Migratory Fish Populations Plummet Globally
Why this is here: The report assessed over 15,000 freshwater fish species, a substantial increase from the 3,000 evaluated in 2011, providing a more comprehensive understanding of the crisis facing these migratory populations.
An international assessment found migratory freshwater fish populations have declined by 81% since 1970. Researchers evaluated over 15,000 species, revealing threats from dams, pollution, and overfishing. The UN report prioritizes thirty flagship species—including Allis Shad and Atlantic Salmon—for global conservation.
Migratory freshwater fish provide food for 200 million people worldwide and exhibit immense diversity. The UN first assessed 3,000 species in 2011, expanding its analysis significantly for this report. Researchers identified 325 fish needing monitoring and support, with 30 designated as priorities due to their cultural significance.
Habitat loss and overfishing pose major threats. Barriers like dams and culverts disrupt migration routes, impacting fish energy reserves and increasing vulnerability to disease and predation. The UN proposes adding these 30 species to a migratory species treaty to foster international cooperation for recovery.