IPNウイルス接種量とニジマス稚魚のへい死率との関係

概要

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The influence of inoculative quantity of infectious pancreatic necrosis virus (IPNV) on mor-tality of rainbow trout fry Salmo gairdneri was studied. IPNV-Buhl strain which is the most dominant IPNV-strain in Japan was used for a challenge virus and a highly sensitive strain to IPNV (RT-101 strain, 0.13 g and 0.26g in the mean B. W.) was employed as an experimental fish in this study. The fry was immersed with 105.0, 104.0, 103.0, 102.0 and 101.0 TCID50/ml of IPNV at 15°C for 1h and incubated at 15°C for 28 days. As the results obtained, cumulative mortality in the fry weighing 0.13g was 92, 84, 80, 51 and 26% and in the fry weighing 0.26g was 61, 38, 26, 0 and 0%at 105.0, 104.0, 103.0, 102.0 and 101.0 TCID50/ml of IPNV, respectively. At 105.0 TCID50/mlof IPNV, the peak of daily mortality was on the 4-6th day after inoculation and the mortalitypattern was a typical acute type. The daily mortality became lower, the peak of the daily mortalitywas delayed and the death of fry continued until later, as tine inoculative quantity of IPNV wasreduced.
日本水産學會の論文