I have caught Kentucky, smallmouth, bream, and largemouth on this fly. Sometimes, I used ginger hackle. I may even use Golden Pheasant tippet fibers for the tail or wing.
The body is made of small pale yellow chenille. The wing and tail are yellow mallard side bar feathers (or something like that). I based this off the Yellow Hackle fly in "Fly Tying and Fly Fishing for Bass and Panfish". That and I find yellow to be used on a wide array of flies in that book . . . and I find it effective with lures too.
I ahve had fish come out of hiding and even chase this into the shallows. I use this as a minnow pattern. The fly shown is tied on a size 8 and I even use 10.