Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Central mudminnow - Umbra limi

Non-native Species

Global Rank: G5
State Rank: SNA

Agency Status

External Links

General Description
Mudminnows are small, robust fishes with soft-rayed fins. The dorsal fin is set well back toward the tail, and the tail fin is rounded. The Central Mudminnow is the only Montana species and has a black bar at the base of the tail fin. Unauthorized introductions into Montana.

Diagnostic Characteristics
Overall dark colored; olive brown to brown-black above, sides mottled with dark brown or may have as many as 14 irregular dark vertical bars. Underside white to yellowish. Head broad, lateral line absent. Male's anal fin long, almost reaches base of tail fin; female's anal fin does not reach base of tail fin.

Species Range
Montana Range Range Descriptions


Observations in Montana Natural Heritage Program Database
Number of Observations: 30

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Small ponds, slow moving streams and marshes. Usually associated with vegetation, organic debris and mud.

Very hardy. Can withstand water temperature extremes and comparatively high acidity. When oxygen in water insufficient, can gulp air at surface and use atmospheric oxygen. Therefore, tolerates stagnant conditions.

Unauthorized introductions into Montana.

Login Logout
Citation for data on this website:
Central mudminnow — Umbra limi.  Montana Field Guide.  .  Retrieved on , from