Freshwater fish populations have decreased by 81%.
The report highlights the critical state of river ecosystems.
Migrations are considered one of nature's great wonders.
Strategic angle: Vast journeys, among world’s great wonders, found to be under threat as freshwater fish populations crash by 81%.
Freshwater fish populations have decreased by 81%.
The report highlights the critical state of river ecosystems.
Migrations are considered one of nature's great wonders.