A total of 877 juvenile English sole (Parophrys vetulusGirard) from the Yaquina Bay estuary and742 juvenileandadultsole from the Pacific Ocean off Oregon were examined forparasites. Fifteen species of parasites were found in juvenile English sole on the estuarine nursery ground. Differences in the prevalence and intensity of parasite infection between size classes of juvenile sole and between sole occupying the upper and lower estuary were determined. An additional 14 parasite species were found in offshore English sole, bringing the total observed in all fish to 29 species. Parasites acquired only in the estuary included the microsporidanGlugea stephani, the acanthocephalanEchinorhynchus lageniformis, and the nematodePhilometra americana. Those acquired only in offshore areas included the trematodesOtodistomum veliporumandZoogonus dextrocirrus, the leechOceanobdellasp. and three species of copepods. An attempt to use parasite data to indicate the presence of distinct English sole stocks along the Oregon coast was inconclusive.
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