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Sculpin (Cottus spp.)
Baitfish, in the drift all year, active in water between 33 and 72°F, and imitated at #2–8. Recorded from 7 of the 8 regions this map covers, across Michigan, Wisconsin, Virginia and North Carolina.
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A bottom-dwelling baitfish with an oversized flat head, fanned pectoral fins and no swim bladder, mottled olive-brown to match the gravel it lives on. It is the staple large prey item in most trout rivers and is present in every month of the year. Having no swim bladder, it cannot hover: it darts along the bottom and falls back, and it cannot outswim a big trout. That governs how it is imitated. The fly has to sink and be fished with the current, not swum steadily across it. The active band runs 33 to 72 degrees, covering cold, cold-transitional, cool and warm water, and hooks run large, size 2 to 8. It is the reason a dark streamer works in any month, in any water. Sculpin Streamer and Sculpzilla 2 to 8, Zonker 2 to 8, Muddler Minnow 4 to 10, Circus Peanut, Game Changer and Peanut Envy 2 to 6, and Woolly Buggers in black, brown or olive, 2 to 12.
- #2–8Hook size
- 33–72°FWater, active
- all yearAvailable
- 1Life stage fished
What it is
Baitfish · Cottus spp. · adult
A bottom-dwelling baitfish with an oversized flat head, fanned pectoral fins and no swim bladder, mottled olive-brown to match the gravel it lives on. The staple large prey item in most trout rivers.
A bottom fish that cannot outswim a big trout. The reason a dark streamer works in any month, in any water.
When it hatches
In the water twelve months a year, which is why the panel in the app ranks it below anything with a season.
peak shoulder not recommended
Water conditions
The band is a water temperature, not an air temperature, and it is the range in which this insect is worth fishing — for a mayfly that is the emergence window; for a scud or a midge it is simply the range trout will still eat one in.
Active from 33°F to 72°F. On this map that is cold, cold-transitional, cool, warm water — the band crosses 3 of the three breaks the river colours use. Breaks at 58, 64 and 70°F.
Stages
What the insect is doing, and what that means for what you tie on.
| Stage | What it is |
|---|---|
| adult | Cannot hover — it darts along the bottom and falls back. The imitation has to sink and be fished with the current, not swum steadily across it. |
Matching flies
10 patterns in this book imitate the Sculpin, across its stages. Which one to tie on follows the stage the water temperature says it is in — the app makes that call on a live reading; this page lists the whole set.
- Circus Peanut streamer · #2–6 — Articulated, rubber-legged, unapologetic. A Michigan big-brown fly.
- Game Changer streamer · #2–6 — Segmented and it swims on its own. Slow water, big fish, a lot of patience.
- Muddler Minnow streamer · #4–10 — Sculpin sunk, hopper skated. Older than the sport's opinions about it.
- Peanut Envy streamer · #2–6 — Big articulated meat for the hour either side of dark.
- Sculpin Streamer streamer · #2–8 — Any olive-and-tan wide-headed pattern. Dead-drifted or swung in low light.
- Sculpzilla streamer · #2–8 — Rides hook-up on a heavy head. Fished on the bottom where sculpins actually live.
- Woolly Bugger (Black) streamer · #2–12 — If you could only own one fly. Leech, sculpin, big nymph, all of it.
- Woolly Bugger (Brown) streamer · #2–12 — Brown with a bit of copper reads as a crayfish. Hop it along the bottom.
- Woolly Bugger (Olive) streamer · #2–12 — The clear-water version. Smaller and lighter than you think you need.
- Zonker streamer · #2–8 — Rabbit strip that breathes at rest. Deadly on the pause, not on the strip.
Where to find it right now
The rivers with a page here that sit in this insect's regions, with a USGS gauge reporting water temperature. This list is re-ranked against the reading each gauge is sending now and today's date, so it is live — the fallback below it, if the readings do not arrive, is each river's measured July mean.
- Smith River the Virginia mountains · July mean 51.9°F
- Ararat River the North Carolina mountains · July mean 49.9°F
- Back Creek the Virginia mountains · July mean 49.9°F
- Big Cherry Creek the Virginia mountains · July mean 49.9°F
- Big Ivy Creek the Virginia mountains · July mean 49.9°F
- Boothe Creek the Virginia mountains · July mean 49.9°F
- Brogan Branch the Virginia mountains · July mean 49.9°F
- Browns Dan River the Virginia mountains · July mean 49.9°F
- Brushy Fork the Virginia mountains · July mean 49.9°F
- Camp Creek the Virginia mountains · July mean 49.9°F
Regional presence
Regions, not collection records. This insect is recorded from the coarse regions below; nobody has surveyed which named river it has been caught on, and this page will not pretend otherwise.
- northern lower Michigan MI
- southern lower Michigan MI
- the Upper Peninsula MI
- the Wisconsin driftless WI
- northern Wisconsin WI
- the Virginia mountains VA
- the North Carolina mountains NC
Rivers in these regions with a page here
- Au Sable River
- Catawba River
- Jackson River
- Muskegon River
- Escanaba River
- Saint Croix River
- Smith River
- Tygart Valley River
- Kalamazoo River
- Aaron Creek
- Aaron Run
- Aarons Run
- Abb Run
- Abes Run
- Abitosse Creek
- Abram Creek
- Acme Creek
- Acorn Branch
- Adamcamp Branch
- Adams Creek
- Adams Creek
- Adamson Run
- Addis Creek
- Adkins Rockhouse Branch
- and 6371 more
Related hatches
Same family, or overlapping this one's calendar on the same water.
- Minnows + Dace Notropis / Rhinichthys spp. · Baitfish · all year
- Black Ant Formicidae · Terrestrial · June–September
- Blackfly Simulium spp. · Midge · April–June
- Blue-Winged Olive Baetis spp. · Mayfly · March–May and September–November
- Caterpillar Lepidoptera larvae · Terrestrial · May–September