Effects of temperature on brain tissue oxygen consumption in salmonid fishes

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Abstract
The oxygen consumption of brain tissue from Atlantic salmon and brook trout was determined at temperatures ranging from 6 °C to 30 °C for fish acclimated to 6° and 18 °C. In sucrose medium, oxygen consumption of brain homogenate was higher at all test temperatures for the 6 °C acclimated fish than for the 18 °C acclimated ones. Preparing brain tissue as a mince in saline medium markedly reduced the thermal acclimation effect. The latter preparation had much higher respiratory rates than did homogenate preparations. These differences were ascribed largely to an increase in ATPase activity in the ionic medium.

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