Service reopens public comment period on proposal to list Panama City crayfish under Endangered Species Act Also proposes critical habitat and 4(d) rule to provide for its conservation April 14, 2021 Panama City, Fla. – The U.S. Fish and Wildlife Service is reopening the public comment period on its 2018 proposal to list the Panama City crayfish as a threatened species under the Endangered Species Act (ESA). The Service is also proposing to designate a critical habitat for the crayfish, and a special 4(d) rule, designed to conserve the crayfish while allowing greater flexibility for landowners. A draft economic analysis of the proposed critical habitat designation is also being released with today’s proposed rule.