We, NMFS, announce updates to the descriptions of Pacific salmon and steelhead (Oncorhynchus spp.) species that are currently listed as threatened or endangered under the Endangered Species Act of 1973 (ESA). Updates include the addition or removal of specific hatchery programs, as well as clarifying changes to the names of specific hatchery programs included as part of the listings of certain Pacific salmon and steelhead species. These changes are informed by our most recent ESA 5-year reviews, which were completed in 2016. We are not changing the ESA-listing status of any species under NMFS's jurisdiction, or modifying any critical habitat designation. The updates also include minor changes in terminology to standardize species descriptions.