Abstract
Atlantic salmon which had been vaccinated against cold-water vibriosis were still protected up to 2 years after vaccination. Previous observations had revealed a mean relative percentage survival (RPS) 1 year after vaccination of 92. In outbreaks of the disease in two farms 1.5 to 2 years after vaccination, the RPS was 50 and 60, respectively, showing that the protection provided by the vaccine declined with time. When the experimental fish at six farms were slaughtered, it was found that vaccinated fish had a lower weight than unvaccinated. This might have been a side-effect of vaccination, though may also have been due to higher mortality among the smaller fish in the unvaccinated group. Results of the field trial showed that only half of the smolt which were transferred to sea-water reached market size 1.5 to 2 years later. The rest was lost due to diseases, accidents, or from unspecified of undetected causes.
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