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Related Experiment Videos

Heat transfer between fish and ambient water

E D Stevens, A M Sutterlin

    The Journal of Experimental Biology
    |August 1, 1976
    PubMed
    Summary

    Fish gills lose 80-90% of blood heat. Direct heat transfer in gill arteries accounts for remaining heat. Most metabolic heat escapes via the body wall and fins.

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    Area of Science:

    • Physiology
    • Thermoregulation
    • Ichthyology

    Background:

    • Fish gills play a crucial role in gas exchange and osmoregulation.
    • Understanding heat exchange in fish is vital for comprehending their physiological adaptations to aquatic environments.

    Purpose of the Study:

    • To quantify heat transfer efficiency of fish gills.
    • To determine the pathways of heat loss in the sea raven (Hemitripterus americanus).

    Main Methods:

    • A heat pulse was applied to the blood in the ventral aorta of Hemitripterus americanus.
    • Blood temperature was measured before and after passage through the gills to assess heat loss.
    • Metabolic heat loss was evaluated in sea water at 5°C.

    Main Results:

    • Fish gills were found to be highly effective heat exchangers, losing 80-90% of blood heat.
    • Direct heat transfer between afferent and efferent arteries within the gill structure accounts for the fraction of heat not lost.
    • The majority of metabolic heat (70-90%) is dissipated through the body wall and fins, with the remainder lost via the gills.

    Conclusions:

    • Fish gills are significant sites of heat loss, but not the primary route for metabolic heat dissipation in the sea raven.
    • The structural arrangement of gill vasculature facilitates some degree of heat conservation.
    • Body surface and fins are the predominant pathways for thermoregulation in this species under cold conditions.

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