#8 brown woolly worm, with a shot of crayfish scent on it. As charlie said, put it a couple feet upstream of a feeding carp and hold on. They are feed as much by scent as by sight. Was catching them on flies decades ago, before it became a fad. Many times had some fun on an otherwise slow day by looking for carp and casting a little woolly to them. Of course we were unable to see the future and had no idea anyone would ever care about catching them.