Also known as
Salmon Knot
What is the Improved Clinch Knot?
The Improved Clinch Knot is a Clinch Knot with an extra half hitch, to prevent it from becoming undone when there's a lot of load on the line.
The Improved Clinch Knot, what is it used for?
In fly fishing, the Improved Clinch Knot is an ideal knot for tying flies to the leader or tippet. Even with wet and cold fingers, the Improved Clinch Knot is relatively easy to tie.
Remarks
The Improved Clinch Knot works best on a thin flexible line.