Slipbob hit it right on the nose. Crappie seem to like deeper open water adjacent to shallower weeds flats or structure such as points, drop offs, or creek channels. Seems they are almost always suspended up off the bottom. Try different depths till you find them. A sonar though is really almost a must in my mind for icing crappies. Smaller jigs like shrimpos, ratsos, tear drops, genz worms, mini tubes, mini spoons, and the smallest jigging rapala are great tipped with a small piece of worm or better yet a maggot or two.
Tyler