Infectious IHN virus in Finland


Infectious haematopoietic necrosis (IHN) was diagnosed in Finland for the first time on November 30th 2017. The virus was found in rainbow trout in a marine farm located in the municipality of Ii in Northern Ostrobothnia. Investigations to determine the prevalence of the disease revealed the virus also in a neighboring rainbow trout farm run by another operator. Both facilities are winter storages for marine net cages. Finnish Food Safety Authority Evira has set up a containment area around these infected farms located in Ii.

When inspecting the farms that had had a contact with the farms is Ii, the IHN virus was found in an inland broodstock farm in the municipality of Tervo, in the River Kymijoki water catchment area. This farm is one of the largest facilities producing juveniles in Finland.  Evira has set up a second containment area around this farm. The area covers parts of River Kymijoki basin.

Furthermore, IHN was also detected in a fishing pond close to the broodstock farm, in a small backyard pond in River Vuoksi water catchment area and in a fishing pond in also located in River Vuoksi catchment area (19th of January 2018). Evira has set up containment areas around the infected ponds.

Altogether, IHN has been detected in six locations. No new cases are found since January 2018. All the fish in the infected farms/ponds have been destroyed and facilities are being cleaned, disinfected and fallowed according to EU legislation. The origin of the infection is still unclear.

All the aquaculture facilities that have had a contact with the IHN-positive farms have been inspected and sampled by municipal veterinarians. The surveillance is continuing. Surveillance programs will be started in the four containment areas aiming in regaining the IHN-free status according to EU legislation. Other areas of Finland are free of IHN. If new information is obtained, the website will be updated.


Map of the IHN containment areas in Finland


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