Common name: Lahontan Redside
Synonyms and Other Names: Lahontan redside shiner
available through www.itis.gov
Identification: La Rivers (1962); Moyle (1976a); Page and Burr (1991). It should be noted that its congener, Richardsonius balteatus, is called the redside shiner.
Size: 17 cm.
Native Range: Lahontan and other interior basins in northern and western Nevada, and northern California, including Humboldt, Walker, Carson, Truckee, Susan, Quinn, and Reese River systems; Walker, Tahoe, and Pyramid lakes (Page and Burr 1991).
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 Richardsonius egregius are found here.
Table last updated 2/27/2023
† Populations may not be currently present.
Means of Introduction: The species was stocked in Nye County, Nevada, in 1956 and 1957, and into Weber Lake, California (La Rivers 1962); the specific reasons for these introductions were not given. This species and Rhinichthys osculus robustus were introduced to Ruby Lake, Nevada, from a headwater of the Humboldt River, presumably to serve as forage for introduced largemouth bass (Hubbs et al. 1974). Most other records may have been the result of bait bucket releases (Kimsey 1950; Moyle 1976a) although Kimsey (1950) also argued that its occurrence in Miller Lake, California, a site near the Lahontan system, was possibly the result of a natural stream capture event.
Status: Established in California (Moyle 1976a); reported, possibly established, in Nevada (Deacon and Williams 1984). The Ruby Lake population apparently did not survive (Hubbs et al. 1974).
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.
Leo Nico, and Pam Fuller
Revision Date: 12/5/2003
Peer Review Date: 12/5/2003
Leo Nico, and Pam Fuller, 2023, Richardsonius egregius (Girard, 1858): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=647, Revision Date: 12/5/2003, Peer Review Date: 12/5/2003, Access Date: 4/1/2023
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.