Bull trout evolved with fire -- not logging and roads. Fires have a "pulse" effect on watersheds, or in other words there may be some short-term watershed effects. Roads are a "press" effect because they continually impact watersheds. This is why it is so important to maintain the migratory form of bull trout so if a fire or other natural event affects a stream it won't extirpate the population because there are other fish in the river or lake to re-populate it.
Exactly right George. Bull trout's need for the cold, clean water with little fine sediment make them an excellent indicator of how clean our water is. This is good for other aquatic life as well as people.
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