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Science 25 October 1963:
Vol. 142. no. 3591, pp. 486 - 488
DOI: 10.1126/science.142.3591.486
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Articles

Thermoperiodism in Sea-run Cutthroat Trout ( Salmo clarki clarki)

Wallace G. Heath 1

1 Department of Biology, Western Washington State College, Bellingham

Thermal tolerances from square-wave cycled temperature acclimation were compared with those from constant acclimation temperatures. A response to the maximum temperature of the square-wave cycle occurred. The acclimation thermoperiod was varied from one-fourth to twice the 24-hour cycle, and a relative maximum of tolerance resulted for the 24-hour thermoperiod. This suggests physiological adaption to natural 24-hour thermoperiods.

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