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| NAS - Nonindigenous Aquatic Species |
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Common Name: relict dace
Synonyms and Other Names: Steptoe dace
Taxonomy: available through 
Identification: Sigler and Sigler (1987); Page and Burr (1991). Maximum size: 13 cm.
Size:
Native Range: Lakes Franklin, Gale, Waring, Steptoe and Spring basins
in eastern Nevada (Page and Burr 1991).
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Nonindigenous Occurrences: Forty-two relict dace were stocked into a warm-water pond at the Shoshone Ponds Natural Area southeast of Ely in White Pine County, Nevada, in 1977 (Clemmer, personal communication). This species may also have been introduced into Spring Valley, Nevada, presumably at Stone House (Hubbs et al. 1974); apparently in reference to this same record, Lee et al. (1980 et seq.) suggested that the Lake Spring population may also be introduced. There is also evidence that the relict dace was introduced to a spring in the Bonneville system of Utah (Hubbs et al. 1974; Lee et al. 1980 et seq.).
Means of Introduction: The Shoshone Ponds population was intentionally introduced for conservation purposes with stock transplanted from ponds in Steptoe Valley, Nevada. The plant created an additional population of a rare species with a restricted range. The introduction of this species into Spring Valley, Nevada, may have been for mosquito control, or possibly as a curiosity (Hubbs et al. 1974). In 1942, a rancher testified that he had taken this minnow from Butte Valley to Lake Mead, where the fish was used as bait (Hubbs et al. 1974); however, we are unaware of any records of this species in Lake Mead.
Status: Locally established. The relict dace population at Shoshone Ponds had increased to an estimated 502 individuals by August 1989 (Clemmer, personal communication). The status of this species in other sites where introduced is unknown.
Impact of Introduction: Unknown.
Remarks: Prior to elimination of the U.S. Fish and Wildlife Service candidate species list, the relict dace was under review for Federal listing as an endangered or threatened species (U.S. Fish and Wildlife Service 1994a).
Other Resources:
FishBase Fact Sheet
Author: Leo Nico
Revision Date: 9/28/1999 Citation for this information:
Leo Nico. 2009. Relictus solitarius. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=636> Revision Date: 9/28/1999
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