The Chum Fry: How to Tie the Spring Pattern That Turns Puget Sound Into a Feeding Frenzy

The chum fry outmigration is the event that turns Puget Sound beach fly fishing from a patient searching game into an all-out feeding frenzy. Starting in late February and peaking in March and April, millions of juvenile chum salmon, tiny, translucent fish barely two inches long with pink bellies and olive-silver backs, pour out of their natal streams into the saltwater. They school along the beaches in massive clouds, hugging the shoreline where freshwater creek mouths dump into the Sound.

Sea-run cutthroat know the schedule. They stage near stream mouths weeks before the fry appear, waiting. When the outmigration begins, the cutthroat move in and gorge. They slash through schools of fry on the surface, sending tiny fish scattering in every direction. Gulls circle overhead picking off the stunned ones. The water boils. And a small, sparse chum fry pattern cast into the chaos catches cutthroat on nearly every strip.

This is the one time of year on Puget Sound when you don't need to search for fish, the fish come to you. Find the creek mouth. Find the fry. The cutthroat will be there.

What It Imitates

The chum fry pattern imitates a juvenile chum salmon (Oncorhynchus keta) during its first weeks in saltwater. The natural fish is:

• Tiny, 1.5 to 2.5 inches long
• Translucent, the body is nearly see-through, with a visible silver belly
• Pink-bellied, the yolk sac gives young chum fry a distinctive pinkish-orange tint underneath
• Olive-backed, a subtle olive or gray-green back for camouflage from above
• Schooling, they travel in dense schools of hundreds or thousands along the beach

The fly needs to be small (#6-10), sparse (the natural fish is nearly transparent), and have the right color profile, silver/white belly, hint of pink, olive or gray back. Overdressing is the most common mistake, a fat, bushy chum fry looks nothing like the wispy, translucent natural.

The Recipe, Simi Seal Chum Fry

The Recipe, Classic Bucktail Chum Fry

How to Tie the Simi Seal Version, Step by Step

Step 1: Weight. Wrap 8-10 turns of lead-free wire on the shank, leaving space behind the eye for the head. The chum fry pattern needs just enough weight to break the surface film and sink slowly, it's not a bottom-bouncing fly.

Step 2: Tail and wing. Take a small pinch of Chum Fry colored Simi Seal dubbing and tie it in at the bend as a tail, extending about one shank length past the hook. This forms both the tail and the upper wing of the fly.

Step 3: Belly. Dub your thread with silver or white Simi Seal and wrap a slim underbody forward to the wire. This creates the translucent silver belly of the fry.

Step 4: Back. Add a thin layer of Chum Fry dubbing on top, just enough to suggest the olive-pink back. Taper it toward the head. Less is more, the natural fish is nearly transparent.

Step 5: Belly accent. If using a separate smolt belly dubbing, add a small amount underneath for the pinkish belly tint.

Step 6: Eyes and head. Attach 3-4mm holographic eyes with UV resin. Build a small, clean head. Cure with UV light.

Step 7: Optional parr marks. Use a fine-tipped black permanent marker to add 6-8 vertical bars along the sides. Real chum fry have these marks during their first weeks, it's a small detail that can make a difference on pressured fish.

Step 8: Brush out. Use a velcro brush or bodkin to pick out the Simi Seal fibers. The finished fly should be wispy and translucent, not dense and opaque.

Where to Fish It

• Puget Sound Beaches, WA, Every beach with a creek mouth is chum fry water in March and April. The south Sound (Titlow, Dash Point, Henderson Bay) gets the earliest outmigration. North Sound (Carkeek, Meadowdale, Picnic Point) follows in April. Hood Canal is the holy grail, the canal's chum runs are massive, and the fry outmigration is correspondingly huge.

• Hood Canal, The densest chum fry concentrations in the region. Position yourself on the down-current side of a creek mouth and cast into the fry schools. Cutthroat stack up here for weeks.

When to Fish It

The chum fry outmigration has a predictable calendar:

• Late February–March: Early fry begin leaving streams. Cutthroat stage near creek mouths. The fishing builds day by day as more fry enter the salt.

• March–April: Peak outmigration. Millions of fry in the nearshore zone. Cutthroat feeding aggressively, often visible on the surface slashing through fry schools. This is the prime window, the best two months of the year for Puget Sound topwater and near-surface fishing.

• May: The outmigration tapers off. Fry disperse into deeper water. Cutthroat transition to sand lance and herring patterns. Switch to Clousers and Deceivers.

The Outmigration, Understanding What's Happening

The chum fry outmigration isn't a single event, it's a rolling wave that moves through Puget Sound over 8-10 weeks. Different streams produce fry at different times depending on water temperature, elevation, and when the adults spawned the previous fall. South Sound streams (Nisqually, Skokomish, smaller tributaries around Olympia and Shelton) tend to produce fry earliest, late February into March. Central Sound streams (Duwamish system, tributaries around Seattle and Tacoma) follow in March. North Sound creeks (Snohomish, Skagit tributaries, Whidbey Island streams) produce fry into April and May.

This means the fishing moves north as the season progresses. An angler who follows the wave can fish chum fry patterns for three months straight, working new beaches as each stream system begins its outmigration.

Hood Canal is the epicenter. The canal receives some of the largest chum runs in the region, the fall chum runs up Hood Canal rivers are legendary, and the corresponding fry outmigration in spring is proportionally massive. The canal's narrow geography concentrates the fry along the shoreline, and the cutthroat that winter in Hood Canal don't have to travel far to find them. Some Hood Canal beaches produce chum fry fishing so consistent that anglers mark their calendars a year in advance.

It's not just chum. Pink salmon fry outmigrate on a similar schedule in odd-numbered years, and chinook fry trickle out of larger river systems throughout the spring. Cutthroat eat all of them. The chum fry pattern works for any juvenile salmon, the size, profile, and behavior are similar enough that the same fly covers all species. But chum fry are the most abundant, the most concentrated near creek mouths, and the most predictable in timing, which is why they define the fishery.

The connection to the Puget Sound fly fishing calendar. The chum fry hatch bridges the gap between winter fishing (slow, deep, shrimp patterns) and summer fishing (sand lance, herring, Clousers). It's the event that wakes up the cutthroat population after the spawning season and concentrates fish in predictable locations. March and April are when the most cutthroat are in the best condition, fresh from spawning, hungry, and stacked up near food. If you only fish Puget Sound two months a year, fish the chum fry hatch.

How to Fish It

Find the creek mouth. The chum fry pattern is a location-specific fly, it works near stream mouths where fry are actively outmigrating, not on random stretches of beach. Use a map to identify creeks that support chum salmon runs, then fish the beaches on either side of the outflow. WDFW's SalmonScape database shows which streams support chum populations.

Look for the signs. Diving birds (gulls, terns, cormorants) working close to shore means fry are present and being pushed to the surface. Swirls and splashes in the shallows mean cutthroat are feeding. Cast to the activity. Sometimes the fry themselves are visible, shimmering clouds of tiny silver fish in the shallows, scattering when a cutthroat slashes through.

Floating or intermediate line. The fry swim in the top 2-3 feet of water. A floating line with a 9-foot leader works when fish are on the surface, which is most of the time during an active outmigration. Switch to intermediate when cutthroat are feeding just below the surface and ignoring topwater presentations.

Short, erratic strips. The natural fry dart and scatter when a predator approaches. Imitate that panic, short, 4-6 inch strips with quick pauses. The fly should look like a fry trying to escape, not a baitfish cruising lazily. When cutthroat are actively feeding through a school, a faster, more erratic retrieve outperforms a slow one, the fish are in kill mode and want something that acts scared.

Position on the down-current side. Fry drift out of the stream mouth and are carried by the current along the beach. Position yourself down-current from the creek and cast up-current, your fly drifts naturally with the fry school. The cutthroat patrol this current seam, picking off fry that get separated from the school.

Work the tide. The outgoing tide pulls fry out of the stream and along the beach, this is prime time. As the tide drops, fry concentrate in the remaining deeper channels near the creek mouth. At dead low, the fish may stack up in surprisingly small areas. Incoming tide pushes fry back toward the stream mouth and spreads them out, the fishing gets more scattered but individual fish may be less pressured.

Fish early. The best chum fry fishing happens in the first two hours of light. Cutthroat feed most aggressively at dawn when the fry are most vulnerable and before beach foot traffic pushes fish off the shoreline. On weekdays, you may have the creek mouth to yourself. Weekends at popular spots can get crowded, arrive before sunrise.

Don't overlook the Woolly Bugger. When cutthroat are feeding on chum fry but refusing your fry pattern, which happens when they've seen too many flies, a small olive Woolly Bugger (#8) stripped through the fry school often produces. It doesn't match the fry, but the commotion of the retrieve through the school triggers reactive strikes from cutthroat that are already in feeding mode.

How to Tie It, Video Tutorials

Spawn's version: Easy Chum Fry Pattern for Puget Sound, Spawn Fly Fish's simple Simi Seal version using their Chum Fry dubbing color.

The Chum Baby: Puget Sound Chum Baby tutorial, A popular bucktail-and-flash variation that's been catching cutthroat for years.

UV Resin version: UV Resin Chum Fry, A durable, epoxy-coated version that holds up to multiple fish.

Tips From the Vise

Sparse, sparse, sparse. The #1 mistake with chum fry patterns is overdressing. Real chum fry are nearly transparent, you can see their spine through their body. Your fly should be wispy enough to see the hook through the materials. If it looks thick in the vise, it's too thick.

Match the size. Chum fry are 1.5 to 2.5 inches long. Your fly should be the same, a #8 or #10 hook with materials extending to about 2 inches total. Oversized fry patterns get refused by cutthroat that are keying on the real thing.

The pink matters. That subtle pink-orange tint in the belly is what separates a chum fry from a generic baitfish pattern. Use Simi Seal in the Chum Fry color (which has built-in pink tones) or add a few strands of pink flash under the belly.

Fly images courtesy of Spawn Fly Fish and Pacific Fly Fishers.

Build Your Box

• Simi Seal Chum Fry #8 (8), the modern standard
• Simi Seal Chum Fry #10 (4), for smaller fry early in the season
• Classic bucktail Chum Fry #6 (4), for bigger water and coho

That's 16 flies, enough for the entire March-April season. Tie them in February so you're ready when the first fry hit the salt. The chum fry outmigration waits for no one, and the cutthroat won't either.