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.
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1 October 1971
INFECTIOUS PANCREATIC NECROSIS VIRUS — TEMPERATURE AND AGE FACTORS IN MORTALITY
C. FRANTSI,
M. SAVAN