One of the most popular and reliable knots for fly fishing is the Improved Clinch Knot. To tie this knot, pass the line through the eye of the hook and double back parallel to the standing line to form a loop. Then, make 5-7 wraps around the line and pass the tag end through the loop near the eye of the hook. Moisten the knot and pull the tag end to tighten it. Trim any excess. This knot is strong and secure, perfect for fly fishing.

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Fly Fishing Knot Tying Improved Clinch Knot