How to Identify Eastern Mudminnow

To identify Eastern Mudminnow (Umbra pygmaea), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dull olive-brown to dark brown on the dorsal side, fading to a lighter brown or yellowish-white on the ventral side. Sides often have 10-14 faint, narrow, dark vertical bars. A prominent dark bar or spot is present at the base of the caudal fin. Fins are typically dusky.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Dark vertical bar at the base of the caudal fin, Rounded caudal fin, Ability to gulp air, Small, cycloid scales

Dorsal fin

Single, short, and rounded, located posteriorly on the body, typically with 13-16 soft rays.

Tail fin

Rounded, with a distinct dark bar at its base.

Pectoral fin

Small and rounded, located low on the body.

Distinctive fins

Pelvic fins are small and located abdominally. All fins lack spines.

Identification Tips

1. 1

   Caudal Fin Bar

   Look for the prominent dark vertical bar at the base of the caudal fin, which is a key distinguishing feature.

2. 2

   Body Shape and Coloration

   Observe the cylindrical, somewhat stout body and the olive-brown to dark brown coloration with faint vertical bars on the sides.

3. 3

   Fin Shape

   Note the rounded dorsal, caudal, and pectoral fins, and the absence of spines in all fins.

4. 4

   Habitat

   If found in heavily vegetated, slow-moving, or stagnant waters, it is likely an Eastern Mudminnow.

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