How to Identify Rosy Red Minnow

To identify Rosy Red Minnow (Pimephales promelas), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

The Rosy Red Minnow is characterized by a vibrant orange to reddish-pink body coloration, often with a lighter belly. The wild type (Fathead Minnow) is typically olive-brown to dark grey dorsally, fading to a silvery-white belly, with a dusky lateral stripe. Breeding males of the wild type develop dark heads and nuptial tubercles.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Small, upturned mouth, Incomplete or absent lateral line posteriorly, Dorsal fin origin slightly posterior to pelvic fin origin, Rosy Red variant: distinct orange to reddish-pink body color

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

Paired pectoral fins, typically with 13-17 rays.

Distinctive fins

Pelvic fins are abdominal, located well behind the pectoral fins.

Identification Tips

1. 1

   Coloration

   The most obvious distinguishing feature of the Rosy Red Minnow is its bright orange to reddish-pink body color, which sets it apart from the drabber wild-type Fathead Minnow and most other minnow species.

2. 2

   Mouth

   Observe the small, upturned mouth, characteristic of Pimephales species.

3. 3

   Lateral Line

   Note the lateral line, which is often incomplete or stops abruptly before reaching the caudal fin.

4. 4

   Body Shape

   The body is relatively stout and somewhat compressed laterally, especially compared to more slender minnow species.

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