The U.S. State of Colorado is home to 101 fishes, 55 of which are native. Twenty-three native species are threatened or endangered at either the federal or state level. The federally endangered species are the Humpback Chub (Gila cypha), Bonytail (Gila elegans), Colorado Pikeminnow (Ptychocheilus lucius), and Razorback Sucker (Xyrauchen texanus).
Retrieved from
https://taurus.cnr.colostate.edu/projects/cofishguide/index.cfm
Fuller, P. (2017). NAS-Nonindigenous Aquatic Species. USGS.
Retrieved from
https://nas.er.usgs.gov/about/default.aspx
"The IUCN Red List of Threatened Species." IUCN Red List of Threatened Species,
Retrieved from
https://www.iucnredlist.org/
Page, Lawrence M., and Brooks M. Burr. A Field Guide to Freshwater Fishes: North America, North of Mexico. Houghton Mifflin Company, 2010.