Fly Tying: June, 2018

Silvey’s Caddis Pupa


It would be a shame if each of us did not make it over to the Deschutes sometime during the trout season. In fact a number of trips would be more to the point. Dave Hughes refers to the Deschutes as his “river of renewal”. I know that, for me, just catching that first glimpse of the river on each and every trip never fails to lift my spirits.

When the salmonflies and golden stones have finished their annual show on the Deschutes it is time for anglers to move on to the insects that fill up the rest of the trout season. Some of the more dependable hatches involve caddis flies, with hatches that can often be very prolific, and at times almost mind-boggling. I recall one evening getting off the river at Beavertail with Gil Henderson after a day of fishing. As we loaded our pontoon boats piggyback style onto the top of his GMC Yukon, it was all we could do to keep from inhaling the swirling snowstorm of caddis flies that surrounded us during an epic hatch.


Caddis flies undergo a complete metamorphosis which involves the following stages:
egg —–> larva —–> pupa —–> adult

A commonly used larva pattern is the basic Green Rock Worm, which can also be tied in different color variations depending on the caddis species. A reliable go-to dry fly pattern for the adult caddis is Al Troth’s Elk Hair Caddis. But what do you use for the pupa stage, when the insect is transitioning from a stream bottom dweller to the flying adult insect? One pattern that has gathered a lot of fans is Brian Silvey’s Caddis Pupa. I came across a Youtube video of Jason Osborne from Northwest Flyfishing Outfitters where Jason mentioned that if he could only use one fly on the Deschutes it would be Silvey’s Caddis Pupa. Of course we are not just talking about a fly that is only to be used on the Deschutes, as caddis flies are more numerous and widespread than mayflies in western rivers and lakes. In one of his recent newsletters Joel La Follette of The Royal Treatment Fly Shop mentioned Silvey’s Caddis Pupa as one of only a couple of flies that he would not go anywhere without.


So what is it about Silvey’s Caddis Pupa that makes it so effective? Mark Bachmann of The Flyfishing Shop seems to think it has to do with the body material called “pearl core braid” that Silvey started experimenting with a number of years ago. As the pupa is emerging air bubbles develop between its layers of skin helping the emerging insect rise to the surface. The pearl core braid material used in the abdomen does a very good job of simulating the reflective appearance of the bubbles. And the pearl core braid comes in a range of colors that can be used to imitate a variety of caddis species.

You can fish the Silvey’s Caddis Pupa any number of different ways.  You can nymph it, fish it on the swing, or fish it as a dropper.  Casting it out in the current and then letting it swing and rise back toward shore does a good job of imitating a natural pupa rising to the surface to emerge as an adult. Brian Silvey says his favorite way is to fish it as a dropper under a dry fly.


Join us at the Royal Treatment Fly Shop in West Linn for our next Fly Tying Night on Wednesday, June 27th to tie up some Silvey’s Caddis Pupae. As always we will be starting at 6:00 pm. Hope to see you there!

(Note:  We will be taking a couple of months off from fly tying.  This will be our last Fly Tying Night until we start up again in September.)

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