Mahseer swim in the Ramganga River, a major tributary of the Ganges River in South Asia. Zeb Hogan

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.

Originally published on theconversation.com, part of the BLOX Digital Content Exchange.

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