The world’s great fish migrations are collapsing – that’s a problem for millions of people

A new report finds 325 migratory fish species in urgent need of help, including some of the world’s most iconic freshwater giants.

By: Zeb Hogan, University of Nevada, Reno, The Conversation

Outlets: The Conversation

Published: March 24, 2026

Words: 1,366

Last Updated: 4 months, 1 week ago

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By Zeb Hogan, University of Nevada, Reno

Hidden beneath the surface of the world’s rivers, some of Earth’s great animal movements unfold – migrations that rival, in sheer biomass, the famous mass movements of zebra and wildebeest across the Serengeti.

For centuries, fish migrations were as predictable as the seasons. Salmon, sturgeon, giant catfish and many other species moved through rivers in vast numbers, guided by rising water, flood pulses and evolved biological cues.

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