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.

Agosia chrysogaster
Agosia chrysogaster
(Longfin Dace)
Native Transplant

Copyright Info
Agosia chrysogaster Girard, 1856

Common name: Longfin Dace

Taxonomy: available through www.itis.govITIS logo

Identification: Minckley (1973); Sublette et al. (1990); Page and Burr (1991). Another name is Rhinichthys chrysogaster, however ITIS does not recognize this as a synonym.

Size: 10 cm.

Native Range: Lower Colorado River drainage, New Mexico and Arizona, and south through southern Arizona and Pacific drainages of western Mexico (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 Agosia chrysogaster are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
AZ198019801Lake Mead
NM196519906Carrizo Wash; El Paso-Las Cruces; Mimbres; Rio Grande-Albuquerque; Rio Hondo; Zuni

Table last updated 6/15/2024

† Populations may not be currently present.

Means of Introduction: Unknown; probable bait bucket releases. Introduced as early as the 1950s into parts of the Rio Grande basin of New Mexico. The Rio Hondo, Mimbres, and Largo Creek introductions all occurred in the 1960s (Sublette et al. 1990).

Status: The Largo Creek population was extirpated by 1990, but the New Mexico populations in Rio Hondo and the Mimbres remain established (Sublette et al. 1990). It is locally established in a portion of the Rio Grande basin (Sublette et al. 1990). Reported but not known to be established in the Zuni River, New Mexico, and in the Virgin River, Arizona (Lee et al. 1980 et seq.). The status of the Virgin River population is unknown.

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: Koster (1957) reported that the species is used as a baitfish.

Other Resources:
FishBase Summary

Author: Leo Nico, and Pam Fuller

Revision Date: 3/1/2009

Peer Review Date: 3/1/2009

Citation Information:
Leo Nico, and Pam Fuller, 2024, Agosia chrysogaster Girard, 1856: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=639, Revision Date: 3/1/2009, Peer Review Date: 3/1/2009, Access Date: 6/15/2024

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 [6/15/2024].

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