Abstract
Brook trout, Salvelinus fontinalis, from hatching up to 31 weeks of age, were tested for susceptibility to IPNV at experimental temperatures of 5, 10 and 15°C. There were two different intervals of physiological age demonstrating specific characteristics of sensitivity to IPN viral infection in these fish. From 6 to 12 weeks of age, the peak mortality manifested itself around 21 days postinfection. In fish 15–21 weeks of age, mortality peaked as early as 10 days post-infection. Before or after these age intervals the fish did not appear to be sensitive to the virus. Moreover, the disease was produced at 10 and 15°C but fingerlings appeared resistant at 5°C.
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