Parasite Ceratonova shasta kills Chinook salmon in Klamath

By The BriefBrief

Ceratonova shasta is causing severe infections and deaths among Chinook salmon in the Klamath River.

WHO: Sascha Hallett, Oregon State University

WHAT: Hallett said fish reactions to the parasite have been unusually severe, with mature parasites detected in sick and dead Chinook salmon.

WHEN: Jun 22, 2026 at 12:09 PM ET

WHERE: Klamath River, California and Oregon

WHY: Chinook salmon are infected with the parasite Ceratonova shasta, leading to severe disease and premature death, with mature parasites detected in dead and sick fish.

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