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An analysis of the energetic cost of the branchial and cardiac pumps during sustained swimming in trout

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Abstract

Experimental data are available for the oxygen cost of the branchial and cardiac pumps in fish. These data were used to theoretically analyze the relative oxygen cost of these pumps during rest and swimming in rainbow troutSalmo gairdneri. Efficiency of the heart increases with activity and so the relative oxygen cost of the cardiac pumps decreased from 4.6% at rest to 1.9% at the critical swimming speed. The relative oxygen cost of the branchial pump is significant in the resting and slowly swimming fish, being 10 to 15% of total oxygen uptake. However, when swimming trout switch to a ram mode of ventilation, a considerable saving in oxygen cost is accrued by switching the cost of ventilation from the branchial to the tail musculature. Thus, the relative oxygen cost of the branchial and cardiac pumps actually decreases at critical swimming speed compared to rest and therefore is unlikely to be a major limiting factor in maximum oxygen delivery to the tissues.

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Authors and Affiliations

  1. Department of Biological Sciences, Simon Fraser University, V5A IS6, Burnaby, B.C., Canada

    A. P. Farrell & J. F. Steffensen

  2. Department of Zoophysiology, University of Aarhus, DK-8000, Aarhus C, Denmark

    J. F. Steffensen

Authors
  1. A. P. Farrell
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  2. J. F. Steffensen
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Farrell, A.P., Steffensen, J.F. An analysis of the energetic cost of the branchial and cardiac pumps during sustained swimming in trout. Fish Physiol Biochem 4, 73–79 (1987). https://doi.org/10.1007/BF02044316

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