This video shows some of the 10,000 baby sea trout freed on 2 April 2016 in brooks in Drenthe province in the Netherlands. As the fish grow up, they will migrate downstream, until they reach the Wadden Sea. They will live at sea for years, until they will return to the fresh water to spawn.
Update April 2019: here.
Pingback: Scottish freshwater pearls, in history and now | Dear Kitty. Some blog
Pingback: Gull, crow eat trout | Dear Kitty. Some blog