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Fig. 4. (A) Heart rate (fH) and (B) stroke volume
(Vs) of resting (•) and swimming (
) sockeye
salmon during an acute temperature increase of 2°C h–1.
Before swimming, a resting value was obtained at 15°C (
). At the end
of the acute temperature increments, the water velocity for the swimming fish
was immediately decreased to the resting value and the temperature was
decreased to 15°C over an hour for both groups before a recovery
measurement was conducted. All values are means ± s.e.m. Different
letters indicate significant differences between temperatures within a group,
whereas an asterisk indicates a significant difference between resting and
swimming fish at a given temperature.
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