Named for the red markings just under their lower jaw near the gill slits, cutthroat trout are a popular fishing species. Like many other trout, there are freshwater residents as well as a sea-run subspecies. Those who stay in freshwater tend to grow larger, up to 8 lbs (4 kg). Cutthroat trout will eat salmon eggs if they can find them; loose or damaged eggs are most readily found and eaten by cutthroat trout.
Like the rainbow trout, the cutthroat trout has been introduced to many bodies of freshwater.