Photo: Tied for fly fishing. Naturalist Observation, c. 1912.
Fly pattern

Rockerka

Czech champion Luboš Roza's signature CDC dry fly. Tied with a segmented body and a thick wing of CDC feathers, it mimics a skating caddis or egg-laying adult and can be active-retrieved (skittered) or dead-drifted.

Key points

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CDC Wing: Delivers exceptional natural floatation and realistic leg movement.
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Skating: Highly effective when retrieved actively across the surface tension to create a wake.
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Micro-triggers: Features subtle hot spots (often a tail tag) to attract picky trout.

Tying videos

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Tying Luboš Roza's Rockerka — competition dry caddis tutorial.

Imitates

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caddisflies — adult egg-laying or emerging caddis.

Related

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corn fed caddis — modern dry caddis alternative.
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elk hair caddis — classic caddis dry.

Sources

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Czech Nymphing Dry Fly Selection — tying video.