Suspected case of Infectious Salmon Anaemia (ISA) at Cermaq Norway site in Finnmark.
Norwegian authorities have placed restrictions on a Cermaq Norway Salmon AS facility in Alta, Finnmark, following a suspected outbreak of infectious salmon anaemia (ISA) at seawater site 24535 Storholmen.
The Norwegian Food Safety Authority (Mattilsynet) was notified by Cermaq on 24 February after preliminary tests indicated the presence of the virus. The suspicion is based on positive PCR test results from fish sampled at the site.
Inspection and containment measures
Mattilsynet plans to conduct an on-site inspection in the coming days to collect additional samples, which will be analysed by the Norwegian Veterinary Institute for confirmation of ISA.
To prevent potential disease spread, the site is now subject to movement restrictions, including a ban on transferring fish without special approval. If the suspicion is confirmed, authorities may order a full or partial cull of the affected fish stock.
Potential establishment of a restriction zone
Should the case be verified, Mattilsynet is expected to establish a restriction zone around the site to limit disease transmission. This zone would consist of:
- A protection zone, surrounding the affected facility.
- A surveillance zone, covering a wider area to monitor potential spread.
The restriction zone could extend 10 to 20 km, depending on local environmental factors such as currents and the proximity of other aquaculture sites.
Industry advised to exercise caution
Authorities have urged all aquaculture operators and vessels in the area to adhere to strict biosecurity measures to minimise the risk of further transmission.
ISA is a notifiable disease in Norway and, while not harmful to humans, poses a significant risk to farmed salmon populations.
Mattilsynet will provide further updates as the situation develops.
