We have a similar issue here in Switzerland (a river that ends in the ocean in northern Germany) were salmon disappeared 50years ago. Too many gates, hydroelect

We have a similar issue here in Switzerland (a river that ends in the ocean in northern Germany) were salmon disappeared 50years ago. Too many gates, hydroelectric plants etc. Apparently they saw the first salmon coming back after 50 years: https://www.spiegel.de/international/zeitgeist/fish-story-first-salmon-caught-in-basel-in-50-years-a-583127.html https://www.spiegel.de/international/zeitgeist/fish-story-fi... As a child I heard that story about bringing the salmons back. That it took 50 years and not yet a success is somehow very disappointing and I wonder if other countries will afford such ling-term restoration projects.