Rainbow trout (Oncorhynchus mykiss) adaptation to a warmer climate: the performance of an improved strain under farm conditions

Crichigno, Sonia Alejandra; Cussac, Víctor E.

doi:10.1007/s10499-019-00438-7

Cited by 9 publications

(15 citation statements)

References 30 publications

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“…Evidence of the effect of a different (wild, thermal‐adapted) male parental genome can be identified here only in the lower percentage of incompletely hatched embryos in the F1 families, in agreement with the lower incidence of complex malformations in F1 than in farmed families observed by Crichigno and Cussac (2019). This difference in the percentage of incompletely hatched embryos could have several causes, e.g ., the functionality of the hatching enzyme, the biochemical characteristics of the vitelline envelope or embryo movement (Kunz, 2004).…”

Section: Discussionsupporting

confidence: 89%

“…This cross was selected due to the availability of semen of Valcheta males in autumn and the autumn spawning of females from the Centro de Salmonicultura, Bariloche (CENSALBA). Crichigno and Cussac (2019) showed that thermal tolerance varied within unselected F1 families. When these juveniles were acclimated to 20.5 C over c. 109 days, them they preferred a mean temperature of 20.2 ± 0.2 C, so it appears that simple selection by growth could be all that is necessary before beginning the process of introducing these families into farmed lines.…”

Section: Introductionmentioning

confidence: 99%

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Thermal effects in rainbow trout (Oncorhynchus mykiss) F1 embryos (farmed female × wild thermal‐resistant male)

Crichigno

Orellana

Larraza

et al. 2021

Journal of Fish Biology

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The aim of this work was to investigate the response of rainbow trout embryos (Oncorhynchus mykiss) (i.e., survival, size at hatching, time to hatching, malformations) to four incubation temperatures (5.8, 8.9, 14.0 and 16.8 C), taking into account the origin of the male parental genome and comparing pure farmed and F1 embryos (farmed female × wild thermal-resistant male). Several consequences of thermal stress were observed: lower accumulated thermal units (ATU) at hatching at high temperatures, and lower survival, shorter hatched free embryos and less-consumed yolk sac at extreme temperatures. The effect of the thermal-adapted male parental genome was shown only in the lower percentage of incompletely hatched free embryos in the F1 families. It appears that to obtain greater modification of thermal performance during early development, the adapted genome of the wild thermalresistant population has to be included through maternal inheritance, thus producing a stabilized strain selected for domesticity, growth and thermal adaptation.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Thermal effects in rainbow trout (Oncorhynchus mykiss) F1 embryos (farmed female × wild thermal‐resistant male)

Crichigno

Orellana

Larraza

et al. 2021

Journal of Fish Biology

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show abstract

“…Moreover, sub-adults and adult progeny showed longer effective time under sublethal temperature, supporting improved thermotolerance of the F1 generation. These data may imply that warm temperature may have selected the F0 fish with genotypes that confer better thermal tolerance (WT group showed higher mortality), similarly to the reports of thermo-tolerant rainbow trout generated after several generations, as described both in the wild 34 , 35 and captivity 36 . Apart from the selection at individual level, each spermatogonia from the same gonad could respond to the same stress in a different way due to genetic differences caused by temperature-induced mutations during mitotic divisions.…”

Section: Discussionsupporting

confidence: 75%

Early warming stress on rainbow trout juveniles impairs male reproduction but contrastingly elicits intergenerational thermotolerance

Butzge

Yoshinaga

Acosta

et al. 2021

Sci Rep

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The exposure of adult fish to warm or high temperatures is known to impair reproduction, yet the long-term reproductive impacts for treatments at early life are not well clarified. This study aimed to evaluate the effects of warm temperature (WT) during juvenile stage on gonad maturation, gamete quality, and offspring thermotolerance in rainbow trout. While the comparison of basic reproductive parameters in WT females did not reveal any kind of impairment, many WT males showed an atrophied, undeveloped gonad, or a smaller testis with lower milt volume; sperm quality parameters in WT males and deformity rates in the respective progeny were also highly affected. However, despite of such negative effects, many of the remaining progeny presented better rates of survival and growth when exposed to the same conditions as those of parental fish (WT), suggesting that thermal stress in parr stage males elicited intergenerational thermotolerance after a single generation. The present results support that prolonged warming stress during early life stages can adversely affect key reproductive aspects, but contrastingly increase offspring performance at upper thermal ranges. These findings have implications on the capacity of fish to adapt and to cope with global warming.

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“…Moreover, sub-adults and adults progenies showed longer effective time under sublethal temperature, supporting improved thermotolerance of F1 generation. These data may imply that warm temperature may have selected the F0 fish with genotypes that confer better thermal tolerance (WT group showed higher mortality), similarly to the reports of thermo-tolerant rainbow trout generated after several generations, as described both in the wild 28 and captivity 29 . Alternatively, beneficial mutations may have been inserted into spermatogonia's genome or, considering the fast acquisition of thermal tolerance, epigenetic modifications (methylation or non-coding RNAs) may have been "imprinted" onto spermatogonia in response to thermal stress and those "signatures" would be carried by spermatozoa DNA to F1 progeny.…”

supporting

confidence: 74%

Early Warming Stress on Juvenile Fish Impairs Testicular Development and Sperm Quality But Contrastingly Elicits Intergenerational Thermotolerance

Butzge¹,

Yoshinaga²,

Acosta³

et al. 2021

Preprint

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The exposure of adult fish to warm or high temperatures is known to impair reproduction, yet the long-term reproductive impacts for treatments at early life are not well clarified. This study aimed to evaluate the effects of warm temperature (WT) during juvenile stage on gonad maturation, gamete quality, and offspring thermotolerance in rainbow trout. While the comparison of basic reproductive parameters in WT females did not reveal any kind of impairment, many WT males showed an atrophied, undeveloped gonad, or a smaller testis with lower milt volume; sperm quality parameters in WT males and deformity rates in the respective progeny were also highly affected. However, despite of such negative effects, many of the remaining progenies presented better rates of survival and growth when exposed to the same conditions as those of parental fish (WT), suggesting that thermal stress in parr stage males elicited intergenerational thermoresistance after a single generation . The present results support that prolonged warming stress during early life stages can adversely affect key reproductive aspects, but constrastingly increase offspring performance at upper thermal ranges. These findings have implications on the capacity of fish to adapt and to cope with global warming.

show abstract

Rainbow trout (Oncorhynchus mykiss) adaptation to a warmer climate: the performance of an improved strain under farm conditions

Cited by 9 publications

References 30 publications

Thermal effects in rainbow trout (Oncorhynchus mykiss) F1 embryos (farmed female × wild thermal‐resistant male)

Thermal effects in rainbow trout (Oncorhynchus mykiss) F1 embryos (farmed female × wild thermal‐resistant male)

Early warming stress on rainbow trout juveniles impairs male reproduction but contrastingly elicits intergenerational thermotolerance

Early Warming Stress on Juvenile Fish Impairs Testicular Development and Sperm Quality But Contrastingly Elicits Intergenerational Thermotolerance

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