The eastern mudminnow (Umbra pygmaea) is a species of freshwater fish belonging to the family Umbridae.

[4] The eastern mudminnow has shown great adaptability to poor habitats with low pH, temperature, and presence of oxygen.

[6] The eastern mudminnow are bottom-feeders and feed on insect larvae, worms, molluscs, and crustaceans.

The spread of the fish to six European countries in the 20th century is mostly attribute to popularity in the aquaculture and aquarium trades.

[6] The spread of the eastern mudminnow in these parts of Europe seems to be slow and primarily human mediated (due to usage as live bait or for aquariums).