I have to agree with Castwell. The plastic mini-crawfish (3" and below) work the best for largemouth. They are weedless, cheaper than "real flies" and the action you can give them on a fly rod is outstanding. For river and smallmouth fishing a lighter (weight wise) craw fly works well with split shot up the leader. Use a nymph or dead drift method on these. The bucktail craw fly would do nicely. But don't over look the virtues of soft plastic on a fly rod.