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| NAS - Nonindigenous Aquatic Species |
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Common Name: lake chub
Taxonomy: available through 
Identification: Scott and Crossman (1973); Becker (1983); Page and Burr (1991). Gilbert (1998) recognized three distinct subspecies: C. p. plumbeus, C. p. greeni, and one formerly known as C. p. dissimilis (a name no longer available).
Size: 23 cm.
Native Range: Throughout much of Canada and northern United States; south to Delaware
River, New York; southern end of Lake Michigan, Illinois; Platte River
system, Colorado; and Columbia River drainage, Washington. Relict
populations in Mississippi River basin, Iowa (Page and Burr 1991).
Nonindigenous Occurrences: This species is known from the Big and Little Sandy creeks, Green River drainage (Colorado River basin), and Yellowstone Lake, upper Colorado drainage, and Yellowstone National Park , Wyoming (Baxter and Simon 1970; C. Wheeler, personal communication; Lee et al. et seq 1980; Hubert 1994; Tilmant 1999).
Means of Introduction: Probably introduced by bait bucket release (Baxter and Simon 1970).
Status: Established in the Green River drainage and in Yellowstone Lake, Wyoming (Baxter and Simon 1970).
Impact of Introduction: Unknown.
Remarks: Wydoski and Whitney (1979) stated the species is not native to Idaho
and that it has been introduced into the panhandle region, however,
Simpson and Wallace (1978), Lee et al. (1980 et seq.), and Page and
Burr (1991) depicted the species' range to include northern Idaho and
made no mention of it being introduced there. We believe it is probably
native to the Kootenai drainage in northern Idaho. According to C.
Gilbert (personal communication), its occurrence in the upper Colorado
basin may have involved an introduction; however, he also noted that
the species may have entered the Colorado basin by way of a localized
stream capture involving a tributary of the Colorado and the upper
Platte River. Gilbert (1998) discussed the distribution of this species
in his account of Ceratichthys squamilentus.
Voucher specimens: Wyoming (currently in C. Wheeler's possession but will be placed in the UWL museum).
Hubert, W. 1994. Exotic fishes, p 158-174 in T.L. Parish and S.H. Anderson (eds). Exotic Species Manual. Wyoming Game and Fish Department, Laramie.
Tilmant, J.T. 1999. Management of nonindigenous aquatic fish in the U.S. National Park System. National Park Service. 50 pp.
Other Resources:
FishBase Fact Sheet
Author: Pam Fuller and Leo Nico
Revision Date: 8/4/2004 Citation for this information:
Pam Fuller and Leo Nico. 2009. Couesius plumbeus. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=513> Revision Date: 8/4/2004
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