The adaptive significance of certain enzyme polymorphisms in steelhead trout (Salmo gairdneri) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8623j1300

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  • Mean weights, lengths, and condition factors of three isozyme phenotypes of lactate dehydrogenase (LDH) enzyme differed significantly for experimentally reared winter steelhead trout (Salmo gairdneri) fry. Time of emergence from the gravel was unrelated to LDH phenotype. Relative mortality of the phenotypes between eyed-egg stage and emergence was unaffected by different sub-gravel conditions of temperature and dissolved oxygen. Differential tolerance to acute challenges of high temperature and low dissolved oxygen was observed between phenotypes of isocitrate dehydrogenase (IDH) enzyme and LDH in juvenile trout. Parental effects may have biased the results for LDH. Differences between IDH phenotypes may be related to intrinsic properties of variant isozymes.
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