Publication

Endangered and Threatened Wildlife and Plants, Final Rule to List the Rio Grande Silvery Minnow as an Endangered Species

URL: https://webapps.usgs.gov/mrgescp/documents/USFWS_1994_Endangered%20and%20Threatened%20Wildlife%20and%20Plants%20Final%20Rule%20to%20List%20the%20RGSM%20as%20an%20Endangered%20Species.pdf

Date: 1994/07/20

Author(s): USFWS

Publication: U.S. Code of Federal Regulations, Title 50, Part 17

Abstract:

The U.S. Fish and Wildlife Service (Service) determines the Rio Grande silvery minnow (Hybognathus amarus) to be an endangered species under the Endangered Species Act of 1973 (Act), as amended. This fish occurs only in the middle Rio Grande from Cochiti Dam downstream to the headwaters of Elephant Butte Reservoir, New Mexico. Threats to the species include dewatering, channelization and regulation of river flow to provide water for irrigation; diminished water quality caused by municipal, industrial, and agricultural discharges; and competition or predation by introduced non-native fish species. Currently. the species Occupies about five percent of its known historic range. This action will implement Federal protection provided by the Act for the Rio Grande silvery minnow. The Service further determines that finalization of proposed critical habitat will not occur at this time, as critical habitat is not now determinable because the required economic analysis has not been completed. Pursuant to section 4(b)(6)(C)(ii) of the Act, a final determination on critical habitat may be delayed up to 1 year beyond the normal deadline.