Designating Experimental Populations under the Endangered Species Act


Endangered Species Act
Action Status
Final Rule


We, the National Marine Fisheries Service (NMFS), issue final regulations to amend the Code of Federal Regulations (CFR) to implement the Endangered Species Act (ESA) regarding experimental populations. This rule amends the CFR to establish definitions and procedures for:

  • Establishing and/or designating certain populations of species otherwise listed as endangered or threatened as experimental populations
  • Determining whether experimental populations are “essential” or “nonessential” 
  • Promulgating appropriate protective measures for experimental populations

Federal Register

Last updated by Office of Protected Resources on 12/04/2017