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Risk of disease transfer with wellboats in Norway – Technical report

Lyngstad TM, Høgåsen HR, Jansen MD, Nilsen A. Risk of disease transfer with wellboats in Norway – Technical report. Veterinærinstituttets rapportserie 15-2015. Oslo: Veterinærinstituttet; 2015.

Wellboats may theoretically contribute to the spread of diseases in Norwegian aquaculture, but to what extent this actually happens is unclear. The field is complex, and suspicions can rarely be confirmed nor disproved with certainty.

Risk assessment analyzes risk in a systematic and scientific way. In this report we collect data of significance to perform such a risk assessment. This information will later be used to assess to what extent the spread of infection with wellboat in Norwegian aquaculture may occur, which parts and pathways lead to the greatest risk, and how risk can be reduced in the most efficient way.

The first part of the report is devoted to wellboat activity. We present information about the Norwegian wellboat fleet, applicable regulations, different transport types, the number of fish being transported, how extensive the wellboat transport is, which routes are used, the loading and unloading of fish, replacement of water, surfaces in the wellboat, and biosecurity measures.

The second part of the report is devoted to significant infectious agents in Norway. We present information about the agents’ distribution, excretion and concentration in water, survival in the environment and in biofilm, susceptibility to disinfectants, and infectious dose.

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