Midge / EmergersThread Midge
The Thread Midge, also known as the Yong Special, is a deceptively simple pattern that has proven devastatingly effective on selective trout. Popularized by Andy Kim over 20 years ago, this minimalist design uses only silk thread wrapped over a glass bead to create a translucent, segmented body that perfectly imitates midge pupae. The glass bead adds subtle color and weight while maintaining a natural appearance.
Year Round
Beginner
Trout
Overview
The Thread Midge gained notoriety in fly fishing circles, with Cheech at Fly Fish Food joking it was "almost banned" due to its effectiveness. The pattern's simplicity is its strength - the pure silk body creates natural segmentation and a subtle sheen that closely mimics the translucent appearance of midge pupae. The glass bead provides a slower sink rate than tungsten versions, making it ideal for fishing in the film or shallow water. Experiment with different silk and bead color combinations to match local midge populations.
Pattern Characteristics
Materials
Hook: Fulling Mill 5027 Grab Gape Heavy Barbless, size #20 (or TMC 2488)
Thread: Semperfli Classic Waxed Spyder Thread 18/0, dark mocha brown
Bead: Killer Caddis Glass Bead, midge size, CC-Copper
Body: Semperfli Pure Silk, Straw #2
Fishing Tips
Season
Effective year-round wherever midges are present. Particularly productive during winter months when midges are often the primary food source, and during spring and fall midge emergences when fish key in on pupae.
Presentation
Dead drift through feeding lanes, focusing on slower water where midge pupae naturally congregate. The glass bead creates a slower descent than tungsten, making this pattern excellent for fishing higher in the water column or in the surface film.
When to Use
Deploy when trout are visibly rising to midges or making subtle head-and-tail rises. Excellent during midge emergences and as a confidence pattern on tailwaters. Works well when fish are being selective and refusing larger or flashier offerings.
Water Type
Excels in tailwaters and spring creeks where midge populations are abundant. Effective in slower pools, tailouts, and seams where pupae collect before emerging. The lighter weight makes it ideal for shallow flats and slower currents.
Rigging Suggestions
Fish on 6X-7X fluorocarbon tippet, 18-24 inches below a dry fly or small indicator. Works well as a dropper in a multi-fly euro rig. Keep multiple color variations ready to match changing conditions.
Visibility & Floatation
The glass bead provides gentle weight for a slow, natural descent. The silk body creates a subtle glow that attracts attention without appearing unnatural. Sinks slower than tungsten beadhead versions, ideal for suspending in the film.
