Microsporidian parasites in the gills of salmonid fishes*

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Abstract
A microsporidian parasite was found in the gills of the brook trout, Salvelinus fontinalis (Mitchill), which was similar to Loma morhua Morrison and Sprague, a microsporidian parasite in the gills of cod. It was described and designated as Loma sp. Plistophora (=Pleistophora) salmonae Putz, Hoffman and Dunbar in gills of rainbow and steelhead trout, Salmo gairdneri Richardson, was also observed and was transferred to the genus Loma. All microsporidia known in gills of Gadidae and Salmonidae were judged to belong to the genus Loma but the data were not sufficient to provide a basis for a definitive separation of species. Provisionally, Loma morhua, L. branchialis, L. salmonae and Loma sp. were recognized.