Of all the members of the EPT group, caddis are the only family to exhibit a complete life cycle: larva, pupa and adult. The pupal form is the transitional stage between either a shelter dwelling of free living caddis larva and the winged adult. Free living caddis larva only build protective shelters of debris or stones that they seal themselves inside during pupation. Caddis pupa are only available at the time of emergence and in most cases, emerging pupa are the most vulnerable stage of the life cycle that are available to trout.
It has been debated over the decades the theory that caddis inflate their exoskeletons with a gas bubble to emerge to the surface. While I have not seen this phenomenon in person, I have seen tiny flashes of light near the surface of the water like that of the paparazzi shooting a movie star walking the red carpet. I surmise that I was witnessing the glints of light as caddis emerge encased in this so-called gas bubble. Because of this phenomenon, I fish with caddis emerger patterns that imitate this gas bubble to some degree at or very near the surface. When fishing deeper in the water column, I use much less flashy, more opaque caddis pupa imitations because they have not begun to exhibit this gas bubble yet.
I have observed several caddis species whose exoskeleton would exfoliate in the process of emergence. The chitin of the pupal exoskeleton would be somewhat transparent allowing the more colorful adults abdomen to show through. I strive for a colorful yet transparent effects when designing caddis pupa patterns.
From the Green Rockworm to Little Sister Sedge and all the way to the Mother's day Caddis, this gem imitates them all. A semi-realistic, accuraretly proprtioned caddis pupa immitation also immitates the outrigger legs of an emerging caddis.
Give this a workout the next time you need to play the caddis game.
From the Hydropsyche to the Turtle Cased Caddis and other small tannish/yellow pupa, this gem imitates them all. A semi-realistic, accurately proportioned caddis pupa imitation also imitates the outrigger legs of an emerging caddis.
This fly stood the test of durability during last years many caddis fly hatches. Drift it, lift it and swing it. Fish after fish, this pattern withstood the test.
The species of Mother's Day caddis present two stages that are most vulnerable to predation, the prolonged emergence and the ovipositing diving adults. This flymph works at imitating both.