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Many of the best "fishing holes" for wild brook trout are formed when a tree falls into a stream. Fallen trees often cause the current to carve out deep pools, which are ideal habitat for adult brook trout and critical to their survival during the winter.
Fallen trees also break up the current, creating pockets of deep, slow water with nearby faster current. Brook trout often feed by holding in areas of slow current that are near areas of faster current, where they watch for insects to drift by and then dart out and grab them.
Fallen trees also help the stream to retain gravel, which is used by brook trout for spawning.
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