CDC Caddis Olive, size 16 (CLOSEOUT) CDC flies (Cul de Canard) were originally know in the Swiss region of Europe as Moustique patterns since the early 20s. I came across these patterns in the early seventies while fishing mountain streams in Bavaria. As with many patterns there are an endless number of varieties. I found these patterns to be effective on both ponds and stream. Grease this fly and it will float like a cork. You'll receive 6 pcs. in a size 16 tied on Daiichi 1110 (oversized straight eye).