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Tie a Blood Knot:

A blood knot (Barrel knot) is most usefully employed for joining sections of monofilament nylon line while maintaining a high portion of the line's inherent strength. Other knots used for this purpose can cause a substantial loss of strength. In fly fishing, this serves to build a leader of gradually decreasing diameter with the castable fly line attached at the large diameter end and the fly or hook at the small diameter end. The principal drawback to the blood knot is the dexterity required to tie it.


In tying the blood knot, the two lines to be joined are overlapped for 6-8 cm with the short ends of the two lines in opposite directions. The short end of one line is then wrapped 4-6 times around the second line and the remaining portion of the first short end brought back and passed between the lines at the beginning of the wraps. The short end of the second line is then wrapped 4-6 times around the first line and the end of this line brought back and passed through what is now an oval space between the first wrap of each set.

blood knot pic.

This image was created by Chris 73.