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INFECTIOUS HAEMATOPOIETIC NECROSIS

Definition

An acute viral disease of juvenile salmonids. Until recently, this disease was recorded as Oregon Sockeye Disease, Sacramento River Chinook Disease, Columbia River Sockeye Disease, and Leavenworth Sockeye Disease. The primary species affected are Chinook salmon, Rainbow trout and Sockeye salmon. The disease is endemic in the western U.S. with sporadic outbreaks occurring in other parts of the country. The virus is considered to be egg-transmitted. Losses are quite high in fish of less than 5 cm in water temperatures below 100C. The recommended control methods include chemical disinfection of eggs, elimination of carrier females, and depopulation of affected stocks; Virus of the Rhabdovirus group.

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