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IHN outbreak in trout farms in Denmark

Tuesday, June 1, 2021

Three trout farms in Denmark are infected by infectious haematopoietic necrosis (IHN), according to the Danish Veterinary and Food Administration. 

“Unfortunately, our studies show that another fish farm is infected with IHN. We have set up a restriction zone in the drainage area around the fish farm to prevent further spread of infection,” said deputy head of the Danish Veterinary and Food Administration, Tim Petersen.

The Danish Veterinary and Food Administration does not yet know the source of the outbreak, but it seems to be related to other virus detections in Germany and Finland. In order to limit the spread of infection, the Danish Veterinary and Food Administration is tracing contacts to the infected fish farms, including the consignments of fish sent to and from the infected fish farms. 

IHN affects salmonids such as rainbow trout, Atlantic salmon, char and Pacific salmon but also a large number of other fish species. Norway showed its concern since it has an IHN free status and the disease has never been detected in the country. “The introduction of IHN to Norway will have serious consequences for fish health and the Norwegian aquaculture industry,” Norwegian authorities said.

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