Spent the best part of my early years fly fishing for trout. I also tied my own flies which looked as close to known patterns as my lack of skill would allow. There were days when the fish were actively feeding and rejected anything that didnt closely match both size and color of the occuring hatch. The fish would smack a bug less than a foot away fom the fly I was fishing and mine would float on unscathed. That said those days were few and far between. Most cases there didnt seem to be a specific hatch occuring and you could throw anything out there and they would hit it. Dont know what a wooley bugger or a hares ear is supposed to mimic but they worked 90 percent of the time.

its hard for me to imagine a crappie being as sophisticated as a trout in a river, a trout that has to rely on itself alone for its survival rather than the safety of a school. There is also the reality that competion in the school itself that probably triggers bites even when theowing a lure that looks like nothing the fish have ever seen.