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.

Catostomus latipinnis
(Flannelmouth Sucker)
Native Transplant
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Catostomus latipinnis Baird and Girard, 1853

Common name: Flannelmouth Sucker

Taxonomy: available through www.itis.govITIS logo

Native Range: Upper and lower Colorado River basin in Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming (Bezzerides and Bestgen 2002). More common in upper Colorado basin, and historically rare in lower Colorado River (Mueller and Wydoski 2004).

US auto-generated map Legend USGS Logo
Alaska auto-generated map
Hawaii auto-generated map
Caribbean auto-generated map
Puerto Rico &
Virgin Islands
Guam auto-generated map
Guam Saipan
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 Catostomus latipinnis are found here.

StateYear of earliest observationYear of last observationTotal HUCs with observations†HUCs with observations†
Utah195019501Upper Virgin

Table last updated 10/4/2018

† Populations may not be currently present.

Ecology: Flannelmouth Suckers are generally found in pools and deep runs of medium to large rivers within the Colorado River basin, with young fish found in aread of slower water velocity than adults (Bezzerides and Bestgen 2002).

Means of Introduction: Introduced in Utah as discarded bait (Miller 1952). Introduced to lower Colorado River by Arizona Game and Fish Department for black fly abatement (Mueller and Wydoski 2004).

Status: Established.

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: Abundance and distribution of Flannelmouth Suckers in the Colorado River basin have been greatly reduced from their historical distribution.  Only occurs in 25% of historical habitat in lower Colorado River basin. Extirpated from the Gila River basin, and the majority of the mainstem lower Colorado River below the Grand Canyon. Occupies 50% of historical distribution in upper Colorado River basin (Bezzerides and Bestgen 2002).

The species was translocated to the lower Colorado River near Bullhead City, Arizona, in 1976 (Mueller and Wydoski 2004), as a reintroduction effort (Minkley and Marsh 2009).

References: (click for full references)

Bezzerides, N., and K. Bestgen. 2002. Status review of roundtail chub Gila robusta, flannelmouth sucker Catostomus litipinnis and bluehead sucker Catostomus discobolus in the Colorado River basin. Final report submitted to the U.S. Department of Interior, Bureau of Reclamation Division of Planning. 139 pp.

Minckley, W.L. and P.C. Marsh. 2009. Inland fishes of the greater Southwest. University of Arizona Press, Tucson.

Miller, R.R. 1952. Bait fishes of the lower Colorado River, from Lake Mead, Nevada, to Yuma, Arizona, with a key for identification. California Fish and Game 38:7-42.

Mueller, G.A., and R. Wydoski. 2004. Reintroduction of the flannelmouth sucker in the lower Colorado River. North American Journal of Fisheries Management 24:41-46.

Other Resources:
FishBase Summary

Author: Pam Fuller, and Matt Neilson

Revision Date: 3/26/2014

Peer Review Date: 4/1/2016

Citation Information:
Pam Fuller, and Matt Neilson, 2018, Catostomus latipinnis Baird and Girard, 1853: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=348, Revision Date: 3/26/2014, Peer Review Date: 4/1/2016, Access Date: 10/17/2018

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.

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URL: https://nas.er.usgs.gov
Page Contact Information: Pam Fuller - NAS Program (pfuller@usgs.gov)
Page Last Modified: Tuesday, October 02, 2018


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. [2018]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [10/17/2018].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted. For queries involving fish, please contact Pam Fuller. For queries involving invertebrates, contact Amy Benson.