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Published on: January 19, 2018
CTmax in brook trout (Salvelinus fontinalis) embryos shows an acclimation response to developmental temperatures but
Emily R Lechner1, Erin M C Stewart1, Chris C Wilson2
1Environmental and Life Sciences Graduate Program, Trent University, Peterborough, Ontario, Canada.
Abstract:
Critical thermal maximum (CTmax ) is widely used to measure upper thermal tolerance in fish but is rarely examined in embryos. Upper thermal limits generally depend on an individual's thermal history, which molds plasticity. We examined how thermal acclimation affects thermal tolerance of brook trout (Salvelinus fontinalis) embryos using a novel method to assess CTmax in embryos incubated under three thermal regimes. Warm acclimation was associated with an increase in embryonic upper thermal tolerance. However, CTmax variability was markedly higher than is typical for juvenile or adult salmonids.
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