Wednesday, May 23, 2012

IHN Outbreak in Clayouqot Sound Fish Farms

A fish farm in Clayouqot Sound has been quarantined and 570,000 Atlantic Salmon have been euthanized following an outbreak of infectious hematopoietic necrosis virus (IHN). IHN is a native pathogen which is naturally present in wild salmon populations, however hatcheries and fish farms which hold fish in high densities can increase the transmission and virulence of the disease. Under these conditions IHN can be retransmitted to wild salmon with potentially detrimental effects on survival, particularly for juveniles. Last year IHN was found in hatchery steelhead from the Bogachiel Hatchery and was subsequently found in several populations of wild steelhead on the Olympic Peninsula. The virus also led to major cullings in farms on the east coast of Vancouver Island in 2002-2003.

More information in the Vancouver Sun:

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