Lake Chub - Couesius plumbeus
(see State Rank Reason below)
State Rank Reason (see State Rank above)
Currently ranked a S5 because it is common, widespread, and abundant (although it may be rare in parts of its range). Not vulnerable in most of its range.
The lake chub is a native minnow found in Montana's eastern and northern drainages. They are an indicator species of the core prairie fish assemblage found in the Perennial Prairie Stream Aquatic Ecological System. Lake chubs are usually 6 inches or less in length (can be confused with creek chubs in the southern part of their MT range), and are reported to be an important forage fish in some locations. Lake chubs generally prefer small, slow streams and have been illegally introduced in several mountain lakes.
Silver gray overall, dusky on back, underside whitish. A midside band is present but often indistinct. Scattered dark scales may be present, giving a speckled appearance. Breeding males develop reddish patches, particularly on the pectoral fin bases. A well-developed, rounded barbel is located slightly above each corner of the mouth.
Western Hemisphere Range
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Runs out of lakes up to a mile or more to spawn in streams.
Favors creek type habitat, mostly at lower elevations, and is rarely found in the larger streams. Also in some mountain lakes.
Feeds on plankton and small aquatic invertebrates
May cross with longnose dace. No hybrids reported in Montana.
Most are sexually mature at 3 yrs. Spawns mid May - mid June when water temps. reach 50 degrees F. No parental care. Eggs hatch in 10 days at 56 degrees F.
- Additional ReferencesLegend: View Online Publication
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- Clancey, C.G. 1978. The fish and aquatic invertebrates in Sarpy Creek, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 54 p.
- Gilham, A.T. 2016. Relationship between intensity of livestock grazing and trout biomass in headwaters of east front rocky mountain streams, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 45 p.
- Mullen, J.A. 2007. Spatiotemporal variation of fish assemblages in Montana prairie streams. M.Sc. Thesis. Bozeman, MT: Montana State University. 102 p.
- Mullins, M.S. 1991. Biology and predator use of cisco (Coregonus artedi) in Fort Peck Reservoir, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 68 p.
- Reinhart, D.P. 1990. Grizzly bear habitat use on cutthroat trout spawning streams in tributaries of Yellowstone Lake. M.Sc. Thesis. Bozeman, MT: Montana State University. 128 p.
- Sanborn, B.W. 1990. The ecology of Rainbow Trout in the Bighorn River, Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 63 p.
- Stash, S.W. 2001. Distribution, relative abundance, and habitat associations of Milk River fishes related to irrigation diversion dams. M.Sc. Thesis. Bozeman, MT: Montana State University. 82 p.
- Stringer, A.L. 2018. Status of Northern Pearl Dace and chrosomid dace in prairie streams of Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 150 p.
- Additional Sources of Information Related to "Fish"