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250) could leave the impression that the evolutionary significant unit (ESU) is the de facto concept employed for all listing decisions under the Endangered Species Act.
Steelhead (Oncorhynchus mykiss) Based on findings by the National Marine Fisheries Service, the FWS published a notice in the June 17 Federal Register formally listing several Evolutionary Significant Units (ESU) of this trout species for ESA protection.
An evolutionary significant unit, or ESU, represents the basic building block of conservation.