Abstract
Maximum aerobic swimming speed (Ucrit) and in situ cardiac performance were examined in rainbow trout acclimated to 8°C and 18°C. Heart rate, maximum cardiac power output and maximum power output were similar to in vivo values reported for rainbow trout swimming at Ucrit, and were significantly higher than previous values reported for perfused trout heart preparations in which the pericardium was disrupted. The Q10 values for Ucrit (1.35), maximum cardiac output (1.26) and maximum cardiac power output (1.44) were all similar. A tight linkage is suggested between these performance parameters during temperature acclimation from 8 to 18°C in rainbow trout.
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