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Rock Bass

Rock Bass

Rock Bass in Iowa are stout, heavy-bodied sunfish with distinctive large mouths extending beyond mid-eye when closed, bright red eyes (earning the nickname 'redeyes'), and six anal fin spines that distinguish them from other sunfish.

Scientific Name: Ambloplites rupestris

Also known as redeyes

Physical Characteristics:
  • They have olive bodies with brassy reflections, dark mottlings along the sides, and horizontal lines of spots.
  • Iowa's state record Rock Bass measured 10.5 inches, caught in 1973.
  • They grow 1.5-2 inches in their first year, reaching 5-7 inches after three years, with most seldom exceeding 10 inches.

What to know

Habitat Distribution

  • Rock Bass in Iowa are limited to clearer, rocky habitats primarily in interior streams of northeast Iowa, with populations occasionally found in the upper parts of the Des Moines and Mississippi rivers and large natural lakes.

Key Locations

  • northeast Iowa's clear, rocky streams including the Turkey River above and below Clermont, Volga River, Upper Iowa River sections, Maquoketa River above Monticello, Cedar River above Nashua, and Wapsipinicon River from Troy Mills to Oxford Junction.
  • Small impoundments like Elkader, Waucoma, and Vernon Springs also hold populations.

Specific Spots

  • rocky, vegetated stream pools, close to rocks near current, around submerged structure.

Rock Bass FAQ

Answers from onWater's species guide.

What are the best lures and bait for Rock Bass in Iowa?

natural baits like nightcrawlers, live crayfish, minnows, and small pieces of crawler. For artificial lures, try small jigs, spinners, and crankbaits that match the size of natural baitfish. In clearer water, use natural colors and smaller profile lures; in stained water, choose brighter colors with more vibration.

When is the best time to fish for Rock Bass in Iowa?

Rock Bass fishing in Iowa is best from late spring through fall, avoiding the May-June spawning period when males are guarding nests.

How do you catch Rock Bass in Iowa?

Use natural baits like nightcrawlers, keeping them active and moving since Rock Bass rarely search for dead food on bottom. Rock Bass respond to vertical jigging around submerged structure.

What do Rock Bass eat?

They're omnivorous predators feeding on aquatic insects, minnows, small fish (including their own young), crayfish, and various aquatic invertebrates, with peak feeding occurring in early morning and evening hours.

Where do Rock Bass live in Iowa?

Rock Bass in Iowa are limited to clearer, rocky habitats primarily in interior streams of northeast Iowa, with populations occasionally found in the upper parts of the Des Moines and Mississippi rivers and large natural lakes.

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