Disease Monitoring – Juvenile Fish

Fish disease outbreaks in the Lower Klamath River may have a detrimental effect on out migrating juvenile Trinity River salmon and steelhead. The California-Nevada Fish Health Center examines juvenile Klamath River Chinook salmon for the incidence of two infectious diseases caused by parasites.  From April 20 through August 10, 2009, Ceratomyxa shasta was detected in 45 percent (489/1090) and Parvicapsula minibicornis was detected in 80 percent (873/1090) of Klamath Chinook juveniles tested. Detection of disease organisms does not necessarily mean the fish will succumb to the disease.

For updates, please visit http://www.fws.gov/arcata/fisheries/projectUpdates.html#fishHealth

See also TRRP’s Adult Fish Disease page.

Suggested further reading:

True, K; Foott, J S; Bolick, A; Benson, S; and Fogerty, R (2010) Myxosporean parasite (Ceratomyxa shasta and Parvicapsula minibicornis) incidence and severity in Klamath River basin juvenile chinook salmon, April-August 2009.

CDFG (2004) September 2002 Klamath River fish-kill: final analysis of contributing factors and impacts.

Nichols, K; Therry, D; and Foott, S (2003) Trinity River fall chinook smolt health following passage through the lower Klamath River, June – August 2002.

CDFG (2003) September 2002 Klamath River fish kill: preliminary analysis of contributing factors.

Foott, J S (1997) Renibacterium salmoninarum and Nanophyetus metacercaria infection in adult chinook salmon: Trinity River Hatchery broodstock (1992-94, 1996), Klamath estuary net harvest and KMZ ocean sport catch in 1996.

Foott, J S; Free, D; Talo, W; and Williamson, J D (1996) Physiological effects of Nanophyetus metacercaria infection in chinook salmon smolts (Trinity River).

Foott, J S and Walker, R L (1991) Disease survey of Trinity River salmonid smolt populations.

Search the Library in TRRP’s Online Data Portal for more.