Genetic co-variation between resistance against both Caligus rogercresseyi and Piscirickettsia salmonis, and body weight in Atlantic salmon (Salmo salar)

José M. Yáñez, Jean P. Lhorente, Liane N. Bassini, Marcela Oyarzún, Roberto Neira, Scott Newman

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

Infectious and parasitic diseases are recognized worldwide as primary causes of economic losses in salmon production. Piscirickettsia salmonis and Caligus rogercresseyi are the main diseases affecting the Chilean salmon aquaculture. In this study, we used data from experimental challenges against P. salmonis and C. rogercresseyi in full- and half-sibs from 118 families belonging to a Salmo salar breeding nucleus. Resistance against P. salmonis (SRS) was defined as the day of death of each fish and C. rogercresseyi resistance (CAL) was measured as the parasite load. We also measured body weight (BW) in full-sibs of the tested fish. We used a multi-trait animal model to estimate (co)variance components and to calculate genetic parameters. For BW we included contemporary group (sex*tank) as factor and age as a covariate. In addition, tank was included as a factor and weight at the end of test as a covariate for SRS and CAL. The estimated heritabilities for BW, SRS and CAL were 0.4 (±. 0.05), 0.18 (±. 0.03) and 0.1 (±. 0.03), respectively. The genetic correlations between BW-SRS, BW-CAL and SRS-CAL were - 0.19 (±. 0.12), - 0.32 (±. 0.14) and - 0.02 (±. 0.17), respectively. The levels of genetic variation and the magnitude of the genetic correlations between resistance to P. salmonis, C. rogercresseyi and body weight found in the present study demonstrate the feasibility for the improvement of these traits simultaneously by means of selective breeding.

Original languageEnglish
Pages (from-to)295-298
Number of pages4
JournalAquaculture
Volume433
DOIs
Publication statusPublished - 20 Sep 2014

Keywords

  • Disease resistance
  • Genetic correlations
  • Heritability
  • Salmo salar

ASJC Scopus subject areas

  • Aquatic Science

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