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Science 28 June 1963:
Vol. 140. no. 3574, p. 1396
DOI: 10.1126/science.140.3574.1396
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Articles

Electrocardiographic Studies of Free-Swimming Sharks

Perry W. Gilbert 1 and Steven D. Douglas 2

1 Department of Zoology, Cornell University, Ithaca, New York
2 Cornell University Medical College, New York 21, New York

Electrocardiograms were taken of young lemon sharks, Negaprion brevirostris, as they swam freely in a circular concrete pool. Electrodes attached to the fin and torso yielded negligible or minute deflections, but direct leads yielded satisfactory recordings.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)