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Journal of Wildlife Diseases, 43(1), 2007, pp. 111-115
© Wildlife Disease Association  2007
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SHORT COMMUNICATION

Gross and Microscopic Pathology Associated with Large Cavernous Lesions in Muscle of Chinook Salmon from Lake Ontario

 Emily K. Meseck1, Tracy W. French2, Stephanie G. Grimmett3, Susan L. Bartlett3, Gregory A. Wooster3, Rodman G. Getchell3, John H. Schachte, Jr.4 and Paul R. Bowser3,5

1 Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA
2 Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA
3 Aquatic Animal Health Program, Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA
4 Fish Disease Control Unit, New York State Department of Environmental Conservation, 8314 Fish Hatchery Road, Rome, New York 13440, USA
5 Corresponding author (email: prb4{at}cornell.edu)

ABSTRACT:   Since 1999, eight adult Chinook salmon (Onchorhynchus tshawytscha) from Lake Ontario with large, focal, cavernous, fluid-filled muscle lesions have been examined in our respective laboratories. Gross and microscopic examination, cytology, and bacteriology were performed. Microscopically the lesions were consistent with chronic abscesses. Cytologic evaluation revealed diplomonad flagellate Spironucleus within these lesions. We provide a description of the gross and microscopic pathology associated with the cavernous lesions.
  Key words:  Abscess, Chinook salmon, pathology, Onchorhynchus tshawytsch, Spironucleus.






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