Field Guide

The alligator gar is Missouri's largest gar and has a distinctively short, broad snout. Populations are declining. This fish once occurred in the Mississippi River at least as far upstream as the mouth of the Illinois River and in major tributaries.

The smallmouth buffalo is nearly as common and widespread in Missouri as the bigmouth buffalo. Identify it by its small, nearly horizontal mouth and the strongly keeled forward part of its back.

Compared to Missouri’s other buffalofishes, the black buffalo is less abundant and widespread, and of the three, it occurs most often in places with strong currents.

Like our other carpsuckers, the quillback has a deep, rather thick body and a long, sickle-shaped dorsal fin. This silvery, hump-backed fish is widely distributed in Missouri.

The shorthead redhorse is the most widely distributed redhorse sucker in Missouri, occurring nearly statewide. No other Missouri redhorse is as adaptable in its habitat requirements. Many specimens have a pea-shaped swelling on the upper lip.

The brindled madtom inhabits many of the same lowland streams and ditches as the tadpole madtom, and is nearly as common. Brindled madtoms are more often found in pools, however. The species also inhabits the Spring River system in southwest Missouri.

The freckled madtom looks similar to the tadpole madtom and shares much of its range, but its upper jaw projects beyond the lower jaw, and the underside of the head and body are sprinkled with dark speckles.

The tadpole madtom occurs in the Bootheel lowlands and in a broad zone from southwest Missouri to northeast Missouri. This small, chubby catfish is most common in the Bootheel lowlands and in northeastern Missouri.

Darters have been described as the hummingbirds of the fish world: colorful, small, and quick. Missouri has about 44 different types of darters. They are most diverse in the fast, clear, rocky streams of the Ozarks.