Common Name

Scientific Name

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Photo by Unknown Photographer
Photo Courtesy of Utah Division of Wildlife Resources

The plains killifish, Fundulus zebrinus, is not native to Utah, but it has become established in several areas of the Colorado River drainage, in eastern Utah. The species also currently occurs in Juab and Millard Counties, in central and western Utah. The plains killifish naturally occurs east of the Rocky Mountains, from Montana to Texas.

The plains killifish is a small fish, with adults usually three inches in length or smaller. Most plains killifish individuals do not live longer than two years. The species feeds at the surface, eating primarily insects, insect larvae, and other aquatic invertebrates. Spawning occurs during the summer. The plains killifish may negatively impact native fish species, such as the least chub, so it should not be introduced to waters where sensitive native fish species occur.


  • Biotics Database. 2005. Utah Division of Wildlife Resources, NatureServe, and the network of Natural Heritage Programs and Conservation Data Centers.

  • Sigler, W. F. and J. W. Sigler. 1996. Fishes of Utah[:] a natural history. University of Utah Press. Salt Lake City. 375 pp.