DAO 50:13-18 (2002)  -  doi:10.3354/dao050013

Investigation into the susceptibility of saithe Pollachius virens to infectious salmon anaemia virus (ISAV) and their potential role as a vector for viral transmission

M. Snow1,*, R. Raynard1, D. W. Bruno1, A. P. van Nieuwstadt2, N. J. Olesen3, T. Løvold4, C. Wallace4

1Fisheries Research Series (FRS) Marine Laboratory, PO Box 101, Victoria Road, Aberdeen AB11 9DB, Scotland, UK
2ID-Lelystad Institute for Animal Science and Health. PO Box 65, Lelystad 8200AB, The Netherlands
3Danish Veterinary Laboratory, Department of Poultry, Fish and Fur Animals, Hangøvej 2, 8200 Aarhus, Denmark
4Veterinærmedisinsk Oppdragssenter AS (VESO) Vikan Akvavet, Alhusstrand, 7800 Namsos, Norway

ABSTRACT: Wild-caught saithe Pollachius virens were experimentally exposed to an isolate of infectious salmon anaemia virus (ISAV) of Norwegian origin. Mortality attributable to ISAV did not occur following exposure by intra-peritoneal (i.p.) injection of virus or by cohabitation with ISAV-infected Atlantic salmon Salmo salar. Despite the individual testing of 120 ISAV-exposed saithe, ISAV was not detectable using RT-PCR, the most sensitive ISAV diagnostic tool demonstrated to date. Furthermore, saithe exposed to ISAV-infected salmon were not capable of transmitting virus when transferred to tanks containing naïve salmon. Thus saithe appear to be resistant to this Norwegian isolate of ISAV and incapable of supporting its replication. Saithe which co-exist with salmon in and around aquaculture facilities are considered unlikely to have a significant impact on the epizootiology of ISAV.

KEY WORDS: Infectious salmon anaemia virus · ISAV · Orthomyxovirus · Saithe · Pollachius virens

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