This week, the U.S. Army Corps of Engineers began installing permanent barriers at Bonneville Lock and Dam to keep sea lions from entering fish ladders — a key element in a new strategy to cut down mammals’ predation on migrating adult salmon.
This week, the U.S. Army Corps of Engineers began installing permanent barriers at Bonneville Lock and Dam to keep sea lions from entering fish ladders — a key element in a new strategy to cut down mammals’ predation on migrating adult salmon.