Common name: Lake Chub
available through www.itis.gov
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).
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 Couesius plumbeus are found here.
Table last updated 9/30/2019
† Populations may not be currently present.
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: 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.
References: (click for full references)
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.
Pam Fuller, and Leo Nico
Revision Date: 3/27/2014
Peer Review Date: 3/27/2014
Pam Fuller, and Leo Nico, 2020, Couesius plumbeus (Agassiz, 1850): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=513, Revision Date: 3/27/2014, Peer Review Date: 3/27/2014, Access Date: 2/20/2020
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.