 The introduction of non-native species such as brook trout ("Salvelinus fontinalis"), brown trout ("Salmo trutta"), and rainbow trout ("O. mykiss") was also detrimental to the greenback cutthroat.The former two species competed with greenback cutthroats while the latter hybridized with it, creating cutbows.Other subspecies of cutthroat were introduced to greenback habitat, further damaging populations due to hybridization.