Check out this killer pupa pattern tied by our friends at In The Riffle. It is a Caddis Poopah emerger that can be tied in two main colors – Brown and Olive. This pattern is best fished on a nymph rig setup with the Caddis Poopah as your lead fly. An emerger is a pupa that is changing in to the adult life stage of the fly. As it sheds its casing, the top of the emerger starts to show its body and wings. It rises up through the water column to the surface to complete its transformation to an adult caddis fly.