OBSERVATIONS ON THE DISTRIBUTION OF PARASITES OF CERTAIN CATOSTOMID FISHES OF THE BOW RIVER, ALBERTA

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Abstract
A survey of the helminth parasites of Catostomus commersoni (Lacépède), C. catostomus (Forster), and Pantosteus platyrhynchus (Cope) of the Bow River, Alberta, was carried out in 1965. The results obtained suggest that effluents discharged into the river at Calgary affect the distributional patterns of Octospinifer macilentus Van Cleave, 1919 and of Neoechinorhynchus cristatus Lynch, 1936 by exclusion of their intermediate hosts in the immediate vicinity of the city. From the present data, however, we cannot completely eliminate the possibility that the size factor of fishes in the respective samples is not responsible for differences noted in the degree of parasitism in hosts from various localities along the course of the river.

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