{
  "url": "https://theflybench.com/patterns/cdc-transitional-midge",
  "id": "cm8v25j0j008kusxb4fnm1xwr",
  "title": "CDC Transitional Midge",
  "slug": "cdc-transitional-midge",
  "description": "The CDC Transitional Midge is a highly effective surface pattern that mimics an emerging midge pupa. The CDC provides excellent floatation and the slim body gives it a realistic silhouette.",
  "imitates": "Emerging Midges",
  "patternCategory": "midge-emerger",
  "difficulty": "Advanced",
  "targetSpecies": "Trout",
  "waterTypes": [
    "Stillwater",
    "Moving Water"
  ],
  "seasons": [
    "Spring",
    "Fall"
  ],
  "materials": "**Hook**: Standard dry-fly hook (here a TMC 100), size 18-22.\n**Thread**: 6/0 or 140 Denier, olive.\n**Tail**: Grizzly neck feather.\n**Wingcase/Wings/Head**: CDC Puff, dark natural.\n**Body**: Australian possum dubbing, natural.",
  "images": [
    {
      "url": "/images/patterns/midge-emerger/cdc-transitional-midge.webp",
      "source": "The Fly Bench"
    }
  ],
  "videos": [
    {
      "url": "https://www.youtube.com/watch?v=hVQm9S7C58I",
      "label": "Tightline Productions"
    },
    {
      "url": "https://www.youtube.com/watch?v=gWdDye76NHU",
      "label": " JD's Wide World of Fly Fishing and Tying"
    }
  ],
  "createdAt": "2025-03-29T22:20:16.302Z",
  "updatedAt": "2025-04-05T23:15:39.267Z",
  "variantOf": "",
  "regions": [
    "Rocky Mountain"
  ],
  "waters": [
    "Henry's Fork",
    "Madison River",
    "Missouri River"
  ],
  "tags": [
    "dead-drift",
    "midge-hatch",
    "low-clear-water",
    "flats"
  ],
  "essential": false,
  "tier": "",
  "entomology": {
    "order": "Diptera",
    "family": "Chironomidae",
    "commonName": "Midge",
    "organismType": "insect",
    "lifeStage": "general",
    "behavior": "Transitional midges hang in the surface film with their pupal shuck half-shed, trapped in the meniscus as the adult insect struggles to free itself from the confining exoskeleton. This protracted emergence process leaves them completely helpless for extended periods, often minutes, creating a feeding opportunity where fish sip emergers methodically. The clustering of emergers during peak hatch periods triggers sustained surface feeding as trout move into position beneath seams and eddies."
  },
  "relatedPatterns": [
    {
      "slug": "tubing-midge",
      "type": "same-hatch"
    },
    {
      "slug": "chironocones",
      "type": "same-hatch"
    },
    {
      "slug": "biot-midge-pupa",
      "type": "same-hatch"
    },
    {
      "slug": "glo-brite-miracle-midge",
      "type": "same-hatch"
    },
    {
      "slug": "adams-fly",
      "type": "same-hatch"
    },
    {
      "slug": "griffith-s-gnat",
      "type": "same-hatch"
    },
    {
      "slug": "hatching-midge",
      "type": "same-hatch"
    },
    {
      "slug": "poly-wing-midge",
      "type": "same-hatch"
    }
  ],
  "behaviorPresentation": "**Natural Behavior**: The transitioning midge hangs vertically beneath the film, partially emerged with the adult trapped in the pupal shuck. Struggles to escape create subtle movement that cruising fish detect.\n**Where Trout Eat It**: Fish patrol just below the surface in current seams and slicks, targeting the film zone where midges cluster during emergence.\n**How to Fish It**: Suspend in the film with dead drifts, allowing the CDC to maintain the critical depth where fish are focused. Patience matches the natural's prolonged hang.\n**Best Water**: Work current seams where surface lanes concentrate emergers, slicks with visible risers, and tail-outs during midge activity.\n**Strike Type**: Barely visible sips or subtle dimples as fish gently inhale the suspended midge.",
  "fishingStrategy": "**Rigging Suggestions**: Fish on a 10-12 foot leader with 6X or 7X tippet for spooky fish. Can be fished solo or as dropper below a small dry fly like a Parachute Adams. **Seasonal Timing**: Prime during April-May and October-November midge hatches, though effective any time water temperatures are between 38-55°F. months can produce exceptional results on tailwaters. **Pro Tips**: Apply floatant only to the CDC wing, allowing the body to hang in the film. During spinner falls, this pattern doubles as an effective midge cluster imitation.",
  "overview": "This emerger-style midge pattern is tied to represent the moment a midge is emerging through the surface film. It features a sparse, tapered body (often thread or fine dubbing), a CDC puff for the wing to mimic the adult emerging, and may include a trailing shuck of Zelon. The CDC adds both buoyancy and a natural sheen, making it effective in flat water when fish are sipping emergers."
}