While crossbreeding with other fish remains the biggest risk to Montana’s westslope cutthroat trout, new DNA testing shows the populations may be tougher than expected.
http://missoulian.com/news/state-and-regional/study-finds-montana-cutthroat-trout-holding-own-against-rainbows/article_280fb1fe-5e29-5e85-a249-5710e44d7cb4.html