SalMar has notified the Norwegian Food Safety Authority that it has findings consistent with infectious salmon anemia (ISA) in fish at its farming location in Mjøsund Vest.
The Norwegian Food Safety Authority said SalMar informed it of the discovery on 28 July. The suspected case came from a positive result after sampling fish at the Mjøsund Vest site.
Following the discovery, the Norwegian Food Safety Authority said it will begin conducting sampling for possible verification and to confirm the diagnosis. If the follow-up test verifies a positive ISA case, the authority will place restrictions on moving fish from the location without special permission.
“In cases where ISA suspicion is confirmed, a restriction zone is established to prevent, contain, and combat ISA,” the Norwegian Food Safety Authority said. “A restriction zone consists of a protection zone and a surveillance zone and will entail restrictions on traffic in the area surrounding the site, among other things.”
ISA has at times plagued Norwegian salmon producers, and each time it is discovered the Norwegian Food Safety Authority quickly establishes restriction zones to prevent its spread.
SalMar also reported ISA at a location in the Nærøysund municipality in May 2026, which was confirmed by the Norwegian Food Safety Authority. That detection resulted in movement restrictions.
