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Blue Sucker

Blue Sucker

The Blue Sucker is a distinctive native species found in eastern Montana's larger river systems. Montana has some of the finest Blue Sucker habitat in their entire range, making the state's populations significant to the overall gene pool.

The species serves as an indicator of ecosystem health due to its specific habitat requirements.

Scientific Name: Cycleptus elongatus

Physical Characteristics:
  • This species is easily recognized by its elongated body shape, distinctive sickle-shaped dorsal fin, and slate-blue to dark olive coloration with a white underside.
  • Montana Blue Suckers are typically large fish, averaging 60-75 centimeters in length and weighing 3-5 kilograms, with the largest recorded specimen exceeding 10 pounds.

What to know

Habitat Distribution

  • Found in eastern Montana's larger river systems.
  • Blue Suckers are adapted for life in swift currents and prefer waters with low turbidity and strong flow over cobble substrates.

Key Locations

  • Missouri River (as far upstream as Morony Dam near Great Falls), Yellowstone River (upstream of Forsyth), Missouri River from Great Falls downstream, Yellowstone River system, Tongue River, Marias River, Milk River, Teton rivers.
  • The Milk River system, particularly near its confluence with the Missouri, has been noted as supporting spawning populations.

Specific Spots

  • Target areas with swift current over cobble bottoms, particularly areas with strong current breaking over large cobbles and boulders, typically 2-6 feet deep.
  • These fish prefer the main channel swift water habitats rather than backwaters or slow pools.
  • Target tributary mouths during non-spawning periods.

Blue Sucker FAQ

Answers from onWater's species guide.

When is the best time to fish for Blue Sucker in Montana?

The best fishing occurs outside of their April-June spawning period. Spawning occurs from April to June at water temperatures around 50°F, during which time these fish should not be targeted.

How do you catch Blue Sucker in Montana?

When targeting them specifically, use bottom-fishing techniques. Use weighted nymphs or small bottom rigs with worms, as Blue Suckers occasionally grab these presentations while feeding on aquatic insects.

What do Blue Sucker eat?

They feed mainly on aquatic insects found in cobble areas, making them bottom feeders that use their specialized suction-cup mouths to vacuum up prey.

Where do Blue Sucker live in Montana?

Found in eastern Montana's larger river systems. Blue Suckers are adapted for life in swift currents and prefer waters with low turbidity and strong flow over cobble substrates.

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