Abstract
The occurrence and levels of yellowtail ascites virus (YAV) and anti-YAV neutralizing antibody were examined in cultured yellowtail Seriola quinqueradiata sampled from one net-pen in Uranouchi-Bay, Kochi Prefecture where an outbreak of viral pancreatic-hepatic necrosis occurred. The sampling period was May 22 to December 2, 1986, the disease was prevalent during May 22 to June 18. The percentage of YAV positive samples in organs of the sampled fish increased after the outbreak of the disease showing 100% during and just after the period of highest mortality, then with decreasing disease prevalence. YAV was not further isolated after 2 weeks from the period of prevalent disease. The mean virus titer (TCID50/g or ml) was 106.6 in the liver, 106.5 in the pyloric caeca, 106.4 in the intestine, 105.7 in the gill, 105.4 in the stomach, 105.3 in the kidney and 106.7 in the ascites fluid. Neutralizing antibody was detected in 10.8% of the fish sampled after July 5. The titers (ND50) ranged from 1:22 to 1:3, 822. No relationship was noted between the level of neutralizing antibody titer and the sampling period or the body weight of the fish.
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