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Diseases of Aquatic Organisms

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DAO 58:99-110 (2004)  -  doi:10.3354/dao058099

Experimental infection of rainbow trout Oncorhynchus mykiss with viral haemorrhagic septicaemia virus isolates from European marine and farmed fishes

Helle Frank Skall1,*, Wilhelmina J. Slierendrecht1,3, Julie A. King2, Niels Jørgen Olesen1

1Danish Institute for Food and Veterinary Research, Department of Poultry, Fish and Fur Animals, Hangøvej 2, 8200 Århus N, Denmark
2FRS Marine Laboratory, PO Box 101, Victoria Road, Aberdeen AB11 9DB, UK
3Present address: BioMar A/S, Mylius Erichsensvej 35, 7330 Brande, Denmark

ABSTRACT: The susceptibility of rainbow trout Oncorhynchus mykiss to infection with various isolates of viral haemorrhagic septicaemia virus (VHSV) was examined. A total of 8 experiments with rainbow trout ranging from 0.6 to 6.2 g was conducted for 139 isolates originating from wild marine fishes in European waters (115 isolates), farmed turbot from Scotland and Ireland (2 isolates), and farmed rainbow trout (22 isolates). The isolates were tested by immersion and/or intraperitoneal injection either as pooled or single isolates. The isolates from wild marine fishes did not cause mortality by immersion while some of the isolates caused mortality when injected. All VHSV isolates from farmed rainbow trout caused significant mortality by immersion. Currently, pathogenicity trials are the only way to differentiate VHSV isolates from wild marine fishes and farmed rainbow trout. The 2 farmed turbot isolates did not cause mortality by immersion, supporting the view that they originated from the marine environment.

KEY WORDS: VHSV · Infection trials · Rainbow trout · Pathogenicity

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