Meta Identifier	USFWS_parasite
Type of Data	Fish parasites
Originator	U.S. Fish and Wildlife Service
Description	650 Juvenile salmonids (primarily Chinook) were collected from five location in the lower Trinity and Klamath Rivers as well as the Klamath estuary during the period of May 30 to July 30, 2001. All fish were examined for either external signs of disease (i.e. darken skin coloration, lesions, pale gills, swollen appearance, reduced swimming ability or avoidance behavior). Data presented in KRIS charts/tables are only one portion of the full study.
Area	lower Klamath, Trinity River, and Salmon Rivers
Metadata Date	7/31/2003
Metadata Contact	Eli Asarian
Contact Person Primary	J.Scott Foott
Status	integrating
Progress Log
Lead Person	Eli Asarian
Lead Organization	IFR-KRIS
Data Set Name	fish_parasites_klam_usfws_2001.db
Date of Content Start	5/30/2001
Date of Content End	7/30/2001
Purpose	To determine the extent of parasitic infection of juvenile salmonids (especially Chinook) in the lower Klamath River basin.
Data Quality Information	Excellent
Keywords	parasites, Chinook, Klamath
Publisher	USFWS California-Nevada Fish Health Center
Publication Place	Anderson, CA
Publication Date	February 2002
Abstract	Over 650 Chinook salmon (Oncorhynchus tshawytscha) juveniles were examined at 5 sites in the Klamath River (R.) basin during the months of June and July 2001. Diagnostic tests were performed on a subset of the examined fish to determine the cause of morbidity. Juvenile Chinook salmon captured in the lower Trinity R. were generally healthy. In contrast, two parasitic infections caused significant sickness and mortality in salmon collected in the Klamath R. and estuary. A myxosporean parasite infection of the kidney induced glomerulonephritis and kidney swelling. The health effect of this kidney infection is unclear. Varying degrees of enteritis were caused by Ceratomyxa shasta infection. Ceratomyxosis appears to be the leading cause of mortality and sickness in the Klamath R. and estuary during the summer of 2001. Elevated water temperature in the Klamath R. and estuary were associated with lower muscle lipid content and gill ATPase activities. Ceratomyxosis resulted in elevated blood neutrophil numbers and lysozyme activity. Plasma protein values were also reduced in affected fish. Future monitoring should concentrate on estuary sampling of marked fish to determine the relative effect of ceratomyxosis on Klamath R. (Iron Gate Hatchery) and Trinity R. (Trinity R. Hatchery) juvenile Chinook salmon. Rapid response to elevated juvenile or adult mortality would be another aspect of a future monitoring program.
Storage Location	Anderson, CA
Contact Organization	U.S. Fish and Wildlife Service
Contact Address	24411 Coleman Hatchery Road
Contact City	Anderson
Contact State	CA
Contact Zip Code	96007
Contact Voice Telephone	(530) 365-4271
Contact Fax	(503) 365 7150

 
 
 

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