Common name: Owens Pupfish
available through www.itis.gov
Identification: Moyle (1976a); Page and Burr (1991).
Size: 7.2 cm.
Native Range: Owens River system in Owens Valley, California, from the springs at Fish Slough in Mono County, to (but not in), Owens Lake, Inyo County, and in the springs around the lake. Currently only found naturally in the Owens Valley Native Fish Sanctuary and in BLM Spring in Fish Slough, a tributary of the Owens River, just north of Bishop (Miller 1968; Miller and Pister 1971; U.S. Fish and Wildlife Service 1984c).
Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Cyprinodon radiosus are found here.
Table last updated 9/30/2019
† Populations may not be currently present.
Means of Introduction: Intentionally stocked to create an additional population of this endangered species where the pupfish could survive without danger of extermination by predatory, nonindigenous fishes or further threatened by competition with introduced mosquitofish (Miller 1968). According to Miller (1968), this site was also intended to study the interspecific relationships among various fishes native to the Owens Valley. The Warm Springs refuge was created in 1970 under the supervision of the California Department of Fish and Game (Miller 1968) and presumably stocked soon afterwards.
Status: Established at Warm Springs, California (U.S. Fish and Wildlife Service 1984c).
Impact of Introduction: The impacts of this species are currently unknown, as no studies have been done to determine how it has affected ecosystems in the invaded range. The absence of data does not equate to lack of effects. It does, however, mean that research is required to evaluate effects before conclusions can be made.
References: (click for full references)
Page, L. M., and B. M. Burr. 1991. A field guide to freshwater fishes of North America north of Mexico. The Peterson Field Guide Series, volume 42. Houghton Mifflin Company, Boston, MA.
U.S. Fish and Wildlife Service. 1984c. Recovery plan for the Owens pupfish, Cyprinodon radiosus. U.S. Fish and Wildlife Service, Portland, OR. 47 pp.
U.S. Fish and Wildlife Service. 1993a. Endangered and threatened wildlife and plants. 50 CFR 17.11 & 17.12. Federal Register, August 23, 1993. U.S. Department of the Interior, Washington, DC. 40 pp.
Williams, J. E., D. W. Sada, C. D. Williams, and other members of the Western Division of Endangered Species Committee. 1988. American Fisheries Society guidelines for introductions of threatened and endangered fishes. Fisheries 13(5):5-11.
Revision Date: 5/7/2019
Peer Review Date: 9/22/1999
Fuller, P., 2020, Cyprinodon radiosus Miller, 1948: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=659, Revision Date: 5/7/2019, Peer Review Date: 9/22/1999, Access Date: 10/22/2020
This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.