A disease resembling thiamine-responsive polioencephalomalacia of domestic ruminants is described in four wild pronghorn from Saskatchewan. One animal was found dead, two were recumbent and unable to rise and the fourth was staggering and ataxic. Lesions were confined to the brain and consisted of b...

Over a period of 9 yr, seven white-fronted geese (Anser albifrons) and one Canada goose (Branta canadensis) with multiple intramuscular mesenchymal tumors were encountered in Saskatchewan (Canada) and one similarly affected Canada goose was seen on Prince Edward Island (Canada). The tumors in these ...

Two groups of rainbow trout fingerlings were exposed for 90 days to 0.2 and 0.4 mg/l of un-ionized ammonia, respectively. Several fish exposed to the higher concentration soon developed clinical signs suggestive of a neurological dysfunction but subsequently recovered. No lesion attributable to ammo...

Between 1977 and 1981, the Fish Pathology Laboratory of the Ontario Veterinary College received 239 cases from trout farms of southern Ontario, 51 (21.3%) of which had diseased gills. Branchial lesions in 86.3% of these 51 cases were characterized by marked lamellar epithelial hyperplasia with epith...