… [S]cientists from across the state and as far away as Norway published a study tracking the long-term collapse of salmon age diversity, finding that today’s Chinook salmon populations in the Central Valley are all-in on a single bet. Three-year-olds dominate the group, while 5-year-olds are rare and 6-year-olds are mostly absent. The study was focused on the Feather River and its tributary, the Yuba River. … The loss of age diversity helps explain why modern salmon runs swing so wildly from abundance to collapse.

Other fishery news:

• Fresno Bee (Calif.): Yuba Water reports salmon and steelhead habitat affected during pipe rupture
• Engineering News and Review: Klamath River renewal project: Tight collaboration on historic dam removal brings back salmon
• Daily Kos: Blog: California’s 2026 ocean salmon season set to open April 11 from Pigeon Point south
• California WaterBlog (UC Davis): Resilient California fishes: Sacramento pikeminnow