| Summary: | Summary • Twenty-six species of parasites were recovered from nine species of fish hosts. • To date none ofthe fish parasites identified as potential pathogens to Lake Winnipeg fish by Williamson et al (2005) have been found in the Red River delta fish samples. • Two new parasites species know to be pathogenic in fish were discovered in the samples i e. Bothriocephalus acheilognathi and Sanginicola occidentalis. • The time of invasion by these two parasite species into The Hudson Bay drainage is unknown • Bothriocephalus acheilognathi was widely distributed being present in six species of fish and found in the south and north basins of Lake Winnipeg. • Bothriocephalus acheilognathi most frequently infected (prevalence of 74%) the cyprinid fish host, Notropis atherinoides (Emerald shiner). • Bothriocephalus acheilognathi was found exclusively in young of the year emerald shiners. • Bothriocephalus acheilognathi was recovered from the intestine of older and and larger pike (Esox lucius), walleye (Sander vitreum), sauger (!>ander canadensis) white bass (Merone chrysops), goldeye (Hiodon alosoides). • The Myxozoan occurred on the gills of emerald shiner, occasionally causing severe pathology.
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