Bigmouth Buffalo

Bigmouth Buffalo are the largest members of the sucker family and North America's longest-living freshwater fish, capable of living over 127 years.
While not native to Wyoming, they inhabit the Missouri River drainage system along Wyoming's eastern border, particularly in Montana reservoirs that extend into Wyoming waters.
Scientific Name: Ictiobus cyprinellus
- These remarkable fish are filter feeders with a terminal, forward-facing mouth that sets them apart from other sucker species.
Fishing in Wyoming
What to know
Habitat Distribution
- Bigmouth Buffalo prefer slow-moving waters in large rivers, backwaters, oxbows, lakes, and reservoirs with depths less than 16 feet.
Key Locations
- Missouri River drainage system along Wyoming's eastern border, particularly in Montana reservoirs that extend into Wyoming waters.
Specific Spots
- Target slow-moving backwaters, oxbows, and deeper pools of large rivers, particularly areas with muddy or silty bottoms rich in organic matter.
Bigmouth Buffalo FAQ
Answers from onWater's species guide.
What are the best lures and bait for Bigmouth Buffalo in Wyoming?
For bait fishing, use bread or dough balls, small pieces of corn, or scented baits positioned near the bottom, as they rarely take live bait. Small jigs can be effective in murky water where visibility is low.
What flies work for Bigmouth Buffalo in Wyoming?
Fly fishing requires small nymph patterns, particularly midge patterns and small streamers that mimic their zooplankton prey - use sizes 8-10 in brown and olive colors, or white with olive-bronze backs for streamers.
When is the best time to fish for Bigmouth Buffalo in Wyoming?
The best fishing occurs from late summer through fall when they're actively feeding, avoiding their vulnerable spring spawning period (April-June).
How do you catch Bigmouth Buffalo in Wyoming?
Still fishing and drift fishing are the most productive techniques, with flies and lures fished near the bottom in areas with current breaks or structure. Present flies with a dead drift technique similar to trout nymphing, or use the quarter-cast downstream method with slow retrieves.
What do Bigmouth Buffalo eat?
They primarily consume zooplankton, small crustaceans (particularly cladocerans and copepods), chironomids, algae, and detritus. Unlike other buffalo species, they're pelagic feeders that strain plankton from the water column using fine gill rakers.
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