How to Identify Bluntnose Minnow

To identify Bluntnose Minnow (Pimephales notatus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Generally olive-green to brownish on the dorsal side, fading to silvery-white on the belly. A distinct dark lateral stripe extends from the snout to the caudal fin base, often ending in a small caudal spot. Breeding males develop a darker body, tubercles on the snout, and two to three dark vertical bars on the sides.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Blunt, rounded snout that overhangs the mouth, Subterminal mouth, Incomplete lateral line (typically 39-45 scales in lateral series, with 10-25 pored scales), Small, dark caudal spot at the base of the tail fin, Dorsal fin origin slightly posterior to the pelvic fin origin, Males develop nuptial tubercles on the snout and head during breeding season

Dorsal fin

Single dorsal fin, typically with 8 rays. The first ray is often unbranched and thickened in breeding males.

Tail fin

Forked caudal fin.

Pectoral fin

Pectoral fins are relatively short.

Distinctive fins

No adipose fin. Pelvic fins are abdominal.

Identification Tips

1. 1

   Snout Shape

   The most distinguishing feature is the blunt, rounded snout that slightly overhangs the mouth. This gives it a 'blunt-nosed' appearance.

2. 2

   Mouth Position

   The mouth is subterminal, meaning it is located on the underside of the head, behind the tip of the snout.

3. 3

   Lateral Stripe and Caudal Spot

   A prominent dark lateral stripe runs from the snout to the caudal fin base, usually ending in a distinct, small dark spot on the caudal peduncle.

4. 4

   Lateral Line

   The lateral line is incomplete, with only the anterior scales being pored. This is a key differentiator from some similar minnow species.

5. 5

   Dorsal Fin

   The first ray of the dorsal fin is often thickened and separated from the rest of the fin, especially in breeding males.

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