When they are shallow and you can find them. Red worms will kill them. I use a thill mini stealth MS-2 1/32 float or smaller with a ice fishing jig and 4# test. If you use a jig(very small) the weight is all on the jig and if the bluegill hit the bait and come up your float will lay on its side and you set the hook. This is about the best float ever for shallow water and it will show all bites. When you throw the bait out and a gill hits it on the fall but doesnt run your float will twitch. You can really learn from watching. The key to gills is often the smalles lure. Crimp a real small piece of shot to the hook or get a ice spoon or jig in size 12.
I fished for many years with bare jigs and have to say red worms catch 3-4X as many fish and require less added lure action by you.

Custom jigs and spins
Turner jones jigs
or make your own.

Turner make a little #16 1/500th oz jig that will kill anything even little 1" long gills. They really come throught when needing catfish bait fast.