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

Henryon, Mark; Berg, Peer; Olesen, Niels Jørgen; Kjær, Torben Egil; Slierendrecht, W.J.; Jokumsen, Alfred; Lund, Ivar

doi:10.1016/j.aquaculture.2004.12.022

Cited by 125 publications

(90 citation statements)

References 14 publications

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“…Posterior credible intervals did not include these values. Similar and mainly higher estimates of heritability for survival (0.2-0.74) were found in studies evaluating tilapia in Brackish water (Luan et al, 2008) or under different temperatures (Chiayvareesajja et al, 1999), and rainbow trout exposed to different causative agents of disease (Henryon et al, 2005). However, in these experiments, fish were subjected to challenge.…”

Section: Resultsmentioning

confidence: 66%

“…Other studies, which examined the genetic control of body weight and survival in tilapia, could not successfuly estimate those correlations (Charo-Karisa et al, 2006;Luan et al, 2008) or estimated the parameter with high imprecision (Rezk et al, 2009). Henryon et al (2005) also used a Bayesian approach to estimate survival parameters, but as a measure of fish resistance to diseases across time. Since the association between survival and weight was only indirectly assessed through a longitudinal approach, the authors did not obtain correlation between these traits.…”

Section: Resultsmentioning

confidence: 99%

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Bayesian genetic parameters for body weight and survival of Nile tilapia farmed in Brazil

Santos

Ribeiro

Vargas

et al. 2011

Pesq. agropec. bras.

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-The objective of this study was to estimate genetic parameters for survival and weight of Nile tilapia (Oreochromis niloticus), farmed in cages and ponds in Brazil, and to predict genetic gain under different scenarios. Survival was recorded as a binary response (dead or alive), during harvest time in the 2008 grow-out period. Genetic parameters were estimated using a Bayesian mixed linear-threshold animal model via Gibbs sampling. The breeding population consisted of 2,912 individual fish, which were analyzed together with the pedigree of 5,394 fish. The heritabilities estimates, with 95% posterior credible intervals, for tagging weight, harvest weight and survival were 0.17 (0.09-0.27), 0.21 (0.12-0.32) and 0.32 (0.22-0.44), respectively. Credible intervals show a 95% probability that the true genetic correlations were in a favourable direction. The selection for weight has a positive impact on survival. Estimated genetic gain was high when selecting for harvest weight (5.07%), and indirect gain for tagging weight (2.17%) and survival (2.03%) were also considerable.Index terms: Oreochromis niloticus, correlation, fish genetic improvement, Gibbs sampling, GIFT strain, heritability. Parâmetros genéticos bayesianos para peso corporal e sobrevivência de tilápias-do-nilo cultivadas no BrasilResumo -O objetivo deste trabalho foi estimar parâmetros genéticos para a sobrevivência e peso de tilápias-do-nilo (Oreochromis niloticus), cultivadas em tanques-rede e viveiro de terra no Brasil, e predizer o ganho genético sob diferentes cenários. Mediu-se a sobrevivência como uma característica binária (peixe vivo ou morto), no período de crescimento de 2008 até a despesca. Os paramêtros genéticos foram estimados pelo modelo animal limiar-linear em análise bayesiana, pela amostragem de Gibbs. A população avaliada foi de 2.912 peixes individuais, que foram analisados juntamente com o pedigree de 5.394 peixes. As herdabilidades, com intervalos de credibilidade de 95%, obtidas para peso à identificação, peso à despesca e sobrevivência foram 0,17 (0,09-0,27), 0,21 (0,12-0,32) e 0,32 (0,22-0,44), respectivamente. Intervalos de credibilidade mostram 95% de probabilidade de que as verdadeiras correlações genéticas estejam em uma direção favorável. A seleção para peso tem impacto positivo na sobrevivência. O ganho genético estimado foi alto para a seleção quanto ao peso à despesca (5,07%), e o ganho indireto para o peso à identificação (2,17%) e à sobrevivência (2,03%) também foram consideráveis.Termos para indexação: Oreochromis niloticus, correlação, melhoramento genético de peixes, amostragem de Gibbs, linhagem GIFT, herdabilidade.

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Bayesian genetic parameters for body weight and survival of Nile tilapia farmed in Brazil

Santos

Ribeiro

Vargas

et al. 2011

Pesq. agropec. bras.

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“…Economic losses from F. psychrophilum are due to direct mortality and also to deformities in fish that survive infection (10,11). There are several reasons why selective breeding for BCWD/ RTFS is warranted: 1) the pathogen is widely distributed, and thus prevention is not feasible; 2) there is, at present, no commercial vaccine for BCWD or RTFS, and salmonids can be infected at the egg and fry stages (10,(12)(13)(14) before developing full immune system maturation and thus potentially compromising the utility of vaccination; 3) limited chemotherapeutics are availaible as only one drug, florfenicol is currently approved for treatment of BCWD in the U.S. (15); and 4) additive genetic variation for resistance to F. psychrophilum was demonstrated in a Danish rainbow trout population, indicating a favorable potential for selective breeding for increased resistance (16). In 2002, the National Center for Cool and Cold Water Aquaculture (NCCCWA) initiated a breeding program to increase rainbow trout growth rate and stress resistance (17).…”

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confidence: 99%

Spleen Size Predicts Resistance of Rainbow Trout to Flavobacterium psychrophilum Challenge

Hadidi

Glenney

Welch

et al. 2008

The Journal of Immunology

152

119

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Selective breeding of animals for increased innate resistance offers an attractive strategy to control disease in agriculture. However, this approach is limited by an incomplete knowledge of the heritability, duration, and mechanism(s) of resistance, as well as the impact of selection on the immune response to unrelated pathogens. Herein, as part of a rainbow trout broodstock improvement program, we evaluated factors involved in resistance against a bacterial disease agent, Flavobacterium psychrophilum. In 2005, 71 full-sibling crosses, weighing an average of 2.4 g, were screened, and resistant and susceptible crosses were identified. Naive cohorts were evaluated at 10 and 800 g in size, and most maintained their original relative resistant or susceptible phenotypes, indicating that these traits were stable as size increased >300-fold. During the course of these studies, we observed that the normalized spleen weights of the resistant fish crosses were greater than those of the susceptible fish crosses. To test for direct association, we determined the spleen-somatic index of 103 fish crosses; created high, medium, and low spleen-index groups; and determined survival following challenge with F. psychrophilum or Yersinia ruckeri. Consistent with our previous observations, trout with larger spleen indices were significantly more resistant to F. psychrophilum challenge; however, this result was pathogen-specific, as there was no correlation of spleen size with survival following Y. ruckeri challenge. To our knowledge, this is the first report of a positive association between spleen size and disease resistance in a teleost fish. Further evaluation of spleen index as an indirect measure of disease resistance is warranted.

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“…Resistances to different mortality factors do not necessarily share a common genetic determination (Gjøen et al, 1997;Henryon et al, 2005;Bubliy & Loeschcke, 2005;Ødega˚rd et al, 2007 ;Kjøglum et al, 2008). This is for example highlighted by the fact that moderate genotyperenvironment interaction was also found for rainbow trout survival during the grow-out period, as shown by the non-unity genetic correlations between environments (Vehvila¨inen et al, 2008 ;present study).…”

Section: (Iii) Factors Causing Weak Correlations Between Life Stagesmentioning

confidence: 89%

“…At the same time, however, these studies report that genetic correlations with other mortality factors, even within life stage, can be weak. In Atlantic salmon (Salmo salar), resistance against different bacterial diseases is usually favourably genetically correlated, whereas the genetic correlations between bacterial and viral diseases are weak or even negative (Gjøen et al, 1997 ;Henryon et al, 2005 ;Ødega˚rd et al, 2007 ;Kjøglum et al, 2008). Bubliy & Loeschcke (2005) also showed that survival after different stressors in a fruit fly (Drosophila melanogaster) exhibit correlated responses to selection, even though results did not support existence of a single resistance mechanism.…”

Section: (I) Survival Within Fingerling Stagementioning

confidence: 99%

Genetic architecture of rainbow trout survival from egg to adult

Vehviläinen

Kause

Koskinen³

et al. 2010

Genet. Res.

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SummarySurvival from birth to a reproductive adult is a challenge that only robust individuals resistant to a variety of mortality factors will overcome. To assess whether survival traits share genetic architecture throughout the life cycle, we estimated genetic correlations for survival within fingerling stage, and across egg, fingerling and grow-out stages in farmed rainbow trout. Genetic parameters of survival at three life cycle stages were estimated for 249 166 individuals originating from ten year classes of a pedigreed population. Despite being an important fitness component, survival traits harboured significant but modest amount of genetic variation (h 2 =0 . 07-0 . 27). Weak associations between survival during egg-fry and fingerling periods, between early and late fingerling periods (r G =0 . 30) and generally low genetic correlations between fingerling and grow-out survival (mean r G =0 . 06) suggested that life-stage specific survival traits are best regarded as separate traits. However, in the sub-set of data with detailed time of death records, positive genetic correlations between early and late fingerling survival (r G =0 . 89) showed that during certain years the best genotypes in the early period were also among the best in the late period. That survival across fingerling period can be genetically the same, trait was indicated also by only slightly higher heritability (h 2 =0 . 15) estimated with the survival analysis of time to death during fingerling period compared to the analysis treating fingerling survival as a binary character (h 2 =0 . 11). The results imply that (1) inherited resistance against unknown mortality factors exists, but (2) ranking of genotypes changes across life stages.

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

Cited by 125 publications

References 14 publications

Bayesian genetic parameters for body weight and survival of Nile tilapia farmed in Brazil

Bayesian genetic parameters for body weight and survival of Nile tilapia farmed in Brazil

Spleen Size Predicts Resistance of Rainbow Trout to Flavobacterium psychrophilum Challenge

Genetic architecture of rainbow trout survival from egg to adult

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