The Rio Grande river in Colorado is known for its abundant populations of rainbow and brown trout. These species are popular among anglers and are highly sought after for their fighting spirit and excellent flavor. The river also supports a variety of other fish species, including brook trout, cutthroat trout, and kokanee salmon. In addition to these game fish, the Rio Grande is also home to a number of non-game fish species, such as sculpin and chub. Overall, the Rio Grande in Colorado offers a diverse and rich fishing environment for anglers of all skill levels.