Freshwater fish populations plunge 81% as river migrations collapse

Freshwater fish populations plunge 81% as river migrations collapse One of Earth’s greatest migrations is collapsing beneath our rivers.

• Date:
• March 26, 2026
• Source:
• Convention on the Conservation of Migratory Species of Wild Animals (CMS)
• Summary:
• A sweeping global report finds that migratory freshwater fish are in steep decline, with populations down roughly 81% since 1970. These species depend on long, connected rivers, but dams and human pressures are cutting off their routes....