Klamath River Juvenile Salmon Health Monitoring Update - June 26, 2026

The California-Nevada Fish Health Center (Center) works collaboratively with the Service’s Arcata Fish and Wildlife Office (AFWO) and the Karuk and Yurok tribes to monitor the prevalence of Ceratonova shasta infections in juvenile salmon in the Klamath River. The Center coordinates this annual monitoring project, provides laboratory support, and generates an annual summary report for the study. AFWO and tribal biologists are responsible for collecting fish samples for the Center.

For the 2026 outmigration season, the Center will strive to provide Quantitative Polymerase Chain Reaction (QPCR) testing of juvenile Chinook Salmon collected in a time-sensitive manner. The goal is to provide stratified estimates of C. shasta prevalence of infection (POI) and DNA copy number to managers on a regular basis during the outmigration season.