The main objective of this investigation was to examine the ultrastructural features of gills from rainbow trout experimentally infected with Loma salmonae to determine the morphological events that occur during the late stages of development of this parasite. Peripheral distribution of the mature parasites inside round xenomas was observed at weeks 5 and 6 postexposure (PE), but eventually the parasite occupied the entire xenoma. Degenerative changes were observed only in immature parasites at week 7 PE, and eventually an inflammatory reaction with a cellular infiltration was directed against mature spores. Round, flattened, and irregular shaped xenomas were observed at week 8 PE. The round xenomas showed a severe inflammatory response with disintegration of the xenoma membrane. This event was accompanied by eversion of polar tubes within the attacked xenoma and by the simultaneous presence of 2 tubular appendages, the type I and II tubules. Flattened xenomas were observed below the endothelium of gill lamella arteries. The irregular xenomas were located in the connective tissue of the gill filament and showed multiple projections occupied by spores. Both flattened and irregular xenomas showed no evidence of inflammatory reaction. An earlier proposed hypothesis is expanded to explain how L. salmonae is implanted beneath lamellar endothelium and within filament connective tissue.
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June 2003
Research Article|
June 01 2003
ULTRASTRUCTURAL STUDY OF THE LATE STAGES OF LOMA SALMONAE DEVELOPMENT IN THE GILLS OF EXPERIMENTALLY INFECTED RAINBOW TROUT
L. E. Rodríguez-Tovar;
L. E. Rodríguez-Tovar
Department of Pathology and Microbiology, Atlantic Veterinary College, UPEI, 550 University Avenue, Charlottetown, PEI, C1A 4P3, Canada. speare@upei.ca
* Present address: Facultad de Medicina Veterinaria y Zootecna, UNAL, Ave. Lázaro Cárdenas, 4600 Unidad Mederos, Monterrey, N.L., México CP 64930
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G. M. Wright;
G. M. Wright
Department of Pathology and Microbiology, Atlantic Veterinary College, UPEI, 550 University Avenue, Charlottetown, PEI, C1A 4P3, Canada. speare@upei.ca
† Department of Biomedical Sciences, Atlantic Veterinary College, UPEI, 550 University Avenue, Charlottetown, PEI, C1A 4P3, Canada
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D. W. Wadowska;
D. W. Wadowska
Department of Pathology and Microbiology, Atlantic Veterinary College, UPEI, 550 University Avenue, Charlottetown, PEI, C1A 4P3, Canada. speare@upei.ca
‡ Electron Microscopy Laboratory, Atlantic Veterinary College, UPEI, 550 University Avenue, Charlottetown, PEI, C1A 4P3, Canada
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D. J. Speare;
D. J. Speare
Department of Pathology and Microbiology, Atlantic Veterinary College, UPEI, 550 University Avenue, Charlottetown, PEI, C1A 4P3, Canada. speare@upei.ca
§ To whom correspondence should be addressed
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R. J F. Markham
R. J F. Markham
Department of Pathology and Microbiology, Atlantic Veterinary College, UPEI, 550 University Avenue, Charlottetown, PEI, C1A 4P3, Canada. speare@upei.ca
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J Parasitol (2003) 89 (3): 464–474.
Citation
L. E. Rodríguez-Tovar, G. M. Wright, D. W. Wadowska, D. J. Speare, R. J F. Markham; ULTRASTRUCTURAL STUDY OF THE LATE STAGES OF LOMA SALMONAE DEVELOPMENT IN THE GILLS OF EXPERIMENTALLY INFECTED RAINBOW TROUT. J Parasitol 1 June 2003; 89 (3): 464–474. doi: https://doi.org/10.1645/0022-3395(2003)089[0464:USOTLS]2.0.CO;2
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