Abstract
Abstract We assessed the influence of developmental stage on the survival and growth of embryos of cutthroat trout (Oncorhynchus clarki) fertilized at 7°C and subsequently cooled to 5 or 3°C. Cooling from 7°C took place after 2 h of water hardening, as well as 15, 25, and 35 d after fertilization. Mean survival to hatching was lowest (35%) among embryos cooled to 3°C immediately following water hardening, but it was highest (94%) among embryos cooled to 3°C following incubation at 7°C for 15 d. Mean survival among embryos maintained at 7°C throughout incubation was 79%. Cooling the embryos to 3°C after 15 d at 7°C prolonged the time to hatching by 1 month and enhanced survival to hatching by 15% over embryos maintained at 7°C.
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