International audienceIn the U.S. portion of the Columbia Bassin, salmon populations are five times lower than 150 years ago. They are co-managed by federal, state and tribal protagonists in order to restore them. On this territory larger than France, the federal government dominates the governance relating to the co-management of endangered and threatened species of salmon. The NOAA Fisheries Service writes up recovery plans and biological opinions that guide the actions on the ground. State and tribal agencies carry out multiple tasks on the ground, including the reintroduction of local salmon populations, the restoration of riparian areas, the management of salmon hatcheries or the enforcement of fishing rules. At the same time, a federa...