At times, especially when covering water by trolling or swimming a lure—or in stained to dirty water—a small spinner blade on any lure or jig can trigger many more bites. Also, when I discover crappies are feeding on small shiners, shad or baby panfish, a Road Runner bladed jig or even a small spinnerbait will often out fish non-bladed baits by wide margins. Conversely, in extra clear water, I've found that the addition of a spinner may spook fish. Most of the time, however, crappies key on the flash of the metallic spinner blade and track it via underwater vibration.