Suspicion of ISA at Salmar’s Ytterflesa Site in Nærøysund.
Norwegian salmon farming company Salmar Oppdrett has raised concerns over a potential outbreak of infectious salmon anemia (ISA) at its Ytterflesa site, located in Nærøysund in the Trøndelag region. ISA is a viral disease that can impact salmon stocks and is of significant concern to the aquaculture industry.
Routine testing at the site, which is used for the production of farmed salmon, revealed potential signs of ISA. The results from samples taken on 27 May 2025 prompted Salmar Oppdrett to notify the Norwegian Food Safety Authority (Mattilsynet), the government body responsible for overseeing animal health and food safety in Norway.
In response, Mattilsynet has stated it will collect additional samples from the site and send them to the Veterinary Institute for confirmation of the diagnosis. The authority has also imposed restrictions on the site, including a ban on the movement of fish without special permission, in order to prevent the potential spread of the disease.
If the presence of ISA is confirmed, Mattilsynet may order the removal of fish from the site or specific areas within it, as part of its efforts to limit the impact of the disease on Norway’s salmon farming sector.