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Clouser Deep Minnow
Bucktail: Only a few patterns are as generally useful and widespread as the Clouser Deep Minnow. Only a few patterns have their own entry in Wikipedia, but the Clouser Deep Minnow is up there with the Woolly Bugger, the Muddler Minnow, Grey Ghost, Royal Coachman, Diawl Bach and a few others.
Read about this simple but ingenious flly
Read the whole article about perch fishing here