Gang Li has been fined $20,000 for trying to import seven vials of poultry diseases.
He was caught by Canadian Border Services Agency officials at Pearson International Airport.
They found the vials contained Peste des Petits Ruminants Virus, Newcastle Disease Virus, Duck Adenovirus 1, and Parainfluenza Virus 5.
Li had no permits to import the vials, the court in Brampton was told.
"All of these viruses may pose serious disease threats to animals,” said the Canadian Food Inspection Agency.