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The influence of swimming activity on water balance in the rainbow trout (Salmo gairdneri)

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Summary

  1. 1.

    In the freshwater adapted rainbow trout, urine flow markedly increased during periods of exercise in a swimming respirometer.

  2. 2.

    Over a range of oxygen consumptions from “standard” to nearly “active metabolic rates”, oxygen and water fluxes exhibited a highly significant positive correlation in individual fish. The results were indicative of covariation of the oxygen and water permeabilities of the gills.

  3. 3.

    A triphasic fluctuation in body weight, considered a measure of water balance, occurred during the course of exercise. On the basis of weight change and urine flow data, a tentative model of water regulation during swimming is presented.

  4. 4.

    Urinary levels of sodium and potassium tended to fall at high urine flows and rise at lowflows. Calcium and magnesium concentrations underwent simultaneous fluctuations which did not always correspond to alterations in urine volume.

  5. 5.

    The renal excretion rates of all four cations increased significantly during swimming activity.

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Author notes

  1. Chris M. Wood

    Present address: School of Biological Sciences, University of East Anglia, Norwich NOR 88C, England

Authors and Affiliations

  1. Department of Zoology, University of British Columbia, Vancouver, B. C.

    Chris M. Wood & D. J. Randall

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  1. Chris M. Wood
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  2. D. J. Randall
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Additional information

The authors wish to thank Dr. M. Newman and the Vancouver Public Aquarium for provision of research space, and Miss O. Johannsson and Mr. D. Walland for their assistance in use of computing facilities. The comments of Dr. G. Shelton and Dr. P. C. Croghan were greatly appreciated. This work was supported by grants from the National Research Council of Canada and the British Columbia Heart Foundation.

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Wood, C.M., Randall, D.J. The influence of swimming activity on water balance in the rainbow trout (Salmo gairdneri). J. Comp. Physiol. 82, 257–276 (1973). https://doi.org/10.1007/BF00694239

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  • DOI: https://doi.org/10.1007/BF00694239

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