How to Identify Redhorse Fish

To identify Redhorse Fish (Moxostoma), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Variable by species, but generally silvery to brassy on the sides, darker dorsally (olive to brownish), and whitish ventrally. Fins, especially the caudal fin, are often reddish or orange, giving them their common name. Some species may have dark spots or stripes.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Subterminal, papillose mouth adapted for bottom feeding, Thick, fleshy lips with numerous papillae, Typically reddish or orange caudal fin, Large, cycloid scales, No barbels

Dorsal fin

Single dorsal fin, typically with 12-15 rays, located mid-body.

Tail fin

Deeply forked caudal fin, often reddish or orange.

Pectoral fin

Moderately sized, located low on the body.

Distinctive fins

Pelvic fins are abdominal, located well behind the pectoral fins. All fins lack spines.

Identification Tips

1. 1

   Mouth

   Observe the subterminal, sucker-like mouth with thick, fleshy, papillose lips. This is a key characteristic of all suckers, including Redhorse.

2. 2

   Caudal Fin Color

   Many Redhorse species exhibit a distinct reddish or orange caudal (tail) fin, which is a primary indicator for the genus.

3. 3

   Scale Size

   Redhorse typically have large, cycloid scales. The number of scales in the lateral line can be a distinguishing feature between species.

4. 4

   Body Shape

   Generally torpedo-shaped or slightly compressed, not as deep-bodied as some other suckers.

5. 5

   Dorsal Fin Rays

   Count the number of dorsal fin rays (typically 12-15) as this can help differentiate from other sucker genera or even between Moxostoma species.

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