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Related Experiment Videos

Cardiac arrest in the spawning chum salmon.

K Uematsu, H Uesugi, S Murachi

    Comparative Biochemistry and Physiology. A, Comparative Physiology
    |January 1, 1983
    PubMed
    Summary

    During spawning, chum salmon experience temporary cardiac arrest. This heart beat cessation, lasting seconds, may be a reflex to high blood pressure during this reproductive event.

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    Area of Science:

    • Ichthyology
    • Cardiovascular Physiology
    • Reproductive Biology

    Background:

    • Spawning is a critical and energetically demanding period for fish.
    • Understanding physiological responses during spawning is key to assessing fish health and reproductive success.

    Purpose of the Study:

    • To investigate the cardiac activity patterns of chum salmon during spawning.
    • To determine the occurrence and duration of cardiac events, such as heart beat cessation, in both male and female salmon.

    Main Methods:

    • Simultaneous recording of cardiac activity using radio telemetry and a wired system.
    • Monitoring heart rate and identifying periods of cardiac arrest in male and female chum salmon during spawning bouts.

    Main Results:

    • A temporary cessation of heart beat was observed in both sexes during spawning bouts.
    • Females experienced cardiac arrest for approximately 10 seconds, while males experienced it for 4-6 seconds.
    • Heart rate increased from a baseline of about 50 beats per minute to about 60 beats per minute immediately before and after cardiac arrest.

    Conclusions:

    • The observed cardiac arrest during spawning is likely a reflex response.
    • Hypertension (high blood pressure) associated with spawning may trigger this cardiovascular reflex.
    • This finding provides insight into the physiological challenges faced by salmon during reproduction.

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