 Cutthroats usually display distinctive red, pink, or orange linear marks along the undersides of their mandibles in the lower folds of the gill plates.These markings are responsible for the common name "cutthroat" given to the trout by outdoor writer Charles Hallock in an 1884 article in "The American Angler"., although the red slashes are not unique to the cutthroat trout and some coastal rainbow trout and redband trout also display throat slashes.The sea-run forms of coastal cutthroat average , while stream-resident forms attain much smaller sizes .