Common name: Bigmouth Shiner
available through www.itis.gov
Identification: Three subspecies: N. d. piptolepis, N. d. keimi, and N. d. dorsalis (Page and Burr 1991). Becker (1983); Smith (1985); Page and Burr (1991); Etnier and Starnes (1993).
Size: 8 cm.
Native Range: Great Lakes, Hudson Bay (Red River), and Mississippi River basins from northern Michigan to southern Manitoba, and from eastern Illinois to the Platte River system, eastern Wyoming and northern Colorado; disjunct populations in western New York and Pennsylvania, northern West Virginia, northern Ohio, and western Michigan (Page and Burr 1991). Notropis d. piptolepis is native to the Platte River system in Wyoming and Colorado; N. d. keimi is native to Lake Ontario and Allegheny River drainages in New York and Pennsylvania; and N. d. dorsalis is throughout the rest of the range (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 Notropis dorsalis are found here.
Table last updated 9/30/2019
† Populations may not be currently present.
Means of Introduction: Means of introduction into the Arkansas River is not known with certainty, may have been natural or the result of an introduction. Miller (1983) hypothesized that the population found in Monument Creek (Arkansas River drainage) in Colorado may have resulted by way of a bait-bucket transfer from the range of the western subspecies. Becker (1983) speculated that the introduction into the upper Wolf River of Wisconsin was likely due to a bait release since it is unlikely that this minnow could move over the dam at Shawano. He also concluded that recent collections in the Root and Pike river systems are more likely to have resulted from bait bucket releases than by fish crossing the low divide between the headwaters of the Root and Des Plaines rivers. Becker also made reference to the possible passage of this species into the Fox-Wolf system through the connection at Portage. The author was apparently making reference to the Wisconsin-Fox Canal which connects the Wisconsin River to the Lake Michigan drainage, although he apparently did not rule out an earlier, natural connection, that may have existed.
Status: Presumably established in the Arkansas River drainage of Colorado (see Woodling 1985). Established in the upper Wolf watershed of Wisconsin; reported from other localities in Wisconsin outside its native range (Becker 1983).
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.
Leo Nico, and Pam Fuller
Revision Date: 3/4/2015
Peer Review Date: 4/1/2016
Leo Nico, and Pam Fuller, 2019, Notropis dorsalis (Agassiz, 1854): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=593, Revision Date: 3/4/2015, Peer Review Date: 4/1/2016, Access Date: 11/20/2019
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.