Midges

Telling it apart

• Tiny: size 18–24, among the smallest insects in this whole chapter.
• A true-fly body plan: only two wings, no tails at all — unlike every other insect covered so far.
• The larva (often called a "bloodworm") lives in mud, sometimes tinted red by a hemoglobin that lets it survive in low-oxygen water.
• The pupa hangs vertically, just under the surface film, often for long minutes before the adult breaks free.
• Adults form dense mating swarms just above the water, especially on calm, mild days in the shoulder seasons.

The only insect that lasts all winter

The chironomid larva lives in the mud and silt of calm stretches, and in several species it produces a hemoglobin that lets it pull oxygen from water where almost nothing else can survive — that's what gives it its reddish "bloodworm" colour. That tolerance is the whole reason it stays active year-round, while most of the insects in this chapter vanish entirely for a good part of the year.

The two peak windows (mid-March to mid-May, then October to mid-November) are no accident: those are exactly the stretches when trout have nothing else to eat, and when a chironomid makes the entire difference between a fed fish and an unfed one.

The vertical hang

Here is the detail that governs all chironomid fishing. The pupa swims toward the surface, then hangs vertically, head just under the film, sometimes for long minutes before the adult breaks free. It doesn't drift, it doesn't swim actively — it just sits there, motionless, half in and half out.

That is exactly what makes it a low-risk, high-value meal for a trout: still, predictable, available for a long stretch. A fly fished static and vertical in the film imitates that behaviour far better than a mayfly-style drift — and that specific mismatch is often why an otherwise "perfect" pattern fails in front of active chironomids.

Tiny, so it's about precision

At size 18–24, presentation and exact silhouette matter enormously — the same principle as with the Trico, just stretched across twelve months instead of three. Fine tippet (6X, sometimes 7X) and a genuine pause in the presentation often matter more than the precise pattern chosen.

Since a chironomid hatch is happening somewhere on the water almost every day of the year, it's worth always carrying a few — not just for the lean months, but for any quiet day when nothing else seems to be happening.