Abstract
IHN Virus titers in the fish bodies, rearing water and feces of artificially infected rainbow trout fry were investigated day after day. The fish were infected with immersion method by IHN virus Nagano isolate at the titer of 105.1 TCID50/ml for one hour. The fish began to die on 5 day post inoculation (PI) and final mortality was 97%. Virus was detected in fish body at first on one day PI and in every fish sampled after 3 day PI. High virus titers were maintained in fish after 4 day PI. Virus in rearing water was detected between 2 and 9 day PI and the highest titer (average) was recorded on 4 day PI at 103.8 TCID50/ml. Virus in feces was detected only in samples of 4 day PI but its titer were not high, therefore it was suggested that virus in feces did not affect strongly to virus titer in rearing water.
