Protected Resources

Giant Clams

Colorful photo of multiple giant clams of unknown species taken in Kingman Reef, part of the Line Islands which is a U.S. Pacific Island Territory. Giant clams in Kingman Reef, part of the Line Islands, a U.S. Pacific Island Territory. Photo: NOAA Fisheries/Kevin Lino

Current Management Issues

On August 7, 2016, we received a petition from Dwayne Meadows, Ph.D., to list the Tridacninae giant clams (excluding Tridacna rosewateri) as threatened or endangered under the ESA, and to designate critical habitat concurrently with listing the species.

On June 26, 2017, NOAA Fisheries made a positive 90-day finding (82 FR 28946), determining that the petitioned action may be warranted for seven of the species included in the petition. These species are follows: Hippopus hippopus, H. porcellanus, Tridacna squamosa, T. costata, T. gigas, T. derasa, and T. tevoroa. We will conduct status reviews of these seven species to determine if the petitioned action is warranted.

To submit scientific and commercial information pertaining to these species, visit the 90-day Finding to List 10 Species of Giant Clams on the Federal Register. Comments are due by August 25, 2017.

We also made a negative 90-day finding, determining that the petition does not present substantial scientific or commercial information indicating that the petitioned action may be warranted for the remaining three giant clam species in the petition: Tridacna maxima, T. crocea, and T. noae.

For more information and supporting documents:

For more information on the Endangered Species Act, visit the Protected Resources Endangered Species Act: Section 4 page.