At the Gulkana Hatchery, a few people raise a brood of up to 35 million red salmon each year and release them into the Gulkana River system, enhancing one of the richest fisheries in Alaska.
Red salmon gather at a Gulkana Hatchery fish weir that prevents them from going upstream on the east fork of the Gulkana River.
On most days of the summer, fishermen heading to the Copper River to scoop up salmon pass this cluster of small buildings tucked in a shallow valley. Few realize that many of the fish they will catch are born here. In April and May, hatchery workers stock the tiny fish in Summit, Paxson and Crosswind lakes. They accomplish the first two transfers by truck and hose, the latter by airdrop of about 10 million fish from a small plane.
An otolith is an inner ear bone found in salmon and other fish that develops a new layer each year. At other hatcheries, managers have marked salmon fry by gathering them in a tank and varying its water temperature, which leaves distinct marks on the fish’s otoliths.
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