Bluegill can be trapped with traps meeting the 1 1/2" specification. Bluegill are only considered a bait fish when they are less than 5" in length. Bluegill 5" and larger may be used for bait, but they must be caught by pole and line and they fall under the "All other Fish" category for daily limits. Bluegill are considered a game fish in certain lakes. I manage a lake with an 8" length Limit and a 10 fish daily limit on bluegill. Make sure the body of water you are trapping is open to trapping bait fish. Smaller lakes are almost always "pole and line only".