Body Size and Temperature Sensitivity in the Cichlid Fish, Aequidens portalegrensis (Hensel)

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Abstract
Temperature sensitivity was determined by acute measurements of oxygen consumption over the temperature range from 22[degree] to 32[degree]C. There was no evidence that larvae a few days of age made any compensatory adjustments for either heat or cold stress. Young fish, having a wet weight of less than 6.0 g are better able to make rapid adjustments to cold stress than are larger animals. Large fish, having a wet weight of more than 7.0 g are better able to make rapid compensatory adjustments to high temperature stress than are small fish. These responses result in a lower Q10 of small fish as compared with large ones when acute measurements are made on animals having a reasonably stable thermal history.

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