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Stonefly

Golden Stonefly

Calineuria californica · species

A big, meaty stonefly that can turn trout onto heavy nymphs and skittering adults.

Overview

About Golden Stonefly

Calineuria californica is a North American stonefly in the family Perlidae, often called the western stonefly. For anglers, it falls into the golden stone group: a large, high-value bug that matters most as a nymph and as an egg-laying or fluttering adult.

Also known as: Golden Stone

Life Cycle

Eggs

Female golden stoneflies deposit their egg pods into the river, where they settle on the bottom to develop.

nymph

Tiny grubs hatch from the eggs and begin feeding on decaying organic matter. These nymphs live among rocks underwater, growing through many molts over one to three years.

Mature Nymph

Once fully grown, the mature nymph prepares for emergence by migrating towards the shore, often crawling onto rocks or emergent vegetation.

Emerger

The nymph crawls out of the water, onto a suitable surface. Here, the adult stonefly begins to hatch from its nymphal skin.

Adult

Adult golden stoneflies emerge and typically live only a short time above the water. Their primary focus during this aerial phase is to find a mate.

Egg Laying Female

After mating, the female adult completes the cycle by returning to the water to deposit her egg pods, initiating the next generation.

Stages: Incomplete metamorphosis: aquatic nymph to winged adult. Anglers most often fish the nymph stage and the adult stage.
Emergence cues: Most important in the warmer part of the season as water warms; adults are often most visible along banks during emergence and egg-laying periods, especially in lower light or when they return to the water.
Behavior: Nymphs live on the bottom in current and can drift when dislodged. Adults emerge out of the water, rest on streamside structure, then return to lay eggs, sometimes fluttering, skating, or falling onto the surface.

How to Tie Golden Stonefly Patterns

Eggs

How to Tie by Yours Truly: Egg Cluster Fly

Yours Truly Fly Co.

Materials

Nova Tackle Co. salmon and steelhead hookSize 1You can use whatever hook you prefer
waxed red thread6/0You can use whatever thread you prefer, white
stretch bead cord.7mmMono also works well
glass seed beads6/0White and tan
UV resin

nymph

Mini Stone Fly Nymph | Easy Dropper Pattern!

Mainely Flies

Materials

Hook
Bead
Thread
Lead-free wire
Ribbing Wire
Tail/wing material
Dubbing
UV resinRecomended

Mature Nymph

The ONLY Stone Fly YOU Need!

Mainely Flies

Materials

Thread 20/6
Legs and tail
Vinyl
Lead-free wire
Back
Dubbing
Bead
Hook
Uv resin
Uv light

Emerger

Fly Tying for Beginners - an AP Stonefly Nymph

Savage Flies

Materials

Hook#8-14 long shank
ThreadBlack, brown or to match the body
TailGrizzly hackle fibers
BodyYarn, any natural color
ThoraxGrizzly hackle, palmered

Adult

Friday Night Ties: How to tie the "Foam Is Home Stonefly 2.0" with Tim Sickles

Backcountry Hunters & Anglers

Materials

Hook#4TMC 200R
ThreadDanville 70 - Rusty Brown
Rubber LegsMedium round rubber legs for tail - Black
Foam2mm and 1mmCross Link Foam - Cinnamon
EP FibersUnderwing - Triggerpoint - PMD and BWO
Foam2mmThorax/Head - Cinnamon
Rubber LegsSmall, round for antennae - Black
Rubber LegsMedium Round for legs - Black

Egg Laying Female

Egg Laying Stonefly

Oholi's flies

Materials

Hook8Says it is an “Erics”/likely Ahrex caddis-style hook, used here for a stonefly dry
ThreadUsed to start fly, secure materials, and make dubbing loop
Black hot spot / egg sac materialImitates black stonefly egg sac; material not clearly named
Body dubbingSame dubbing he says he uses for nymphs; loose noodle for buggy fibers
CDC feathers OneUsed for rear/back pair of wings
CDC feathers TwoUsed for middle wing section
CDC feather ThreeFibers clipped and spun in dubbing loop for front/body hackle effect

Fly Patterns

Chubby Chernobyl#6-12
Orange Stimulator#8-14
Pat's Rubber Legs#4-10
Rogue Foam Stone#4-10
Stimulator#6-14

Angler Notes

Why it matters: Golden stones are a classic match-the-hatch food source because they are large, calorie-rich, and vulnerable in two fishable forms: bottom-dwelling nymphs and bank-oriented adults. Even when no hatch is obvious, trout often recognize big stonefly nymphs as worth eating.
Imitation tips: Fish heavy stonefly nymph patterns in golden, tan, amber, or brown tones near the bottom. For adults, use buoyant high-floating patterns with a golden-brown profile; a little movement can help when fishing egg-layers tight to banks, ledges, and overhanging vegetation.
Key life stages: nymphadult
Presentation: Nymphs: dead-drift deep through riffles, runs, pocket water, and along seams near structure. Adults: cast tight to banks and likely drop zones, then let the fly drift naturally or add short twitches/skates when fish are keyed on active egg-layers.

Identification

Key features: Robust stonefly profile with a long, flattened body, strong legs, two tails, and folded wings on adults; nymphs look chunky and built for current.
Size: Large; generally imitated in bigger stonefly sizes.
Coloration: Usually golden-brown to amber, tan, or brown overall, often with darker accents on the thorax, wingcase, or legs.
Similar bugs: SalmonflyLittle Yellow StoneSkwalaBrown Stonefly

Habitat

Water types: RiversFreestone streamsFast rifflesRuns
Substrate: Rocky bottoms, especially cobble, rubble, and boulder-heavy sections that give nymphs cover in current.
Conditions: Best associated with moving, well-oxygenated water where large stonefly nymphs can hold in the substrate.