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Diseases of Aquatic Organisms

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DAO 102:23-31 (2012)  -  DOI:

Cohort study of effect of vaccination on pancreas disease in Norwegian salmon aquaculture

Britt Bang Jensen1,*, Anja B. Kristoffersen1,2, Camilla Myr3, Edgar Brun1

1 Section for Epidemiology, Norwegian Veterinary Institute, 0106 Oslo, Norway
2Department of Informatics, University of Oslo, PO Box 1080, Blindern 0316 Oslo, Norway
3PD-free Project/The Norwegian Seafood Research Fund, 5035 Sandviken, Norway

ABSTRACT: Pancreas disease (PD) is an economically important viral disease in Norwegian aquaculture, with 75 to 89 annual outbreaks from 2009 to 2011. To hinder further spread of disease from an initial endemic area on the west coast of Norway, measures for surveillance and control are in place, and the disease is notifiable on a national level. Since 2008, the Norwegian coastline has been divided in 2 administrative zones separated by a production-free area of 10 nautical miles at approximately 63°N. At the same time, a vaccination program involving most marine salmonid farms was initiated by the industry, using a vaccine against PD that was made commercially available in 2007. The effects of the vaccine in the field have been questioned, since the annual number of PD outbreaks has not decreased as expected. However, other production parameters can be used for evaluation of vaccine effect, and in this study the effects of vaccination on cumulative mortality, growth rate, feed conversion factor and number of discarded fish were analyzed using data collected from fish cohorts with and without PD put to sea between spring 2007 and spring 2009. The results show that vaccination against PD has a positive effect in reducing the number of outbreaks, and decreasing cumulative mortality and the number of fish discarded at slaughter.

KEY WORDS: PVD · Atlantic salmon · Salmonid alphavirus · Vaccine evaluation · Field study

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Cite this article as: Bang Jensen B, Kristoffersen AB, Myr C, Brun E (2012) Cohort study of effect of vaccination on pancreas disease in Norwegian salmon aquaculture. Dis Aquat Org 102:23-31.

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