The leech is an important part of a fishes diet in both lakes and rivers. They’re a very popular food source for trout, especially in the early morning and late in the evening.
My fly box is loaded with a variety of leech patterns like:
Fish will often smack a leech in an attempt to get it to roll up into a ball for easier consumption, which is why you may experience many short strikes when fishing a leech pattern.
The majority of leech patterns are simple and quick to tie, making them one of the more popular patterns for both beginner and expert fly tyers. Leeches can grow to be quite large and are typically tied in the size 8 to 12 range.
One of the most important steps in tying a leech is determining the weight placement. I always weight my hooks with a few wraps of non-lead wire. Beadhead or conehead leeches are effective ways to simulate the swimming, undulating motion of a natural leech.