Comparison of disease resistance between diploid, induced-triploid, and intercross-triploid rainbow trout including trout selected for resistance to Flavobacterium psychrophilum

All-female triploid fish are advantageous in rainbow trout (Oncorhynchus mykiss) aquaculture due to sterility and the consequent superior filet quality, growth, and feed conversion achieved at reproductive size. Triploid fish are commonly produced by pressure or temperature shock of the zygote (indu...

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Bibliographic Details
Published in:Aquaculture 2013-10, Vol.410-411, p.66-71
Main Authors: Weber, Gregory M., Wiens, Gregory D., Welch, Timothy J., Hostuttler, Mark A., Leeds, Timothy D.
Format: Article
Language:English
Subjects:
Agnatha. Pisces
Animal aquaculture
animal breeding
Animal diseases
Animal productions
Aquaculture
bacterial infections
Biological and medical sciences
Breeding
Comparative studies
crossing
diploidy
Disease resistance
etiological agents
Fish
fish diseases
Flavobacterium psychrophilum
Fundamental and applied biological sciences. Psychology
General aspects
Oncorhynchus mykiss
parents
Polyploidy
Salmonid
Survival analysis
Tetraploid
tetraploidy
triploidy
Trout
Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution
zygote
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Summary:All-female triploid fish are advantageous in rainbow trout (Oncorhynchus mykiss) aquaculture due to sterility and the consequent superior filet quality, growth, and feed conversion achieved at reproductive size. Triploid fish are commonly produced by pressure or temperature shock of the zygote (induced-triploids, 3NP), but can also be produced by mating a tetraploid parent with a diploid (2N) parent (intercross-triploids, 3NC). Little is known about the disease resistance of 3NC fish. In this study, we measured post-challenge survival of genetically-related 2N, 3NP and 3NC families after exposure to Flavobacterium psychrophilum the etiological agent of bacterial cold water disease (BCWD). The families used in this study originated from either an unselected commercial stock or BCWD resistant or susceptible line of rainbow trout. The overall survival of 2N fish was slightly higher than the respective 3NP and 3NC fish. Although 3NC fish tended to show higher survival than 3NP fish, this response was not sufficiently consistent to promote intercross production of triploids for increasing disease resistance. The survival of ten sets of 3NP, 3NC and 2N families, created from BCWD resistant and susceptible line parents, demonstrated overall similar inherent relative survival differences among the ploidy types both among families and between lines, although family differences in response to triploidization and triploidization strategy were observed. In summary, minimal survival difference between 3NP and 3NC families following experimental challenge suggests that innate resistance to F. psychrophilum is not substantially altered by the triploidization strategy and progress in family-based selective breeding of diploid fish for BCWD resistance will substantially translate into improved survival when triploids are derived either by shock treatment or intercross breeding. •Genetic improvement for resistance to BCWD as diploids is maintained in triploids.•Effect of triploidy and triploidy approach on disease resistance varies with family.•Induced-triploids and intercross-triploids show similar resistance to BCWD.•Survival of triploids is generally poorer than diploids in BCWD challenges.
ISSN:0044-8486
1873-5622
DOI:10.1016/j.aquaculture.2013.06.014