Resistance to reinfection in chinook salmon Oncorhynchus tshawytscha to Loma salmonae (Microsporidia)

Chinook salmon Oncorhynchus tshawytscha were experimentally infected per os with Loma salmonae and held in flow-through seawater tanks at 12 to 14 degrees C. The fish exhibited 100% infection when first examined at 7 wk post initial exposure (p.e.), and by 20 wk p.e. they had completely recovered fr...

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Bibliographic Details
Published in:Diseases of aquatic organisms 1999-09, Vol.37 (3), p.205-208
Main Authors: KENT, M. L, DAWE, S. C, SPEARE, D. J
Format: Article
Language:English
Subjects:
Animal aquaculture
Animal productions
Animals
Antibodies, Monoclonal
Biological and medical sciences
Fish Diseases - epidemiology
Fish Diseases - immunology
Fish Diseases - parasitology
Fisheries
Fundamental and applied biological sciences. Psychology
Gills - parasitology
Gills - pathology
Immunohistochemistry
Kidney - parasitology
Kidney - pathology
Loma salmonae
Marine
Microsporida - immunology
Microsporidiosis - epidemiology
Microsporidiosis - immunology
Microsporidiosis - parasitology
Microsporidiosis - veterinary
Oncorhynchus tshawytscha
Pisciculture
Prevalence
Salmon - parasitology
Seawater
Vertebrate aquaculture
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Summary:Chinook salmon Oncorhynchus tshawytscha were experimentally infected per os with Loma salmonae and held in flow-through seawater tanks at 12 to 14 degrees C. The fish exhibited 100% infection when first examined at 7 wk post initial exposure (p.e.), and by 20 wk p.e. they had completely recovered from gill infections. The recovered fish were then re-exposed the following week. All of these fish showed strong protection to new L. salmonae infections, while naïve fish exposed to the same inoculum developed the infection. Most of the re-exposed fish exhibited a few free spores or spores within phagocytes in the kidney interstitium at 20 to 29 wk p.e., but xenomas were not detected in either the gills or visceral organs. The kidney is the primary site of reticulo-endothelial activity, and thus these spores were likely deposited in the kidney by entrapment by fixed macrophages. It is possible that these spores provide immunologic stimuli to reinforce the resistance to new L. salmonae infections.
ISSN:0177-5103
1616-1580
DOI:10.3354/dao037205