Historically, only 14 species of fish inhabited the upper Colorado River basin, but over 40 non-native species have been added since the late 1800s. The native fish species in Canyonlands are primarily chub, minnows and suckers, and many are not found anywhere else. These include the Colorado pikeminnow (formerly squawfish), razorback and flannelmouth sucker, as well as humpback and bonytail chub.