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Like flyways for birds, we need to map swimways for fish

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Summary
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Migratory freshwater fish populations worldwide have plummeted by more than 80 percent since 1970 .

Global swimways for migratory fish are emerging as a vital framework for maintaining freshwater ecosystem connectivity.

Researchers are working to create detailed maps of species-specific migration routes in rivers worldwide.

Dams block breeding and feeding habitats, disrupting migration routes.

Technology for tracking freshwater fish migrations still lags far behind that used to study birds.

Researchers point out that rivers are often misunderstood as simple, linear systems when their reality is far more complex.

Many rivers also span multiple countries, making international cooperation essential to keeping migration routes open and accessible.