinal trait (i.e., time until   death following challenge). Our findings support the first of   our premises as we detected additive genetic variation for   resistance to ERM, RTFS, and VHS. The heritability for resistance to   ERM, RTFS, and VHS ranged between  .42 and  .57 on the underlying   liability scale when resistance was assessed as a binary trait. As a  longitudinal trait, the heritabilities ranged between  . 7 and  .21   for time until death on the logarithmic-time scale. We were,   however, unable to support our second premise as we found that   resistance to each of the diseases tended to be weakly correlated   genetically. The genetic correlations between the resistances ranged   between (-) .11 and  .15 when resistance was assessed as a binary   trait, and between (-) .23 and  .16 when resistance was assessed as   a longitudinal trait. These findings are encouraging for commercial   trout production. The additive genetic variation detected for   resistance demonstrates that selectively breeding trout for   resistance to ERM, RTFS, and VHS will be successful, providing a   complementary approach to control these diseases. The weak genetic   correlations suggest that it should be relatively easy to improve   resistance to each of the diseases simultaneously.    (VHS); (VHSv); (viral hemorrhagic septicemia); (viral haemorrhagic   septicaemia); (viral hemmorrhagic septicemia)

Status
In progress
Type
Project
Start Date
End Date
Publication
Researchers
Mark HenryonPrincipal Investigator
Associated with 1 projects
Peer BergResearcher
Associated with 1 projects
Torben E. KjaerResearcher
Associated with 1 projects
Agencies

Funding 1 projects for a total of $0.00
Scope of Study
Laboratory Investigation
Scale of Phenomena
Cellular
Organism
Impact of Pollutants
Exotic Species
Resource Management
Fisheries
Biology And Life History
Parasites and Diseases
Annex Numbers
Research & Development
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats
General
Annex
  • Annex Numbers
    Annex Numbers
    Research & Development
  • Annex 17
    Annex 17
    Impact of water quality and AIS on fish and wildlife populations and habitats

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