The Double Surgeon's Knot is a popular knot used in fishing to join two lines together, particularly when connecting a leader to a mainline or when tying two pieces of line with different diameters. It is favored for its simplicity and strength.

To tie a Double Surgeon's Knot, follow these steps:
1. **Overlap the Lines**: Take the two lines you want to join and overlap them, leaving about 6 inches of the ends.
2. **Create a Loop**: Form a loop by bringing the end of the top line over the bottom line.
3. **Wrap and Pull**: Pass the end of the top line through the loop you just created. Do this twice to create a double knot.
4. **Wet the Knot**: Before pulling tight, wet the knot with saliva or water to reduce friction.
5. **Tighten**: Pull on both standing lines to tighten the knot. Trim any excess line if necessary.

This knot is particularly useful in situations where you need a strong connection that can withstand the pull of a fish. Remember to practice tying it to ensure you can do it quickly and efficiently when you're out on the water. Happy fishing!

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Topics covered in this question:

Fishing Techniques Sport Fishing Fishing Knots Knot Tying Double Surgeon Knot