Endangered Species Act Definitions & Policies

Memorandum of Understanding between the U.S. Fish & Wildlife Service and National Marine Fisheries Service Regarding ESA Jurisdiction 25kb
Aug. 28, 1974

Definition of "Species" under the Endangered Species Act: Application to Pacific Salmon
NOAA Technical Memorandum NMFS F/NWC-194, March 1991

Determining Minimum Viable Populations under the Endangered Species Act
NOAA Technical Memorandum NMFS-F/NWC-198, June 1991

Proposed Policy and Proposed Rule on the Treatment of Intercrosses and Intercross Progeny ("Hybridization") 34kb
Federal Register, Vol. 61, No. 26, p. 4709; Feb. 7, 1996

Policy Regarding the Recognition of Distinct Vertebrate Population Segments under the Endangered Species Act 28kb
Federal Register, Vol. 61, No. 26, p. 4722; Feb. 7, 1996

American Indian Tribal Rights, Federal-Tribal Trust Responsibilities, and the Endangered Species Act 46kb
Secretarial Order #3206; June 5, 1997

Habitat Conservation Plan Assurances ("No Surprises") Rule 68kb
Federal Register, Vol. 63, No. 35, p. 8859; Feb. 23, 1998

Request for Information on Candidate Species List under the Endangered Species Act 19kb
Federal Register, Vol. 64, No. 10, p. 2629; Jan. 15, 1999

Final Regulatory Flexibility Analysis for the Final Rule Defining "Harm" in the Definition of "Take" in the ESA 54kb
October 1999

Endangered and Threatened Wildlife and Plants; Definition of "Harm" 31kb
Federal Register, Vol. 64, No. 215, p. 60727; Nov. 8, 1999

Policy for Evaluation of Conservation Efforts When Making Listing Decisions 106kb
Federal Register, Vol. 68, No. 60, p. 15100; Mar. 28, 2003

Policy on the Consideration of Hatchery-Origin Fish in Endangered Species Act Listing Determinations for Pacific Salmon and Steelhead 98kb
Federal Register, Vol. 70, No. 123, p. 37204; June 28, 2005