just a quick thought since I can't sleep anyway

When saltwater fishing we often use a sabiki rig to catch bait. These include pinfish/menhaden/blue runners etc.."panfish" sized bait. For those that have never seen one it is rig with a weight on the end with six or so shorter lines off the main line. To these branches are hooks which are usually "dressed up" to look like smaller prey, basically like little flies that you would fly fish with. We use this rig to catch a lot of bait quickly, optimally six or so at a time.

So my thinking is that if you had a pond that was overpopulated with small bluegill, this would be a fairly rapid way to catch a bunch at a time. Cast out the sabiki, work the rig across the pond, catch a bunch at once, cull and repeat.

Hints if you decide to try this

When you reel in your angry hoard of panfish grab the weight with one hand and place the rod in a rod holder. Then take a dehooker and remove each fish by letting them fall into their respective buckets (one for cull, one for keep) By placing the rod in a holder and stretching the rig out like x-mas lights you can avoid getting hooked yourself, and you never have to touch the fish. This would be a bonus because you wouldn't remove the protective slime coat from the keepers.

Once you get a strike, let the little guy stay hooked for a few seconds before reeling in. His strike will attract others to the now wildly "dancing" other flies. You may want to add a tempting morsel of bait to each hook as well.

Doing this on your on pond would probably be ok, but not sure about legalities otherwise

I realize this does not sound very sporting, but it may be an option for removing a bunch of fish in a short time, somewhere between regular hook and line and using a large net.

Crazy?