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.

Semotilus atromaculatus
Semotilus atromaculatus
(Creek Chub)
Native Transplant

Copyright Info
Semotilus atromaculatus (Mitchill, 1818)

Common name: Creek Chub

Taxonomy: available through www.itis.govITIS logo

Identification: Becker (1983); Page and Burr (1991); Etnier and Starnes (1993); Jenkins and Burkhead (1994).

Size: 30 cm.

Native Range: Most of eastern United States and southeastern Canada in Atlantic, Great Lakes, Hudson Bay, Mississippi, and Gulf basins as far west as Manitoba, eastern Montana, Wyoming, Colorado, eastern Oklahoma, and eastern Texas, but absent from southern Georgia and peninsular Florida; isolated population in upper Pecos and Canadian River systems, New 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 Semotilus atromaculatus are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
AL1929198810Lower Chattahoochee; Lower Choctawhatchee; Lower Conecuh; Middle Tallapoosa; Patsaliga; Pea; Sepulga; Upper Choctawhatchee; Upper Conecuh; Yellow
CO1938199410Big Sandy; Clear; Colorado Headwaters; Colorado Headwaters-Plateau; Lower Green-Diamond; Lower Yampa; Roaring Fork; Upper Green-Flaming Gorge Reservoir; Upper Yampa; White - Yampa
FL195919967Apalachicola; Apalachicola Bay; Blackwater; Choctawhatchee Bay; Escambia; Lower Choctawhatchee; Yellow
GA193919665Apalachicola; Ichawaynochaway; Kinchafoonee-Muckalee; Lower Oconee; Middle Flint
KS197220113Coon-Pickerel; Upper Cimarron-Bluff; Upper Verdigris
ME195719992Maine Coastal; Piscataqua-Salmon Falls
NH196519651Merrimack River
NJ186020002Cohansey-Maurice; Mullica-Toms
NM1926201311Canadian Headwaters; Cimarron; Cimarron Headwaters; Conchas; Mora; Pecos Headwaters; Rio Penasco; Upper Canadian; Upper Pecos; Upper Rio Grande; Ute
NC194719972Middle Neuse; Pamlico Sound
OK194920115Bird; Black Bear-Red Rock; Blue; Lake Texoma; Muddy Boggy
SC193319994Calibogue Sound-Wright River; Cooper; Little Pee Dee; Salkehatchie
TX196019913Lower Trinity-Tehuacana; Upper Salt Fork Red; Upper Trinity
UT196919995Lower Green; Lower Green-Diamond; Lower Weber; Upper Green-Flaming Gorge Reservoir; Utah Lake
VT201920202Lamoille River; Otter Creek
VA194519451Middle New
WY197020109Big Sandy; Great Divide Closed Basin; Little Snake; Little Wind; Muddy; New Fork; Popo Agie; Upper Green; White - Yampa

Table last updated 4/13/2024

† Populations may not be currently present.

Means of Introduction: Most introductions probably via bait bucket release. Woodling (1985) stated that the Colorado West Slope populations are the result of accidental introduction by man. Hubbs (1957) stated that western records in Texas, and a report from Lake Texoma "have undoubtedly resulted from bait release."

Status: Introduced populations are established in Colorado and Wyoming; probably established in Utah. The species has been present in the Snake River, Green River drainage, since at least the 1940s, but never in abundance (Holden and Stalnaker 1975). Status unknown in Texas.

Impact of Introduction: According to Baxter and Simon (1970), in some situations populations of this species may compete with trout, but the authors did not give details. Beckman (1974) reported that Creek Chub prey on trout. Magnan and Fitzgerald (1984) provided evidence that introduced Creek Chub are a potential competitor with brook charr Salvelinus fontinalis. In their study of a Quebec stream, they found that charr changed their diet from benthic invertebrates to zooplankton in the presence of chub. Subsequent laboratory experiments suggested that higher relative abundance of Creek Chub was one of several important factors in the observed niche shift of brook charr in nature (Magnan and Fitzgerald 1984). Competition with and predation by nonnative species (i.e., Catostomus sp., Creek Chub Semotilus atromaculatus, redside shiner Richardsonius balteatus, burbot Lota lota, brown trout Salmo trutta, and lake trout Salvelinus namaycush) limit populations of the rare bluehead sucker Catostomus discobolus (Wyoming Game and Fish Department 2010).

Remarks: This species is a commonly used baitfish (Baxter and Simon 1970; Scott and Crossman 1973; Beckman 1974). Tyus et al. (1982) gave a distribution map of the this species in the upper Colorado basin.

References: (click for full references)

Baxter, G.T., and J.R. Simon. 1970. Wyoming fishes. Bulletin No. 4. Wyoming Game and Fish Department, Cheyenne, WY.

Beckman, W.C. 1974. Guide to the fishes of Colorado. University of Colorado Museum, Boulder, Colorado.

Magnan, P., and G.J. Fitzgerald. 1984. Mechanisms responsible for the niche shift of brook char, Salvelinus fontinalis Mitchill, when living sympatrically with creek chub, Semotilus atromaculatus Mitchill. Canadian Journal of Zoology 62:1543-1555.

Tilmant, J.T. 1999. Management of nonindigenous aquatic fish in the U.S. National Park System. National Park Service. 50 pp.


Other Resources:
FishBase Summary

Author: Leo Nico, and Pam Fuller

Revision Date: 3/7/2011

Peer Review Date: 3/7/2011

Citation Information:
Leo Nico, and Pam Fuller, 2024, Semotilus atromaculatus (Mitchill, 1818): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=649, Revision Date: 3/7/2011, Peer Review Date: 3/7/2011, Access Date: 4/13/2024

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 [4/13/2024].

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 general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.