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            <funder>This study was funded by an Ifremer site political project.</funder>
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                <term xml:lang="en">Muscle biopsy</term>
                <term xml:lang="en">Rainbow trout</term>
                <term xml:lang="en">Hypoxia resistance</term>
                <term xml:lang="en">Swimming performance</term>
                <term xml:lang="en">Morphological aftercare</term>
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              <p>Muscular biopsy is a non-lethal muscle sampling technique that allows for the fish to be returned to its natural environment or its tank after sampling. This technique offers the opportunity for the fish farmers and scientific community to carry out assays on very small muscle samples (between 1 and 40 mg) such as lipid composition, trace element and heavy metal levels or muscle energetic metabolism to evaluate, for instance, the health of the fish. The aim of the present study was to determine if a red muscle biopsy affects rainbow trout (Oncorhynchus mykiss) physiological performances (swimming and hypoxia resistances) and their survival. Fish that had a biopsy (n=30) or not (n=30) were subsequently tested for either a hypoxia resistance test (HRT) or a swimming resistance test (SRT) which were conducted 7- and 10-days post-surgery (dps), respectively. Results showed that biopsy had no effect on hypoxia resistance and on swimming parameters (tail beat frequency, sustained and critical swimming speeds, standard and maximal oxygen consumptions). Even if no significant effect was observed between control and biopsy groups on morphometric parameters (body weight variation and condition factors), all the trout lost weight which can be explained by a post-surgery trauma such as local inflammation or human manipulation stress. Furthermore, body weight variation was significantly more important for the 7-dps group compared to the 10-dps group which had the opportunity to eat three more days compared to the 7-dps trout. Corroborated with the principal component analysis, red muscle biopsy can be considered as a relevant approach as it had no effect on whole-animal performance and it did not affect their survival.</p>
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