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Diseases of Aquatic Organisms

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DAO 77:169-173 (2007)  -  DOI:

Nodavirus in farmed Atlantic cod Gadus morhua in Norway

Sonal Patel1, Kjetil Korsnes1,2,*, Øivind Bergh1,3, Frode Vik-Mo4, Jan Pedersen1, Audun Helge Nerland1

1Institute of Marine Research, PO Box 1870 Nordnes, 5817 Bergen, Norway
2Bodø University College, 8049 Bodø, Norway
3University of Bergen, Dept of Biology, PO Box 7800, 5020 Bergen, Norway
4Bergen Fish Health Service, Bredalsmarken 15, 5006 Bergen, Norway

ABSTRACT: Viral encephalopathy and retinopathy (VER) was diagnosed in 5 to 24 g sized farmed Atlantic cod Gadus morhua kept in sea cages at Parisvatn, Hordaland county, on the west coast of Norway. Moderate mortality (10 to 15%) was observed, along with anorexia and abnormal swimming behaviour, such as looping or spiral swimming and reduced coordination. Nodavirus was detected by 2 different real-time RT-PCR assays, and this was later confirmed by immunohistochemistry. This is the first report of an outbreak of VER in farmed cod in Norway, and the first report that VER affect cod exceeding 5 g in size.

KEY WORDS: Nodavirus · Norway · Viral encephalopathy and reitinopathy · VER · Viral nervous necrosis · VNN · Atlantic cod · Gadus morhua

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Cite this article as: Patel S, Korsnes K, Bergh Ø, Vik-Mo F, Pedersen J, Nerland AH (2007) Nodavirus in farmed Atlantic cod Gadus morhua in Norway. Dis Aquat Org 77:169-173.

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