How to Identify Redside Dace

To identify Redside Dace (Clinostomus elongatus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface olive-green to brownish, fading to silvery-white on the belly. A prominent, iridescent red stripe extends from behind the operculum to the caudal peduncle, most vibrant in breeding males. Above this red stripe, a narrow golden or yellowish stripe is often present. Fins are typically clear to slightly yellowish.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Elongated, slender body, Large, forward-facing eyes, Small, subterminal mouth, Bright red lateral stripe (especially in breeding individuals), Absence of barbels

Dorsal fin

Single, short-based dorsal fin located posterior to the pelvic fins, typically with 8 rays.

Tail fin

Moderately forked caudal fin.

Pectoral fin

Pectoral fins are relatively small and rounded.

Distinctive fins

Pelvic fins are abdominal, located beneath or slightly anterior to the dorsal fin origin.

Identification Tips

1. 1

   Body Shape and Size

   Slender, elongated body, typically reaching 7-12 cm (3-5 inches) in length, with a maximum recorded length of about 14 cm (5.5 inches).

2. 2

   Coloration

   Look for the distinctive bright red lateral stripe, particularly vibrant during the spring breeding season. This stripe is often bordered dorsally by a golden or yellowish stripe.

3. 3

   Mouth and Eyes

   Possesses a small, subterminal mouth and relatively large eyes, adapted for surface feeding and detecting aerial prey.

4. 4

   Fin Position

   The dorsal fin originates behind the pelvic fins, a characteristic feature among some dace species.

5. 5

   Scales

   Scales are relatively small and cycloid, giving the fish a smooth appearance. The lateral line is complete and slightly decurved.

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