[ODFW-News] IHN disease found in Cole Rivers Hatchery rainbow trout

[ODFW News]

Oregon Department of Fish and Wildlife


Contact: Meghan Collins (541) 440-3353 or Randy Robart (541) 878-2235


Internet: www.dfw.state.or.us <http://www.dfw.state.or.us/>   Fax: (541)
673-0372

               

 


For Immediate Release
Tuesday Aug. 30, 2005


 


IHN disease found in Cole Rivers Hatchery rainbow trout 


 

CENTRAL POINT - Oregon Department of Fish and Wildlife biologists today
announced the presence of an untreatable fish disease in rainbow trout
at Cole Rivers Hatchery.

 

Officials said Infectious Hematopoietic Necrosis Virus, or IHN, was
found in eight raceways where 390,000 rainbow trout are being raised.
The fish were destined for release next year in lakes and reservoirs in
the Rogue and Coos basins, the Rogue River above Lost Creek Dam, and the
Willamette Valley. 

 

"We don't yet know the impacts for the 2006 stocked trout fishery," said
Randy Robart, Cole Rivers Hatchery manager. "Right now, we're doing
everything we can to avoid spreading the disease." 

 

As of last Friday, 50,000 of the infected rainbow trout had died, noted
Robart. 

 

During the next several weeks, ODFW managers will be discussing options
for 2006 trout stocking in the Rogue and Coos basins and the Willamette
Valley.

 

IHN previously has been found in naturally spawning fall chinook salmon
in the Rogue River and at Cole Rivers Hatchery in spring chinook and
steelhead. The virus again was detected earlier this year in adult
steelhead and spring chinook salmon during routine fish health
monitoring, but no losses were observed. The only previous loss in the
hatchery was in 1991 when one of six ponds of spring chinook fry was
euthanized.

 

ODFW tests for pathogens and disease routinely during the rearing cycle
from eggs to when the fish are released as smolts or legal-sized fish.
The disease in the rainbow trout was first detected late last week. 

 

IHN initially attacks the blood-forming tissues of the kidney. External
symptoms include lethargy, darkening of the skin and hemorrhaging at the
base of the fins.

 

 

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