Tying a leader to the main line is crucial in sport fishing to ensure a smooth and strong connection between the two lines. One of the most popular knots for this purpose is the Double Uni Knot. Here's how you can tie a leader to the main line using the Double Uni Knot:

1. Overlap the end of the leader and the main line by about 6 inches.
2. Form a loop with the leader line and pass the tag end of the leader through the loop three times.
3. Moisten the knot and pull the tag end to snug up the wraps.
4. Repeat the same process with the main line.
5. Pull both lines to tighten the knot together.

This knot is strong, reliable, and easy to tie even in low light conditions. Remember to trim the tag ends closely for a neat finish. Practice tying this knot before your fishing trip to ensure you can do it quickly and efficiently when on the water.

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Topics covered in this question:

Fishing Tips Knots Leader Main Line