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Coastal currents spread disease in salmon

By Tim Sandle     Nov 6, 2013 in Environment
Pancreas disease (PD) is currently the most serious of the viral infections affecting Norwegian farmed salmon. Research indicates that the spread of the disease is affected by the environment.
The research shows how both infected and dead salmon can shed the salmonid pancreas disease virus into the sea and the virus particles can be spread by the wind and ocean currents from one fish farm to the next along the coast. Salmon live along the coasts of both the North Atlantic and Pacific Oceans, and have also been introduced into the Great Lakes of North America.
Problematically the virus can survive for long periods of time outside the salmon host in cold, clean seawater and it therefore has a strong infective potential along the Norwegian coast.
Using something called a hydrodynamic model, researchers have been able to demonstrate that the transmission of the disease between fish farms at different locations is primarily caused by the direction of ocean currents near the surface of the water. Hydrodynamics is the study of motion of liquids, and in particular, water. A hydrodynamic model is a tool able to describe or represent in some way the motion of water.
The findings reveal that fish farms located in close proximity to infected/diseased salmon and fish farms owned by companies with many other infected farms have an increased risk of their stocks becoming infected with the virus.
The research was led by Anne Stene of the Norwegian School of Veterinary Science.
More about Salmon, Disease, Virus, Coast, Sea
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