Abstract
THE belief that fishes are cold-blooded, that is, that they take on the temperature of the water which surrounds them, with no power to resist it, and that they develop little or no animal heat themselves, is still held by many even scientific observers, This belief is based partly upon the well authenticated fact that fishes have been frozen and thawed again into life; partly upon the statements of many travellers who have found them living in water of a very high temperature (Humboldt and Bonpland recording the highest, 210° F.); and further, that a thermometer inserted into the rectum of some living fish freshly drawn from the water has been repeatedly found to indicate temperature corresponding very closely to that of the water itself.
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The Animal Heat of Fishes . Nature 21, 156 (1879). https://doi.org/10.1038/021156a0
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DOI: https://doi.org/10.1038/021156a0