Fish in Montana. Why not? Here is a guide from the Montana’s Official State Website. This Montana Field Guide is intended to assist in identification and field work. The guide provides number of observations and a general description. Habitat information is also provided.
Here is the general description of the Brown Trout – Salmo trutta
“The brown trout belongs to a different genus than our native trout species. They evolved in Europe and western Asia and were introduced to North America in 1883 and to Montana in 1889 in the Madison River. Today brown trout are found throughout most of Montana except the northwest and parts of the east. Generally, they prefer lower gradient, larger streams than cutthroat and rainbow, and they also do well in many reservoirs. Brown trout were widely stocked in the first half of this century, but today most come from natural reproduction. Brown trout are great competitors and generally are more tolerant of dewatering and other environmental disturbances than our other trout species. The state record is 29 pounds, and large fish are not at all uncommon, although 12-20 inches is the usual size range of adults. Brown trout spawn in gravel redds like our native trout but their spawning season is in the fall. This gives them a distinct advantage in some habitats since their spawning and incubation period lies outside the irrigation season. Brown trout are more predaceous than rainbow or cutthroat. Large fish often feed at night on other fish as well as crayfish and other invertebrates.”
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