A:
Spinner blades appeal to several of the fish's feeding mechanisms. The vibrations they give off can be sensed through a fish's lateral line, that radar-like organ that enables fish to detect the location and size of prey even in low-light or no-light conditions.
Color is another trigger, and today's spinner blades come in a virtual rainbow of color combinations. Blades also can give off sound, which is another way fish locate food. And when tipped with live bait or sprayed with an attractant, a spinner rig also provides a scent trail fish can follow.
Spinner-type baits seem to work best in bodies of water with good populations of fish or with very aggressive fish. Bass and pike are two examples of fish that can, under the right conditions, be very aggressive feeders and thus are very susceptible to flashy bladed baits.