Norway is the bench mark country for salmon farming, producing more than 1.1 million metric tons per year and growing non-stop. CID LINES has been successfully serving this industry for more than 15 years. Our partnership with VESO is growing faster than the industry.
Kyst.no (coast.no) is one of the leading sites in aquaculture in Norway. One of their major features yesterday was an article titled “This is what it takes to inactivate PRV in Salmon”.
PRV is an abbreviation for Piscine orthoreo virus. This virus is very common amongst Norwegian salmon farms and has recently been found to causes the disease HSMB (Heart and musculoskeletal disorder). There is no effective vaccine against PRV, hence biosecurity is imperative to minimizing its spread to healthy fish populations.
In a study designed by the Norwegian University of Life Sciences from Oslo, researcher and veterinarian Øystein Wessel found that Virocid® in 1% concentration with a contact time of 30 minutes (in cold sea water!) was enough to inactivate the PRV virus.
The study also tested the effect of UV radiation, iodine and heat disinfection on PRV. The results showed that the UV radiation used at many aquaculture facilities today is not strong enough to inactivate PRV. The heat disinfection study showed that after exposure to temperatures as high as 56°C the virus was still active; only at temperatures of 76°C for 20 minutes or more, the virus was inactivated. These temperatures are way above the temperatures in the salmons natural habitat ( 4°C to 19°C max), and cost lots of energy to maintain for 20 minutes. Both heat disinfection and UV require very high capital investments.
Iodine was found to be effective at 50ppm with an exposure time of 5 minutes. The use of iodine disinfection in Norwegian aquaculture is restricted to disinfection of fertilized roe only.
As a summary: Virocid® is the only practical and economical option in the battle against the PRV virus.