Effectiveness of increasing temperature of rearing water and non-feeding against viral endothelial cell necrosis of eel
2008
Tanaka, M.(Shizuoka-ken. Research Inst. of Fishery, Hamamatsu (Japan). Hamanako Branch) | Satoh, T. | Ma, W.J. | Ono, S.
Viral endothelial cell necrosis of eel (VECNE) of Japanese eel Anguilla japonica, caused by an adenovirus (JEAdV), has been a serious problem of aquaculture industry in Japan. In the present study, effectiveness of increasing water temperature and non-feeding against VECNE was evaluated. Cumulative mortalities of fish intraperitoneally injected with 10E5.05 TCIDsub(50)/fish of JEAdV increased with elevating water temperature in the range between 20degC and 31degC, but mortality at 35degC was as low as that at 20degC. Rearing infected fish under the non-feeding condition further enhanced the effect of treatment at 35degC. The effectiveness was dependent on rearing periods at the high temperature; more than 3 days at 35degC were needed to reduce mortality. Fish, which survived the primary challenge with JEAdV at 35degC, showed high resistance to re-challenge with JEAdV. From these results, the treatment of fish under the non-feeding condition at 35degC is useful to control VECNE.
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