Largescale Sucker - Catostomus macrocheilus
The largescale sucker is native to Montanas western drainage. Like the previously mentioned suckers, it is present in both rivers and lakes. In Montana, the maximum size in this species is usually less than 5 pounds. The food habits of largescale suckers are similar to those of other suckers.
Back and sides dark olive gray, changing abruptly to white or yellowish on underside. Dorsal fin usually has 13 to 15 rays, its base is long. Scales are medium sized, 62 to 80 in lateral line.
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
Upstream migration accompanies spawning.
Found in both streams and lakes. Spawns in gravel riffles with strong current or along lake margins (Brown 1971, Huston et al. 1984, Weisel 1957).
Eats almost any available organism found on the substrate (Brown 1971).
Have decreased in abundance below Libby dam due to colder water temperatures delaying spawning (May and Huston 1979). Young rear in quiet backwaters or lakes.
Sexually mature in 4-5 years - some males in 3 years. Spawns April - May. No parental care. Eggs stick to bottom and hatch in 2 weeks (Brown 1971).
- Literature Cited AboveLegend: View Online Publication
- Brown, C.J.D. 1971. Fishes of Montana. Montana State University, Bozeman, MT. 207 pp.
- Huston J.E., P. Hamlin; B. May 1937-; Montana. Dept. of Fish, Wildlife, and Parks.; United States. Army. Corps of Engineers. Seattle District. 1984
- May, B.E. and J.E. Huston. 1979. Status of fish populations in the Kootenai River below Libby dam. Montana Department of Fish, Wildlife, and Parks. 57 pp.
- Weisel, G.F. 1957. Fish guide for intermountain Montana. Montana State University Press. Missoula, MT. 88 pp.
- Additional ReferencesLegend: View Online Publication
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- Nelson, M.L. 1999. Evaluation of the potential for resident bull trout to reestablish the migratory life-form. M.Sc. Thesis. Bozeman, MT: Montana State University. 72 p.
- Rahrer, J.F. 1963. Age and growth of four species of fish, Flathead Lake, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 16 p.
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