Even with keeping 50, considering how many anglers there are fishing public water now, it does not take long for a water body to get fished out of large bluegill. Note the studies I linked to in Michigan and Wisconsin, in which multiple large lakes had up to a third of all of the bluegill over 6"removed within two months of being opened to the public - and that study was done in the '80's when there was a lot less pressure on public waters than there is now.