When four dams were torn down along the California-Oregon border two years ago, scientists were stunned by the large numbers of salmon that moved so quickly up the newly unobstructed Klamath River. This month brought another striking development. A Chinook salmon was detected going up the river in Oregon, past the former dam sites, and it was not part of the fall run of fish that’s already been racing up the Klamath in late summer and in early fall. It was a much rarer fish: a spring-run salmon, which migrates earlier in the year and has long struggled to survive on the West Coast. … The success of the run, on top of the fall run, stands to increase the prevalence, diversity and resilience of struggling West Coast salmon.

Other anadromous fish news:

• Bay Nature (Berkeley, Calif.): What I learned by fishing without rod, reel, or hook: A photographer’s 4,000-mile journey to find California’s native trout
• The University of British Columbia: Blog: Warming streams are pushing young salmon beyond their limits: new research​