In late August 2013 the Norwegian Veterinary Institute (NVI) received the first case of diseased rainbow trout from a hatchery. The signs of disease were unusual for fish at this age. The second and third cases were submitted to the NVI during October and primo November. The most recent hatchery affected by this disease was recorded in January 2014. Diseased fish were sized from 30 – 100 g. One hatchery reported high mortality in some pens. The other affected sites reported moderate mortalities.
Via John Bostock