No fish at Craig Brook NFH has ever demonstrated symptoms of the disease in the seven years wild stock have been held at that hatchery. However, the virus has demonstrated that it can cause lethal disease in salmon under the conditions existing in the Massachusetts hatchery. A togavirus isolated in tissue culture has been detected in Atlantic salmon from farms in Maine and New Brunswick. The virus appears to be in New Brunswick and has been found in the Cobscook Bay area of eastern Maine. There has been no disease found associated with this virus at present, but it is monitored as part of the routine health inspection process for aquaculture operations in Maine.
Most salmon encounters fungi during their various life stages.
Saprolegnia is the only fungal disease of Atlantic salmon, and is primarily found in adult males.