1. Aquaculture Centre, Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
2. Canadian Cooperative Wildlife Health Centre, Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
3. Bureau of Microbial Hazards, Food Directorate, Health Products and Food Branch, Health Canada, Tunney's Pasture, Ottawa, Ontario K1A 0L2, Canada