MOUTH OF THE KLAMATH RIVER, California — Sheldon SmilingCoyote locked his eyes on the push and pull of the waves in front of him, suddenly slashing the tip of his handheld hook through the water, pulling out a slimy prehistoric fish. Lassoing the lamprey over his head to keep it from squirming off the hook, he ran to a hole he'd dug in the sand and released the fish on a pile of its relatives. SmilingCoyote tallied two dozen in his catch on a late February day. These nutrient-rich fish, a wintertime staple for the Yurok people, lost 400 miles of their historical spawning habitat to four dams t...