My favorite crawfish pattern--

Weight: clouser style
Body: root beer estatz
tail: brown marabou
attenae: copper crystal flash, left a little long

I like to use a #4 mustad baitsaver hook on this; it has a nice short shank and hooks extremely well. The root beer body on this fly looks surprisingly realistic crawling over a rock. Most of the smallmouth writers say that fish prefer softshell crayfish without pincers. I am no expert, but this fly did account for my biggest riverine smallie (18").

Russ