Abstract
Five pairs of paternal half-sib families were obtained from each of six stocks of chinook salmon ( Oncorhynchus tshawytscha) in British Columbia. Life history patterns and size and age at maturity varied among the parental fish used from each stock. The freshwater survival and growth of progeny were monitored under controlled hatchery conditions. Survival of uneyed eggs, alevins, fry, smolts, and cumulative survival to 125–140 days after ponding differed among stocks and among families within stocks. The overall heritabilities (sire component) of survival at all four developmental stages were less than 0.05. Alevin weight, smolt weight, and growth rate differed among stocks and among families within stocks. The heritability (sire component) of smolt weight ranged from 0.0±0.59 to 0.88±0.72 among stocks, with an overall value of 0.0. The success of selection for smolt weight might be stock-dependent.
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