Salmon Evolutionarily Significant Units (ESUs) of the USA

This gallery includes datasets of evolutionarily significant units (ESUs) of salmon in the United States of America. An evolutionarily significant unit, or ESU, of Pacific salmon is considered to be a "distinct population segment" and thus a "species" under the Endangered Species Act. Chinook salmon, Chum salmon, Coho salmon, Pink salmon, Sockeye salmon, and Steelhead are all included.