Fundulus zebrinus is a species of fish in the Fundulidae known by the common name plains killifish. It is native to North America, where it is distributed throughout the Mississippi River, Colorado River, and Rio Grande drainages, and other river systems; many of its occurrences represent introduced populations.This fish grows up to about 6.9 centimeters long, with a maximum length of 8 to 10 centimeters. Its lifespan is up to 3 years, but most fish do not exceed two.