MNFisher, Alpha is right on - you need them to keep the small bluegill thinned out. The single biggest key to growing giant bluegill, even more important than supplemental feeding, is a high density of predators. The pond that all of the fish today came from is under an acre, and I've stocked over 200 largemouth in it in the four years I've been working with it. It also has two tiger muskie that were stocked at 12" each in December 2009. I'm guessing they're slightly larger than 12" now.