He sets the bait so it's slightly off the bottom, from a few inches to as much as halfway up, depending on where the fish want it. Sometimes, it helps to have bait bouncing on the bottom, right on the beds, especially when 'gills are defending their beds. With the trap thus set, fish can get the bait in their mouths easily, and even the slightest bites are detectable--just a tiny tug pulls the float under. A lift bite, when the fish rises in the water with the bait in its mouth, is also easily noticeable because the float rises or lays flat. Sensitive float rigs catch bluegills lightly in the lips. Seldom do the fish swallow the hook.