. >> mosel and his teamwork the glacier nationality park. >> this is climate poster child of north americas warming, we actually see fish moving up the mountain sides. >> that means the trowt trout me to cooler waters. >> this should be a good day. we go into small streams and we use a back tack electrofisher. there's one right there , cutthroat. chaka kahn we're on. >> what are we doing? >> fishing some native cutthroat trout. >> what's the problem here? >> warming temperatures are actually causing the fish to come off sooner. >> these fish like it cold. >> they like it cold. sooner or later, there's going to be nowhere else to go. yep, there's one, little cutthroat. >> how important is the fish in these streams to montana? >> these streams are actually the life blood to montana. they provide nursery areas for our native fish. >> after capturing numerous fish, the team sets up a triage on the side of the stream. >> we take critical measurements such as length and weight. its length is 92 millimeters. and its weight is just a mere tim five grams. >> how do you know it's a cutthroat trout?