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White Sucker

Catostomus commersonii

Species Overview

Physical Characteristics

Coloration: Back and sides are green-brown to black with a silver luster. Scales often outlined with dark pigment. Belly is silver-white. Dorsal and tail fins are clear or dusky while lower fins are white with orange or yellow tinges.

Breeding Males: During spawning season (April-May), males develop striking coloration with gold on the back, red or pink stripe along the sides, and small projections (tubercles) on the head, body, and fins. This transformation is spectacular and signals peak spawning activity.

Body Shape: Long, round-bodied fish with smooth, streamlined profile. Features a homocercal (symmetrical) tail, one dorsal fin with 9+ rays, and abdominal positioned pelvic fins.

Fishing Information

Size Range

10-16 inches

Peak Season

Spring, Summer, Fall, Winter (Ice Fishing)

Best Baits

Small Jigs Tiny Flies Small Spinners

Fishing Guide

Best Fishing Times:

Dawn, Morning, Afternoon, Dusk, Night
Peak Fishing Seasons:

Spring, Summer, Fall, Winter (Ice Fishing)
Recommended Lures:

Small Jigs Tiny Flies Small Spinners
Abundance in Chain:

Abundant
Fighting Quality:

Excellent Fighter

Habitat & Behavior

White Suckers are highly adaptable and found statewide in Illinois, including throughout the Fox Chain O’Lakes system. They inhabit creeks, small rivers, and lakes, preferring areas near the bottom where they swim in schools. These fish are bottom-dwellers that feed along substrate surfaces.

Preferred Areas in Fox Chain

Water Type: Lakes, rivers, streams, and connecting channels

Bottom Type: Gravel, rock, sand, and mud bottoms

Depth Range: 2-15 feet (vary by season)

Cover: Moderate vegetation, rocky areas, current breaks

Water Clarity: Highly tolerant of turbid (murky) water

Temperature Tolerance: Cool to warm water (highly adaptable)

Spawning Season & Behavior

Spectacular spring spawning occurs in April-May in shallow gravel areas. Males develop bright breeding colors (gold back, pink/red stripes). Multiple males (2-3) gather with single females. Females release up to 10,000 eggs fertilized by attending males. Adults clean gravel bottom, bury eggs, which hatch in 18-20 days.

Conservation Status

Status: Secure and abundant — one of the most common native freshwater fish across their range

Population Health: Healthy self-sustaining populations in the Fox Chain O’Lakes with strong natural reproduction. Found in virtually every lake and connecting waterway.

Ecological Importance: Critical forage species supporting populations of pike, bass, walleye, and other predators. Spring spawning runs provide essential energy transfer to aquatic and terrestrial ecosystems. Bottom-feeding behavior helps process sediments and recycle nutrients.

Management: No size limits, no bag limits. Commercial harvest permitted in Illinois. Populations are self-sustaining without stocking.

Resilience: Highly tolerant of habitat degradation, pollution, and environmental stress. Their adaptability ensures stable populations even during challenging water quality conditions in the Chain.

Fishing Techniques

Bottom Fishing (Most Effective):

Use light to medium-light action rod (7 feet)
6-10 lb monofilament or light braid
Fish finder rig with low-profile sinker (pencil or disc weight, 1/4 to 1.5 oz)
Size 4-8 circle hook
8-12 lb fluorocarbon leader (12 inches)
Cast upstream, let sinker settle, keep line tight, wait for bite

Sight Fishing (Spring Spawning):

Polarized sunglasses essential
Stay far back from water (suckers spook easily)
Long cast upstream of visible fish
Watch sucker “sniff” along bottom until it finds bait
Circle hooks set themselves – just lift when line moves

Float Fishing:

Use slip bobber in current areas
Adjust depth to keep bait near bottom
Effective in channels between lakes

Best Locations in Fox Chain:

Fox River where it enters/exits Grass Lake
Channels connecting individual lakes
Rocky areas in Channel Lake and Lake Catherine
Gravel areas in Petite and Bluff Lakes

Spring spawning: Shallow tributary streams

Current Regulations

Daily Limit:

No Limit
Minimum Length:

No Limit
Special Rules:
- Fox Waterway Agency requires annual user fee/sticker for watercraft
- All general Illinois fishing regulations in effect
- Trotline fishing permitted in Fox Chain system
- No special spawning closures for suckers