USFWS has determined endangered species status under the ESA, for the peppered chub (Macrhybopsis tetranema), a freshwater fish species historically found in Colorado, Kansas, New Mexico, Oklahoma, and Texas, which is now extirpated from all but six percent of its historical range. They also designated critical habitat. In total, approximately 872 river miles (1,404 river kilometers) in New Mexico, Oklahoma, and Texas fall within the boundaries of the critical habitat designation. They are excluding approximately 197 river miles (317 river kilometers) of critical habitat in Kansas that was included in the proposed critical habitat designation. This rule adds the species to the List of Endangered and Threatened Wildlife and extends the Act's protections to the peppered chub designated critical habitat. This rule is effective 30 March 2022. POC is Debra Bills, Field Supervisor, USFWS, Arlington, Texas, Ecological Services Field Office, 2005 Northeast Green Oaks Boulevard, Suite 140, Arlington, TX 76006; tel 817-277-1100. (Federal Register 28 February 2022 [Rule] Pages 11188-11220).