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Diseases of Aquatic Organisms

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DAO 45:103-107 (2001)  -  doi:10.3354/dao045103

Persistence of herpesvirus of eel Herpesvirus anguillae in farmed European eel Anguilla anguilla

A. P. van Nieuwstadt*, S. G. Dijkstra, O. L. M. Haenen

Fish Diseases Laboratory, ID-Lelystad Institute for Animal Science and Health, PO Box 65, 8200 AB Lelystad, The Netherlands

ABSTRACT: Herpesvirus of eel Herpesvirus anguillae (HVA) was isolated repeatedly from farmed eel of an outwardly healthy stock, but virus isolation was much greater in an experimental group of fish that were injected with dexamethasone. The results suggest that HVA can establish a latent infection in eel. Previous exposure of these eels to HVA virus was shown by detection of HVA-specific antibodies. These eels did not show clinical signs after a secondary infection with HVA. Tracing of seropositive eel stocks, which had previous contact with HVA, and of HVA carrier fish can be useful to control disease outbreaks due to HVA infection.

KEY WORDS: Herpesvirus · Eel · Latency · Dexamethasone

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