When to use it
- As a subsurface midge in cold or clear water.
- Alone or as a small dropper.
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Reviewed technical illustration← Fly Box
Nymph · guide 29
Mercury Midge
Pat Dorsey's glass-bead midge pattern with a slim thread body and fine wire rib.
- Common size
- #18–24
- Colors reviewed
- cream and copper, olive and copper, black and silver
- Imitates
- midge pupa, small subsurface midge
A translucent pearl glass bead, narrow thread abdomen, and fine wire rib are signature features. Body and rib colors vary, so every visible combination remains labeled.
Technical illustration
Identification views
Mercury Midge reviewed side profile
A schematic profile emphasizing translucent glass bead and slim thread body.
- View
- reviewed side profile
- Color shown
- cream body, copper rib, pearl glass bead
- Look for
- translucent glass bead; slim thread body; fine wire rib; optional compact thorax
On the water
Understand it. Then fish it.
The river, depth, insects, and fish behavior still decide the final presentation. These are reviewed starting points—not a claim about what is happening today.
How to fish it
- Dead-drift at the feeding depth.
- Keep the rig light enough for the lane.
Mistakes to avoid
- Confusing a metal-bead Zebra Midge with the glass-bead Mercury Midge.
- Hiding body color when labeling a variant.
Variant control
Small changes matter.
Three reviewed technical illustrations show the identifying profile, construction, and fishing orientation. They are schematic field-guide aids, not photographs.
Reviewed core form
A translucent pearl glass bead, narrow thread abdomen, and fine wire rib are signature features. Body and rib colors vary, so every visible combination remains labeled.- Colors shown
- cream and copper, olive and copper, black and silver
- Weighting
- Weighting is identified when it defines the reviewed form; other bead or weight choices remain labeled variants.
Review trail
Sources, rights, and limits.
Pattern facts were reviewed on 2026-07-12. Every image has its own rights record; photographed hand-tied flies may still vary slightly in proportion.