The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

Richardsonius egregius
Richardsonius egregius
(Lahontan Redside)
Native Transplant

Copyright Info
Richardsonius egregius (Girard, 1858)

Common name: Lahontan Redside

Synonyms and Other Names: Lahontan redside shiner

Taxonomy: available through www.itis.govITIS logo

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).

Native range data for this species provided in part by NatureServe NS logo
Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences:

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.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
CA194819767Honey-Eagle Lakes; North Fork Feather; Sacramento Headwaters; South Fork American; Truckee; Upper Sacramento; Upper Yuba
NV195619571Hot Creek-Railroad Valleys

Table last updated 6/23/2024

† 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.

Remarks: Although Wydoski and Whitney (1979) reported the Lahontan Redside as introduced into the Bonneville basin, Idaho, we found no substantiating evidence to support this. Simpson and Wallace (1978), Lee et al. (1980 et seq.), Sigler and Sigler (1987), and Page and Burr (1991) make no mention of such an introduction. Because of several other errors in the same table, we chose not to include this record.

Other Resources:
FishBase Summary

Author: Leo Nico, and Pam Fuller

Revision Date: 12/5/2003

Peer Review Date: 12/5/2003

Citation Information:
Leo Nico, and Pam Fuller, 2024, 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: 6/23/2024

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.


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [6/23/2024].

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