Published 2004

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Publication details

Journal : Diseases of Aquatic Organisms , vol. 57 , p. 35–41–7 , 2004

International Standard Numbers :
Printed : 0177-5103
Electronic : 1616-1580

Publication type : Academic article

Contributors : Johansen, Renate; Amundsen, M; Dannevig, BH; Sommer, AI

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Kjetil Aune
Chief Librarian


Spotted wolffish Anarhichas minor (approx. 0.7 g) were found to be susceptible to infection with a nodavirus isolated from Atlantic halibut (AHNV) by bath-challenge. During the acute stage of infection, 4 to 8 wk post-challenge, viral encephalopathy and retinopathy (VER) were diagnosed by histopathology, immunohistochemistry (IHC) and reverse transcriptase-polymerase chain reaction (RT-PCR). Accumulated mortality was 52% in the challenged group. The surviving fish were sampled 16 wk post-challenge, by which time they had grown to approximately 17 g. No clinical signs of VER were observed in these fish. RT-PCR examination revealed the presence of nodavirus in several organs of the survivors, but no immunopositive cells were detected by IHC. Nodavirus was reisolated from fish at the last sampling in SSN-1 cells, showing that nodavirus retains virulence in persistently infected wolffish for at least 16 wk post-bath-challenge.