Abstract
IF a body is moving through water at a constant speed, the body must be constantly supplied with energy. In the case of a fish, the requisite energy is supplied by the muscles and is applied in such a way as to exert a backward thrust on the water, which compensates the resistance exerted by the water on the body of the moving fish.
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GRAY, J. Muscular Movements of Fishes*. Nature 131, 825–828 (1933). https://doi.org/10.1038/131825a0
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DOI: https://doi.org/10.1038/131825a0
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