Infectious IHN virus of salmon fish in Finland

The contagious viral disease of fish, infectious haematopoietic necrosis IHN was diagnosed in Finland for the first time on 30 November 2017. The IHN virus was found in rainbow trout in a marine fish farm located in the municipality of Ii in Northern Ostrobothnia. In studies conducted to determine the prevalence of the disease, the IHN virus was also found in a neighbouring farm run by another operator. Both facilities are winter storages for marine net cages. Finnish Food Safety Authority Evira has set up a restricted zone round these infected farms located in Ii.

When examining farms that had had contact with the Ii facilities, the IHN virus was on 11 December 2017 identified in an inland broodstock and nursery facility in the municipality of Tervo, in the River Kymi basin. This farm is one of the largest facilities producing juveniles in Finland. IHN was also detected in a fishing pond close to the farm. Evira has set up a second restricted zone which covers parts of River Kymi basin.

The fifth case of IHN was diagnosed in a small backyard pond in River Vuoksi basin on 5 January 2018. The sixth case was detected in a fishing pond in northern parts of River Vuoksi basin on 19th January. Fish had been moved to both ponds from the large broodstock and nursery facility during summer 2017. Evira has set up restriction zones around both the infected ponds.

Aquaculture facilities that have had contact with the farms where the IHN virus was found are being identified. The contact facilities will be inspected and sampled by municipal veterinarians. As new information is obtained, the website will be updated.