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Blue Sucker

Blue Sucker

The Blue Sucker is a distinctive native Illinois fish found exclusively in the Mississippi, Ohio, and Wabash rivers.

These are highly mobile bottom-feeders that are considered uncommon due to habitat fragmentation from navigation dams that have restricted their historic spring and fall upstream migrations.

Scientific Name: Cycleptus elongatus

Physical Characteristics:
  • Elongated fish reach 16-24 inches in length with a small, slender head that tapers to a blunt, overhanging snout.
  • They have thick, papillae-covered lips, a deeply forked tail, and a characteristic long, sickle-shaped dorsal fin.
  • Coloration varies dramatically from light steel-gray to jet black, with breeding males becoming blue-black and developing white tubercles on their head, body, and fins during spawning season.

What to know

Habitat Distribution

  • Found exclusively in the Mississippi, Ohio, and Wabash rivers in Illinois.
  • They prefer the thalweg (deepest channel) of large river systems where heavy current concentrates food sources.

Key Locations

  • Mississippi, Ohio, and Wabash rivers.
  • Wing dams on the Mississippi River and woody snags in the St.
  • Croix River where they're known to concentrate.

Specific Spots

  • Deep, fast-flowing sections with gravel, rock, or sand bottoms - never silty areas.
  • Main river channels in areas of strongest current over hard bottoms.
  • Areas of strong current over rock, sand, and gravel substrates in main river channels.

Blue Sucker FAQ

Answers from onWater's species guide.

What are the best lures and bait for Blue Sucker in Illinois?

Small jigs tipped with worms, crayfish, or aquatic insect imitations could be effective given their diet of aquatic insects, insect larvae, and crustaceans.

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

Spring offers the best opportunity when fish move into shallower areas for spawning. Spawning occurs in spring when water temperatures reach 53-62°F.

How do you catch Blue Sucker in Illinois?

Present baits or lures near the bottom in heavy current. Since Blue Suckers are bottom-feeders waiting for current to bring food to them, focus on getting offerings into the fast, deep water where these fish live.

What do Blue Sucker eat?

Their diet consists primarily of aquatic insects, insect larvae, crustaceans, plant material, and algae obtained from the river bottom.

Where do Blue Sucker live in Illinois?

Found exclusively in the Mississippi, Ohio, and Wabash rivers in Illinois. They prefer the thalweg (deepest channel) of large river systems where heavy current concentrates food sources.

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