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FISH HEALTH: California-Nevada Fish Health CenterLeads Collaborative Monitoring Programfor Fish Disease inKlamath River Salmon
California-Nevada Offices , September 24, 2007
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Necropsy.  FWS employee Ryan Slezak collects tissues for PCR analysis.  Photo by Ken Nichols, USFWS, 8/17/2006
Necropsy. FWS employee Ryan Slezak collects tissues for PCR analysis. Photo by Ken Nichols, USFWS, 8/17/2006 - Photo Credit: n/a
Hemorrhaged (red color) intestine due to severe Ceratomyxa shasta infestation in juvenile Klamath R. Chinook Salmon.  Photo by Scott Foott, USFWS, 6/26/2003
Hemorrhaged (red color) intestine due to severe Ceratomyxa shasta infestation in juvenile Klamath R. Chinook Salmon. Photo by Scott Foott, USFWS, 6/26/2003 - Photo Credit: n/a

By Ken Nichols, CA-NV Fish Health Center 
Disease, due to infection with Ceratomyxa shasta (Myxosporean parasite which causes Ceratomyxosis), has been identified as a significant cause of mortality in juvenile Klamath River Salmon.  The California-Nevada Fish Health Center provided field crew training and laboratory analysis for juvenile salmonids disease monitoring on the Klamath River.  In 2007, overall incidence during May-July (the peak of out-migration) was 21% of 808 juvenile Chinook assayed.  Past studies monitoring C. shasta incidence in out-migrating juvenile Klamath Chinook found 20-50% to be infected during this period.  The incidence of infection in 2007 appears to be among the lowest observed in recent years.


Contact Info: Ken Nichols, 530-365-4271 x203, Ken_Nichols@fws.gov



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