Freshwater fish migrations are collapsing worldwide

A UN report presented at COP15 says migratory freshwater fish populations have declined about 81% since 1970 and identifies 325 species as candidates for international conservation.

UN experts presented a global assessment at the Convention on Migratory Species' COP15 meeting in Brazil that finds many migratory freshwater fish are experiencing rapid collapse. The report emphasizes that these underwater migrations support river ecosystems and provide food for large human populations. Authors identified 325 species as candidates for cross-border conservation attention. It links declines to loss of connectivity, altered flows, habitat degradation, exploitation, and pollution. Key facts: - The report, released at CMS COP15, states that many important freshwater migrations are breaking down and calls for coordinated cross-border collaboration. - Migratory freshwater fish populations have declined by roughly 81% since 1970, and the authors flagged 325 species for possible international conservation efforts. - The report recommends protecting migration corridors, basin-scale action plans, transboundary monitoring, and international coordination of seasonal fisheries. Summary: The report indicates that these declines affect river ecological functions and the people who depend on them. Undetermined at this time.