Abstract
Abstract Experiments in each of three successive years were designed to observe the effect of temperature upon chinook salmon, Oncorhynchus tshawytsch (Walbaum), during the period from the egg to the fingerling stage. Experimental temperatures ranged from 34° F. to 74° F. but there were no survivals to the stage where vertebrae or fin rays could be counted for lots reared at temperatures below 39° F. or above 62° F. For these experiments the average number of vertebrae per lot was less for lots reared at temperatures in the middle portion of the 39° F. to 62° F. range than for lots reared at either extreme of the range. The same effect was observed in regard to the number of individuals with abnormal vertebrae, but the opposite effect was observed in regard to the numbers of rays in the anal and dorsal fins. The average numbers of vertebrae in the lots from the Sacramento River (California) and the three Washington rivers—Skagit, Green and Entiat—and reared at the same temperature (56° F.) were respective...
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