Oshun O’Rourke waded into the dark green water, splashing toward a net that her colleagues gently closed around a cluster of finger-length fish.

The Klamath River is wide and still here, making its final turn north to the coast as it winds through the Yurok reservation in Humboldt County. About 150 baby chinook salmon, on their long journey to the Pacific, were resting in cool waters that poured down from the forest.