Osmore Pond

Brook Trout

The brook trout is widely considered the most beautiful freshwater fish in North America, and catching one in a pristine Montana mountain stream is an experience that captures the essence of backcountry fly fishing. Despite their common name, brook trout are not true trout at all; they are a species of char (genus Salvelinus), more closely related to lake trout and Arctic char than to rainbows or browns. Native to eastern North America from Georgia to Hudson Bay, brook trout were among the first salmonids introduced to Montana's waters in the late 1800s and have since established self-sustaining populations in cold, high-elevation streams and lakes throughout the state. In Montana, brook trout thrive best in small, cold headwater streams and high mountain lakes where competition from larger trout species is minimal. In these environments, they are often the dominant, or only, salmonid present. The trade-off is size: Montana stream-dwelling brook trout typically range from 6 to 10 inches, with fish over 12 inches considered noteworthy in most waters. What they lack in size, however, they more than make up for in beauty and willingness to eat a fly. Brookies are aggressive feeders that will strike attractor dry flies, nymphs, and small streamers with enthusiasm, making them an ideal species for beginning fly anglers and a delightful quarry for anyone who appreciates small-stream fishing. Brook trout do present a conservation paradox in Montana. While they are a beloved and beautiful gamefish, they are non-native and can negatively impact native species, particularly Yellowstone and westslope cutthroat trout. In headwater streams, brook trout often outcompete cutthroats for food and spawning habitat due to their higher reproductive rate and earlier maturation. As a result, Montana FWP has implemented brook trout removal projects on some streams to restore native cutthroat populations. In many waters, liberal harvest limits for brook trout are encouraged to reduce their numbers and benefit native fish. Anglers can enjoy excellent brook trout fishing while actively helping conservation by keeping a few for the pan.