GreenBack Cutthroat Trout was officially named the state fish of Colorado in 1994. They are rare and found in small mountain streams and lakes along Colorado's Front Range.

The Cutthroat (Oncorhynchus clarki) deserves to be state fish, as it is the only trout that is native (indigenous) to Colorado. It has a crimson slash on either side of the throat, below the lower jaw. The Greenback is a threatened species on both a state and federal level.

Where to find them: Turquoise and Twin Lakes, Clear Creek, Spinney Mtn, Taylor, Elevenmile Reservoirs, Lake John, Delaney Buttes lakes, Trappers Lake (the largest population of native Colorado River cutthroat trout in the world), South Platte River. Snake River Cutts have been introduced into a host of mountain streams and lakes.

The main fish stocked in Colorado, Courtesy Colorado Division of Wildlife.

The Rainbow (Oncorhynchus mykiss) was introduced to Colorado in the 1880's. It is identified by a reddish stripe running down the side of the fish, and by black spots. It was introduced in 1888 into the Gunnison River. They are native to the U.S., but not to Colorado. They spawn in the Spring.

Record: The Colorado record for catching a Rainbow was in 2003 in Morrow Point Reservoir. The fish weighed 19 lbs, 10 oz.

Some fishing spots for Rainbow: almost anywhere -Arkansas, Conejos, Blue, Fryingpan, Gunnison, Taylor, Dolores, Big Thompson, South Platte, Rio Grande Rivers. Steamboat Lake, South Delaney Butte Lake, Turquoise and Twin Lakes. Taylor, Spinney Mtn, Elevenmile, Clear Creek, Road Canyon, Rifle Gap, and Stagecoach Reservoirs.

Abundant throughout Colorado
The Brown (Salmo trutta) was introduced to Colorado in 1890, and is native to Europe and Western Asia. It's identifying marks are black spots, and reddish orange spots inside of light blue circles. They spawn in the fall.

Record: The record Brown caught in Colorado was in 1988, 30 lbs, 8 oz., caught at Roaring Judy Ponds.

Where to go: Elevenmile, Taylor, Spinney Mtn, Beaver Creek, and Clear Creek Reservoirs; Turquoise Lake, Twin Lake, N. Delaney Buttes lakes; Arkansas, Conejos, Rio Grande, Blue, Gunnison, Taylor, Cache la Poudre, South Platte, Dolores, Big Thompson and numerous other rivers.

A very prolific fish
The "brookie" (Salvelinus fontinalis) can basically outbreed the other species of fish, helped by its fall spawning. They were introduced to Colorado in 1872, and are native to Canada and the Eastern U.S. Their body is dark, with red and white spots within bluish circles. The pectoral, pelvic and anal fins can be orange, with black and white edges.

Record: The record Brook caught in Colorado was in 1947, weighing 7 lbs, 10 oz. at Upper Cataract Lake.

Where to find them: North Platte River, Road Canyon Reservoir, East Delaney Butte Lake, S. Boulder Creek; almost all high-mountain lakes, streams, and beaver ponds

The largest trout
Courtesy Colorado Division of Wildlife
The Lake trout, or Mackinaw, (Salvelinus namaycush) were introduced in 1890. They can live up to 20 years. They are native to Canada, Alaska and the Great Lakes . They spawn in the fall. They have irregular white spots on their dark bodies. They prefer deeper water, but will feed in shallower waters during spring and fall. Their tail fin is deeply indented.

Record: The Colorado record is 44 lbs, 5 oz caught in 2003 at Blue Mesa Reservoir.

Where to find them: Turquoise Lake, Blue Mesa Reservoir, Taylor Reservoir, North Catamount Reservoir.

Another native
The Mountain Whitefish (Prosopium williamsoni) is indigenous to the White and Yampa Rivers. It was introduced into the Cache la Poudre and Roaring Fork Rivers. It spawns in the fall. It's mouth is smaller than a trout's, making angling more difficult.

Record: The Colorado record for a whitefish was in 1982, weighing 5 lbs, 2oz. and caught on the Roaring Fork River.

Where to find them: Cache la Poudre, White, Yampa, and Roaring Fork rivers, plus numerous lakes.