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US Fish & Wildlife Service FieldNotes
FISH HEALTH: California-Nevada Fish Health Center Leads Collaborative Monitoring Program for Fish Disease in Klamath River Salmon
Region 8, September 24, 2007
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