Quantitative genetic variation of resistance against Piscirickettsia salmonis in Atlantic salmon (Salmo salar)

Yáñez, José M.; Bangera, Rama; Lhorente, Jean Paul; Oyarzún, Marcela; Neira, Roberto

doi:10.1016/j.aquaculture.2013.08.009

Cited by 77 publications

(75 citation statements)

References 16 publications

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“…The discrepancies between family rankings observed in our study suggested that the ranking of families will vary substantially depending on the models used for genetic evaluation. However, results from other studies showed very high correlations between EBVs for different models and trait definitions (Bangera et al., ; Kettunen, Serenius, & Fjalestad, ; Yáñez et al., ).…”

Section: Discussionmentioning

confidence: 86%

“…In the present study, heritability estimates of 0.16 and 0.17 were obtained for resistance to columnaris when survival time was used for parameter estimation. In other studies, heritability estimates for resistance to bacterial diseases measured as a continuous trait ranged between 0.18 and 0.40 for resistance to piscirickettsiosis in Atlantic salmon (Yáñez, Bangera, Lhorente, Oyarún, & Neira, ) and 0.35 for resistance to bacterial cold‐water disease (BCWD) in rainbow trout (Silverstein et al., ). In the present study, when survival was considered as a binary, heritability estimates of 0.14 and 0.15 were obtained for binary linear animal and sire‐dam models, respectively, which were comparable to previous studies, for example, 0.17 for resistance to francisellosis disease in farmed Atlantic cod (Bangera et al., ).…”

Section: Discussionmentioning

confidence: 96%

“…However, an estimate of 0.30 was obtained when the data were analysed under a threshold sire‐dam model compared to 0.15 for an animal model. In Atlantic salmon, heritability estimates were high (0.59) for survival to furunculosis (Ødegård et al., ) and moderate (0.20) for survival to salmon PD virus (Norris, Foyle, & Ratcliff, ) and for resistance to piscirickettsiosis (0.23) (Yáñez et al., ) when the traits were measured as binary outcomes. Heritability estimates of 0.38 and 0.52 were obtained for resistance against Streptococcus agalactiae and S. iniae in Nile tilapia under a linear animal model (LaFrentz et al., ; Shoemaker et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…For instance, Yáñez et al. () compared linear, threshold and proportional hazard models in the analysis of resistance against piscirickettsiosis in Atlantic salmon. Accuracy of selection was highest for the Cox model (0.79) using time until death as well as censored data in the prediction.…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Genetic parameters for resistance against Flavobacterium columnare in Nile tilapia Oreochromis niloticus (Linnaeus, 1758)

Wonmongkol

Sukhavachana

Ampolsak

et al. 2017

Journal of Fish Diseases

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Columnaris disease is a major cause of mortality in tilapia hatcheries and commonly occurs during the summer season in Thailand. One way of reducing the problem is by selective breeding for increased disease resistance. The objective of this study was to estimate quantitative genetic parameters for resistance against columnaris in the Chitralada 4 strain of Nile tilapia. Data from 43 full-sib families (2,580 records) of fry (age = 32 ± 4 days post-hatch) were used in the analyses. Initially, fry were subjected to bath challenge with Flavobacterium columnare (LD concentration = 1.2 × 10 CFU/ml) for 14 days. Disease resistance was defined as the number of days from challenge until death (DD) or as a binary trait (dead/alive) on day 14. Linear animal and sire-dam models were used for DD, while threshold animal, threshold sire-dam, binary linear animal and binary linear sire-dam models were used for binary outcomes. Covariate effect of age, fixed effect of challenge day and random effects of the individual animals or sires and dams were included in the models. Mean survival was 32.4 ± 11.6%, and survival rates of the best and poorest families were 70% and 8%, respectively. The highest estimate of heritability (0.30 ± 0.025) was obtained under the threshold sire-dam model. Heritability estimates for DD (0.16 ± 0.034 and 0.17 ± 0.046) were comparable to those obtained from the threshold animal (0.15 ± 0.031) and the binary linear (0.14 ± 0.045 and 0.15 ± 0.044) models. The linear animal and sire-dam models for DD and the threshold sire-dam models performed equally with similar values of r (0.629, 0.628 and 0.627) and accuracy of selection (0.793, 0.793 and 0.791). This study reveals the potential of selective breeding to increase disease resistance to F. columnare in the studied population of Nile tilapia.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Genetic parameters for resistance against Flavobacterium columnare in Nile tilapia Oreochromis niloticus (Linnaeus, 1758)

Wonmongkol

Sukhavachana

Ampolsak

et al. 2017

Journal of Fish Diseases

View full text Add to dashboard Cite

show abstract

“…Model comparisons in terms of the accuracy of selection to predict family survival indicated that the linear animal model and the Cox model performed equally although the latter model utilized all data in the analysis. As reported in the previous studies, the use of the Cox model offered slight advantage over the linear animal and threshold models for genetic analyses of disease resistance in Atlantic salmon (Ødegård et al, ; Yáñez et al, ) and Atlantic cod (Kettunen, Serenius, & Fjalestad, ). However, the Cox sire–dam model outperformed the linear binary and threshold models in predicting family EBVs for resistance to white spot syndrome virus (WSSV) in the Pacific white shrimp (Gitterle et al, ).…”

Section: Discussionmentioning

confidence: 90%

Selection response for Streptococcus agalactiae resistance in Nile tilapia Oreochromis niloticus

Suebsong

Poompuang

Srisapoome

et al. 2019

Journal of Fish Diseases

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The potential of selection to improve resistance to streptococcosis was evaluated in a commercial population of Nile tilapia in Thailand. The base generation (G0) consisted of offspring from 98 sires and 149 dams using a partly nested design. At 60 days post‐hatch, 30 fish from each family were injected intraperitoneally with a Streptococcosis agalactiae solution (1 × 109 CFU/ml) and evaluated for 14 days. Disease resistance was recorded as the number of days from challenge until death (DD) and as a binary (BIN) trait (dead/alive) on day 14. Three models were used for genetic analyses: Cox frailty model for DD; animal model for DD; and animal model for BIN. Age at challenge was fitted as a covariate and contemporary group as fixed or random effect, depending on the model. Fish from the 18 most resistant families were selected to produce the first generation (G1). Heritability estimates for G0 were 0.22, 0.14 ± 0.02 and 0.11 ± 0.02 for the Cox, linear DD and linear BIN models, respectively. Selection response indicated that the risk of death decreased to 54%, survival time increased to 3.4 days and survival rate increased to 21%. These results suggest that genetic improvement is possible for this population.

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Genetic Improvement of North American Atlantic Salmon and the Eastern Oyster Crassostrea virginica at the U.S. Department of Agriculture–Agricultural Research Service National Cold Water Marine Aquaculture Center

et al. 2020

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United States marine aquaculture industries, which consist primarily of molluscan shellfish and Atlantic Salmon Salmo salar were valued at US$192 million in 2016. Coldwater marine aquaculture production has great potential for expansion, and both Atlantic Salmon and eastern oysters Crassostrea virginica are widely accepted as seafood by American consumers. Commercial salmon and oyster producers predominantly use stocks that are not many generations removed from wild, unselected stocks, so there is a need for continuous support to this industry through breeding programs. The National Cold Water Marine Aquaculture Center (NCWMAC) is the only long‐term program for developing genetically improved salmon and tools for the genetic improvement of eastern oysters in support of the U.S. coldwater marine aquaculture industry. The objectives of the program are to (1) expand and optimize approaches for multitrait selection in Atlantic Salmon and (2) advance genetic improvement technologies for the eastern oyster. Heritabilities for fillet color and fat, sea lice resistance, and growth of Atlantic Salmon were determined. The average gutted carcass weight for the genetically improved salmon was 5.91 kg/fish compared with 3.19 kg/fish for the control strain. The purpose of this article is to describe the current status of the NCWMAC research programs and summarize recent genetics gains.

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Quantitative genetic variation of resistance against Piscirickettsia salmonis in Atlantic salmon (Salmo salar)

Cited by 77 publications

References 16 publications

Genetic parameters for resistance against Flavobacterium columnare in Nile tilapia Oreochromis niloticus (Linnaeus, 1758)

Genetic parameters for resistance against Flavobacterium columnare in Nile tilapia Oreochromis niloticus (Linnaeus, 1758)

Selection response for Streptococcus agalactiae resistance in Nile tilapia Oreochromis niloticus

Genetic Improvement of North American Atlantic Salmon and the Eastern Oyster Crassostrea virginica at the U.S. Department of Agriculture–Agricultural Research Service National Cold Water Marine Aquaculture Center

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