Abstract
Five hybrids between Hybopsis plumbea and Rhinichthys cataractae seined from Upper Kananaskis Reservoir, Alberta, were intermediate in most of the characters examined which differ between their parental species. Hybrids of each sex were present. Environmental changes may have been conducive to the hybridization. Marked physical changes occur annually in Upper Kananaskis Reservoir and Hybopsis plumbea and probably Rhinichthys cataractae were introduced.

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