March 14, 2018 — Currents in the ocean spread viruses that are killing large numbers of Norway’s farmed salmon. Where should fish farms be built? And should they all be in use at the same time? Researchers now know more about how to limit the virus problem.
Pancreas disease is a viral infection in farmed salmon that causes major economic losses because it reduces how much the fish grow and increases mortality. When farmed salmon are weakened, they also become more susceptible to other diseases. Pancreas disease (PD) can resolve on its own, but often mortality is high.
Researchers monitored the ocean currents in the Romsdalsfjord and in Nord- Trøndelag county in 2014. Data from the observations have been transferred to a digital model, where researchers then depicted virtual virus particles in order to understand how the disease can spread from one fish farm to another. In addition to threatening fish welfare, every year the disease leads to major losses for Norwegian salmon breeders. A single outbreak can quickly cost a small aquaculture operation more than $1 million.
Ocean currents are one of the most important pathways for the disease, carrying the virus from one fish farm to the next. Planning for where best to locate aquaculture facilities, and knowledge of which facilities to use when combatting the disease, can prevent the spread of the disease, new research from NTNU in Ålesund shows.
Read the full story at Maritime Executive