Abstract:
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.
