Innate susceptibility differences in Chinook salmon Oncorhynchus tshawytscha to Loma salmonae (Microsporidia)

Shaw, Ross W.; Kent, Michael L.; Adamson, M. L.

Innate susceptibility differences in Chinook salmon Oncorhynchus tshawytscha to Loma salmonae (Microsporidia)

Author

Shaw, Ross W.

Kent, Michael L.

Adamson, M. L.

Date

2000

Keywords

Loma salmonae, Microsporidia, innate susceptibility

Abstract (summary)

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.

Publication Information

Shaw, R.W., Kent, M.L.,and Adamson, M.L. (2000). Innate susceptibility differences in Chinook salmon Oncorhynchus tshawytscha to Loma salmonae (Microsporidia). Diseases of Aquatic Organisms. 43(1):49-53.