Mountain Sucker - Catostomus platyrhynchus
Mountain Sucker Color Plate - Mountain Sucker Color Plate
Global Rank:
G5
State Rank:
S5
Agency Status
USFWS:
none
USFS:
none
BLM:
none
CFWCS Tier:
3
General Description
The mountain sucker has a more limited habitat than other Montana suckers. It is virtually limited to running waters east of the Divide. It also is the smallest sucker in Montana with its largest specimens having a length of about 9 inches.
Diagnostic Characteristics
Back and upper sides are dusky or dark green with black specks; may have dark mottling shaped like saddles across the back; lower body whitish. Both sexes have a reddish orange band along sides during breeding season; band is brighter, longer, and wider in male. Mouth is so long it sometimes exceeds head width. See Snyder and Muth (1990) for a guide to the identification of larvae and early juveniles. No other Montana sucker has a notch in each corner of mouth.
Distribution
Montana Range
Habitat
Cold, clear streams with rubble, gravel or sand bottoms; sometimes turbid streams but seldom lakes. Found principally in riffle habitat in middle Missouri River study.
Food Habits
Mostly diatoms but other algae and higher aquatic plants and invertebrates are also used.
Ecology
Young prefer slower side channels or weedy backwaters. Seldom exceed 6 inches in length as adults.
Reproductive Characteristics
Sexually mature : males in 2 -3 yrs., females in 4 years. Spawns June - July when water temperatures exceed 50 degrees F. Incubation period probably short.
Citations & Sources
- Holton, G. D. 2003. A field guide to Montana fishes. Mont. Dept. Fish, Wildl. Parks, 95 pp.