An ancient salmon that stayed inlandSourced
A salmon relative appears to have lived its whole life in fresh water.
Eosalmo fossils from Eocene lake deposits in western North America include juveniles and adults. That pattern supports a full freshwater life cycle, unlike the sea-going phase of many modern salmon. Salmon history had more than one route.
For this fish, the river did not have to lead to the sea.
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Eosalmo · Wikimedia contributors
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Reviewed: 2026-10-01