Infectious Pancreatic Necrosis Virus — Temperature and Age Factors in Mortality

Infectious pancreatic necrosis virus was present in brook trout in two Ontario salmonid hatcheries but did not appear to cause high mortality. Experiments and field observations showed that a number of factors were responsible for the low mortality, in particular, low water temperatures during the age of highest susceptibility of the fry and a lack of, or low level of transmission of virus during these periods of cold water temperatures.