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  • Rapid carbon turnover during growth of Atlantic salmon (Salmo salar) smolts in sea water, and evidence for reduced food consumption by growth-stunts

    Author(s)
    Jardine, TD
    MacLatchy, DL
    Fairchild, WL
    Cunjak, RA
    Brown, SB
    Griffith University Author(s)
    Jardine, Timothy
    Year published
    2004
    Metadata
    Show full item record
    Abstract
    Wild Atlantic salmon smolts were captured during spring out-migration in the NorthwestMiramichi River, New Brunswick, Canada, and placed on an isotopically distinct hatchery diet to determine the relative contributions of growth and metabolic turnover to isotopic change. As expected for an ectothermic species, growth explained a large amount of isotopic variation in changing stable carbon ratios of muscle tissue (average r2 젰.46) for the 3 years of study. Turnover rates of muscle carbon in all 3 years in growing fish (0.24-0.66 month)1) were higher than previously reported values for other ectothermic species, but there was ...
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    Wild Atlantic salmon smolts were captured during spring out-migration in the NorthwestMiramichi River, New Brunswick, Canada, and placed on an isotopically distinct hatchery diet to determine the relative contributions of growth and metabolic turnover to isotopic change. As expected for an ectothermic species, growth explained a large amount of isotopic variation in changing stable carbon ratios of muscle tissue (average r2 젰.46) for the 3 years of study. Turnover rates of muscle carbon in all 3 years in growing fish (0.24-0.66 month)1) were higher than previously reported values for other ectothermic species, but there was little evidence for isotopic change in non-growers (average r2 젰.041, p>0.1). It is unlikely that nongrowers had consumed any of the hatchery diet over a 2-month period, thus preventing them from acquiring the new carbon isotopic signature. This period of food deprivation resulted in nitrogen-15 enrichment in liver relative to muscle (p 젰.003). It is advised that future isotope studies of metabolic turnover rates in ectotherms be conducted on slow-growing animals over a long time period. This would serve to avoid the obscuring effects of growth on isotopic change, and provide stronger comparisons to endothermic tissue turnover rates.
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    Journal Title
    Hydrobiologia
    Volume
    527
    Issue
    1
    DOI
    https://doi.org/10.1023/B:HYDR.0000043182.56244.f6
    Subject
    Earth sciences
    Oceanography not elsewhere classified
    Environmental sciences
    Biological sciences
    Publication URI
    http://hdl.handle.net/10072/29189
    Collection
    • Journal articles

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