A court rejected the company's appeal and upheld the sanction even though it was proven there was an error by the Health Condition Certifier and the laboratory.
Cases of infectious salmon anemia continue to multiply along the Norwegian coast, with authorities enforcing restriction zones to halt the spread of the disease.
The Norwegian Food Safety Authority has confirmed two new cases of the disease at salmon facilities owned by Måsøval and Lerøy, with many thousands of fish at risk.