How to Identify Umatilla Dace

To identify Umatilla Dace (Rhinichthys umatilla), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface is typically dark olive to brown, fading to silvery-white on the ventral side. A prominent dark lateral stripe often extends from the snout to the caudal fin base. Fins are generally clear to slightly dusky. Breeding males may exhibit reddish or orange coloration on the fins and lower body.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Elongated, slender body, Subterminal mouth with small barbels at the corners, Small, embedded scales, Dark lateral stripe

Dorsal fin

Single dorsal fin, typically with 8 rays, located slightly posterior to the pelvic fins.

Tail fin

Moderately forked caudal fin.

Pectoral fin

Pectoral fins are relatively large and rounded.

Distinctive fins

Pelvic fins are abdominal.

Identification Tips

1. 1

   Body Shape and Size

   Look for a small, slender fish, typically reaching 7-10 cm (3-4 inches) in length, though some individuals can reach up to 12 cm (5 inches).

2. 2

   Mouth Position

   Observe the mouth, which is subterminal (located on the underside of the head, slightly behind the tip of the snout), and often has small, inconspicuous barbels at the corners.

3. 3

   Coloration and Lateral Stripe

   Note the dark olive to brown dorsal coloration, silvery-white belly, and the distinct dark lateral stripe running along the side of the body. This stripe can be more pronounced in some individuals.

4. 4

   Habitat

   If observed in its natural environment, its presence in cool, clear, fast-flowing gravel-bottomed streams and rivers is a strong indicator.

Explore Umatilla Dace