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Vitamin A increases cold tolerance in goldfish.

T S Chen, F J Buccini, D Chen

    International Journal for Vitamin and Nutrition Research. Internationale Zeitschrift Fur Vitamin- Und Ernahrungsforschung. Journal International De Vitaminologie Et De Nutrition
    |January 1, 1985
    PubMed
    Summary

    Vitamin A supplementation enhances goldfish cold tolerance. Injecting retinol palmitate increased survival time at 0°C and was linked to the emergence of liver antifreeze proteins, suggesting a survival advantage in cold conditions.

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    Area of Science:

    • Biochemistry
    • Animal Physiology
    • Environmental Adaptation

    Background:

    • Cold-adapted animals exhibit high liver stores of vitamin A.
    • This suggests a potential survival advantage conferred by vitamin A in cold environments.
    • Understanding the physiological mechanisms behind cold tolerance is crucial for animal survival.

    Purpose of the Study:

    • To investigate the hypothesis that high vitamin A stores enhance cold tolerance.
    • To determine if vitamin A supplementation can increase survival rates in cold conditions.
    • To explore the association between vitamin A and the development of cold-adaptive proteins.

    Main Methods:

    • Goldfish were injected with retinol palmitate (a form of vitamin A).
    • Control groups received no injection.

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  • Survival rates and temperature tolerance were measured at near-freezing temperatures (0°C).
  • Hepatic (liver) tissues were analyzed for the presence of specific proteins.

    • Main Results:

    • Injected goldfish tolerated temperatures 4.6°C lower than controls.
    • Survival time at 0°C significantly increased in supplemented goldfish (43 min vs. 28 min for controls).
    • Antifreeze proteins were detected in the livers of vitamin A-injected fish.

    Conclusions:

    • Vitamin A supplementation, via retinol palmitate, enhances goldfish survival and tolerance to cold stress.
    • The observed cold resistance is associated with the induction of hepatic antifreeze proteins.
    • This finding supports the role of vitamin A in conferring a survival advantage against cold exposure.