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Candidate and Proposed Species Under the Endangered Species Act (ESA)

Candidate species are any species that are undergoing a status review that we have announced in a Federal Register notice, whether or not they are the subject of a petition. For detailed definitions and explanations, please refer to the 2006 Candidate Species Definition (71 FR 61022, 10/17/2006).

Proposed species are those candidate species that were found to warrant listing as either threatened or endangered and were officially proposed as such in a Federal Register notice after the completion of a status review and consideration of other protective conservation measures. We always seek public comment on a proposal to list species under the ESA. We generally have one year after a species is proposed for listing under the ESA to make a final determination whether to list a species as threatened or endangered.

Candidates for Listing (13 candidate "species")

Species Year Federal Register notice

Salmon, Chinook
(Oncorhynchus tshawytscha)

  • Upper Klamath-Trinity Rivers ESU
2018 83 FR 8410
(Alosa pseudoharengus)
2017 82 FR 38672
(Brosme brosme)
2007 72 FR 10710
herring, blueback
(Alosa aestivalis)
2017 82 FR 38672
seahorse, dwarf
(Hippocampus zosterae)
2012 77 FR 26478
Marine Invertebrates
clam, giant (7 candidate species)
(Hippopus hippopus)
(Hippopus porcellanus)
(Tridacna costata)
(Tridacna derasa)
(Tridacna gigas)
(Tridacna squamosa)
(Tridacna tevoroa)
 -- petition
2017 82 FR 28946
Sea Turtles
turtle, leatherback
(Dermochelys coriacea)
2017 82 FR 57565


Proposed for Listing (3 proposed "species")

Species Year Proposed Status
Marine Mammals

dolphin, Indo-Pacific Humpback (1 subspecies)
(Sousa chinensis)

  • Taiwanese humpback dolphin
    (Sousa chinensis taiwanensis)
2017 proposed endangered

whale, Bryde's (1 subspecies)
(Balaenoptera edeni)

  • Gulf of Mexico Bryde's whale
    (unnamed subspecies)
2016 proposed endangered
Marine Invertebrates

nautilus, chambered
(Nautilus pompilius 


proposed threatened


Endangered and Threatened Species Under NMFS' Jurisdiction:

Additional Species:

Updated: January 29, 2018