
If you mean a dry fly setup, these are the strongest surface options in the set. The caddis patterns are the most broadly useful: The Fly Crate Foam Caddis rides high and is a good general-purpose trout dry, while The Fly Crate Missing Link Caddis is better when trout are picky about crippled caddis. The Fly Crate Fattest Caddis is another buoyant caddis option for keeping the fly visible and floating well.
For mayfly hatches, Big Y Fly Co Harrop's CDC Biot Emerger BWO - Solitude - Mayfly Dry Fly is best when trout are feeding in the film, and Big Y Fly Co Harrop's CDC Biot Dun PMD - Solitude - Mayfly Dry Fly is a strong choice for PMD surface feeding on technical water.
Switch away from a dry fly if trout stop showing on top, if the hatch is mostly subsurface, or if the water is too rough to keep a clean drift. In those cases, an emerger, nymph, or streamer presentation will usually outfish a standard dry. If trout are refusing caddis but still feeding, the The Fly Crate Missing Link Caddis is the first dry to try before changing tactics.
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