Abstract

Relative heating and cooling rates were determined simultaneously with heart and opercular beat rates in bass subjected to sudden increases or decreases of 10–20°C in ambient water temperature. 1. 2. Cooling rates exceeded heating rates up to 90% of the equilibrium temperature, but equilibrium was usually reached sooner during heating. 2. 3. Heart and opercular beat rates were closely synchronized (1:1) during heating and cooling. 3. 4. Heart and opercular beat rates were greater for a given temperature during heating than during cooling; however, the initially greater rates during cooling may contribute to initially faster cooling.

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