Atlantic sturgeon

The Atlantic sturgeon is an anadromous fish, which spawns in rivers. The young remain in fresh water for four years before migrating to the sea. It seems that its former spawning grounds on the St. Lawrence have not been used since the 1950s or 1960, perhaps because of the damming of some rivers, overfishing, the dredging of the Seaway and the construction work for Expo 67.