Relationship between early or late resistance to acute temperature or hypoxia stresses in six rainbow trout isogenic lines

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Lagarde, Henri | Prchal, Martin | Pouil, Simon | Goardon, Lionel | Bideau, Marjorie | Guyvarc'h, François | Labbé, Laurent | Dechamp, Nicolas | Phocas, Florence | Dupont-Nivet, Mathilde | Lallias, Delphine

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International audience. Rainbow trout (Oncorhynchus mykiss) is a fish that is particularly sensitive to changes inwater quality. Global warming is expected to increase the frequency and intensity ofheatwaves, resulting in more common combined acute hyperthermia and hypoxiaconditions in fish farms (Reid et al., 2019). Such poor thermal and oxygenationconditions induce problems including growth losses, increased mortality and pathogenspressure. However, genetic selection to breed more robust fish is an interesting option toimprove fish tolerance to non-optimal water quality (Vandeputte and Prunet, 2002).Some research studies have already highlighted the potential of genetic selection foracute hypoxia and temperature resistance traits in fish (Chen et al., 2015; Ineno et al.,2005; Prchal et al., Unpublished data). In order to improve our understanding of thegenetic architecture of these two traits, we used six isogenic rainbow trout lines. Withina line, all fish have the same genotype and preliminary tests revealed contrasting levelsof resistance to hypoxia and temperature between lines. Using this research model, theobjectives of the study were to: i) confirm the existence of genetic variability forresistance to hypoxia and high temperature; ii) investigate the ranking stability ofgenotypes at different ages for hyperthermia and hypoxia resistance traits, which is anessential information to determine the stage at which fish should be phenotyped in abreeding program; iii) determinate the relationship between hyperthermia resistance andhypoxia resistance

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