|Leeds, Timothy - Tim|
|LAPATRA, SCOTT - Clear Springs Foods, Inc|
|Wiens, Gregory - Greg|
Submitted to: Plant and Animal Genome Conference
Publication Type: Abstract Only
Publication Acceptance Date: 12/9/2014
Publication Date: 1/14/2015
Citation: Evenhuis, J., Leeds, T.D., Marancik, D.P., Lapatra, S., Wiens, G.D. 2015. Rainbow Trout (Oncorhynchus mykiss) resistance to columnaris disease is heritable and favorably correlated with bacterial cold water disease resistance. Plant and Animal Genome Conference. P223.
Technical Abstract: Columnaris disease (CD) is an emerging disease affecting rainbow trout aquaculture. Objectives were to estimate heritability of CD resistance in a line (ARS-Fp-R) selected 4 generations for improved bacterial cold water disease (BCWD) resistance; estimate genetic correlations among CD resistance, BCWD resistance, and growth traits; and compare CD resistance among ARS-Fp-R, ARS-Fp-S (selected 1 generation for increased BCWD susceptibility), and ARS-Fp-C (selection control) lines. Heritability of CD resistance was estimated using data from waterborne challenge of 44 full-sib ARS-Fp-R families, and genetic correlations were estimated using these data and 5 generations of BCWD resistance and 9- and 12-month body weight data from 405 ARS-Fp-R families. Heritability estimates were similar for CD (0.17 +/- 0.09) and BCWD (0.18 +/- 0.03) resistance, and genetic correlation was favorable (0.35 +/- 0.18). Genetic correlations were small and antagonistic (-0.15 +/-0.09 to -0.19 +/- 0.17) between resistance traits and 9- and 12-month body weights. Two challenges were conducted to compare CD resistance among genetic lines. ARS-Fp-R (83% survival) had greater CD resistance than ARS-Fp-C (73.5%; P=0.02) and ARS-Fp-S (68%; P<0.001) families, which did not differ (P=0.16), in the first challenge, and greater resistance (56% survival) than ARS-Fp-S (38% survival; P=0.02) families in the second challenge using ~2.5-fold greater challenge dose. Favorable correlation between CD and BCWD resistance is supported by greater CD resistance of the ARS-Fp-R line, and suggests both traits will be improved when selection is practiced on only one trait. These data support further selective breeding of the ARS-Fp-R line for increased CD resistance to produce a double pathogen resistant line.