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.

Gila coerulea
Gila coerulea
(Blue Chub)
Native Transplant

Copyright Info
Gila coerulea (Girard, 1856)

Common name: Blue Chub

Taxonomy: available through www.itis.govITIS logo

Identification: Moyle (1976a); Page and Burr (1991); Bond (1994).

Size: 41 cm.

Native Range: Klamath and Lost River systems of Oregon and California (Lee et al. 1980 et seq.; Page and Burr 1991).
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 Gila coerulea are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
OR192519982Little Deschutes; North Umpqua

Table last updated 7/23/2024

† Populations may not be currently present.

Means of Introduction: Unknown. According to Logan (personal communication), Oregon introductions took place during the 1920s.

Status: Introductions into Paulina and East lakes in Oregon were unsuccessful (Logan, personal communication). Status of Diamond Lake introduction 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: Lee et al. (1980 et seq.) noted that it had been introduced outside its native range, but nonindigenous sites apparently were not mapped. McPhail and Lindsey (1986) listed it as introduced to the Middle Columbia drainage, but did not provide details. Paulina and East lakes are calderas and both are within the same crater, a remnant of Mt. Newberry. According to Logan (personal communication), neither lake had naturally occurring fish, though a few salmonid species have been successfully introduced. East Lake does not have an outlet, but Paulina Lake does have an outlet (Paulina Creek) which is in the Deschutes-Columbia River drainage.

Other Resources:
FishBase Summary

Author: Fuller, P.

Revision Date: 12/2/1999

Peer Review Date: 12/2/1999

Citation Information:
Fuller, P., 2024, Gila coerulea (Girard, 1856): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=538, Revision Date: 12/2/1999, Peer Review Date: 12/2/1999, Access Date: 7/23/2024

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 [7/23/2024].

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