title: Innate susceptibility differences in chinook salmon Oncorhynchus tshawytscha to Loma salmonae (Microsporidia).
abstract: Loma salmonae (Putz, Hoffman and Dunbar, 1965) Morrison & Sprague, 1981 (Microsporidia) is an important gill pathogen of Pacific salmon Oncorhynchus spp. in the Pacific Northwest. Three strains of chinook salmon O. tshawytscha were infected in 2 trials with L. salmonae by feeding of macerated infected gill tissue or per os as a gill tissue slurry. Intensity of infection was significantly higher in the Northern stream (NS) strain as compared to the Southern coastal (SC) and a hybrid (H) strain derived from these 2 strains. Both wet mount and histological enumeration of intensity of infection demonstrated strain differences. Survival in the NS strain was significantly lower than the other strains. The NS strain may represent a naive strain and be less able to mount an effective immune response against the parasite.
authors: shawr@admin.gmcc.ab.ca
authors: R W
authors: RW
authors: Shaw
authors: M L
authors: ML
authors: Kent
authors: M L
authors: ML
authors: Adamson
mesh_terms: D000818:Animals; D017756:Aquaculture; D004198:Disease Susceptibility / Q000662:veterinary; D005393:Fish Diseases / Q000276:immunology* / Q000469:parasitology / Q000473:pathology; D005880:Gills / Q000469:parasitology / Q000473:pathology; D006651:Histocytochemistry; D016814:Microsporidia / Q000472:pathogenicity*; D016881:Microsporidiosis / Q000276:immunology / Q000473:pathology / Q000662:veterinary*; D015205:Northwestern United States; D015995:Prevalence; D012474:Salmon / Q000469:parasitology*