Abstract
Growth, development and survival of chinook salmon (Oncorhynchus tshawytscha) during the yolk absorption period (fertilization to complete yolk absorption) were examined at 6, 8, 10, and 12 °C. Higher rearing temperatures reduced both the duration of the yolk absorption period and the overall amount of energy available for tissue growth during that period. Salmon encountered a metabolic energy deficit before yolk reserves were exhausted; tissues were resorbed during absorption of the last 10 mg (dry weight) of yolk. Salmon held above 10 °C experienced reduced survival, hatched and emerged precociously, and were smaller at hatching, at emergence, at maximum tissue weight and at complete yolk absorption than fish at lower temperatures.Key words: temperature, yolk utilization, Oncorhynchus tshawytscha, fish eggs, alevins
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