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Some aspects of growth in the Family Salmonidae Parker, Robert Ray

Abstract

Mathematical descriptions of the growth of animals are reviewed in the light of applicability to two species of the Family Salmonidae. No generalized growth equation is found to accurately depict growth for the material discussed. Theoretical and practical limitations of the use of age as a classification for relating growth rates are given. An hypothesis that relative growth rate declines with increase in size but is independent of age is offered and explored. Data on steelhead from Chilliwack River, British Columbia, are analysed with the use of size-specific instantaneous growth rate regressions. Factors leading to observed variation and life history events are discussed and the literature reviewed. In all cases, size is determined to be a more reliable criterion of physiological development than age.

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