How to Identify Western Blacknose Dace

To identify Western Blacknose Dace (Rhinichthys obtusus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface is typically olive-brown to dark brown, fading to a lighter, silvery-white ventral surface. A prominent, dark lateral stripe runs from the snout through the eye to the caudal fin base. Breeding males may develop reddish-orange coloration on the lower fins and snout.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Prominent dark lateral stripe, Subterminal mouth with a small barbel at each corner, Snout projects slightly beyond the mouth, Small, embedded scales

Dorsal fin

Single dorsal fin, typically with 8 rays, originating slightly behind the pelvic fin origin.

Tail fin

Forked caudal fin.

Pectoral fin

Pectoral fins are relatively small.

Distinctive fins

Pelvic fins are abdominal.

Identification Tips

1. 1

   Lateral Stripe

   Look for the distinct, dark lateral stripe extending from the snout to the tail. This stripe is usually continuous and well-defined.

2. 2

   Mouth Position

   Observe the subterminal mouth, where the snout slightly overhangs the mouth. This is a key feature distinguishing it from some other dace species.

3. 3

   Barbel

   Check for a small, inconspicuous barbel at each corner of the mouth. This can be difficult to see without close inspection.

4. 4

   Snout Shape

   The snout is somewhat blunt and rounded, projecting slightly beyond the mouth.

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