World Fish Migration Day, which will take place on May 23, 2026, aims to raise awareness of the importance of migratory fish and free-flowing rivers. Some fish must migrate to ensure the survival of their species, but their migratory routes are increasingly blocked. Even protected areas offer little protection because they are often unsuitable for aquatic life. The combination of these physical barriers and inadequately protected aquatic habitats means many migratory freshwater fish species can no longer use their natural routes.