Skip to main content

The IDNR headquarters at 1 Natural Resources Way in Springfield has experienced a power outage and tree damage throughout the grounds as a result of severe storms in the area. The agency expects to reopen the building to the public on Monday, June 15, 2026, though this could be subject to change. Check back here for an update before planning to visit the office in person.

Governor JB Pritzker Illinois.gov Contact IDNR DNR A to Z

mud darter

mud darter (Etheostoma asprigene) [female]
Illinois Status: common, native
Photo © Lance Merry

mud darter (Etheostoma asprigene) [male]
Illinois Status: common, native
Photo © Lance Merry

Features and Behaviors

FEATURES
The mud darter may attain a length of one and one-half to slightly over two inches. The male has dark blue bars on the rear half of the body with orange between them. Scales are present on the cheeks and gill cover. The first dorsal fin is patterned with blue at the base, red in the center and blue at the outer edge with a black blotch at the rear. The second dorsal and tail fins have light brown bands. Six to 10 dark saddles cross the brown back. The belly is white to orange. A large, dark “teardrop” mark can be seen under the eye and a dark mark from eye to snout is also present. The lateral line is incomplete. The breeding male has alternating red and blue-green bars on the sides. This fish has a life span of about three years.

BEHAVIORS
The mud darter may be found statewide in Illinois. This fish lives in ditches, rivers and lowland lakes along rivers particularly in areas with sand, gravel and hard substrates that are layered with dead organic material. The mud darter spawns in spring. Eggs are deposited over debris or plants. This fish eats small crustaceans and other invertebrates.

Illinois Range

Taxonomy

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Percidae

Habitats

Aquatic
bottomland forests

Woodland
bottomland forests; southern Illinois lowlands