I have a five acre pond that I usally fish around once a week. It only took the fish about a year to figure out most of my tricks. Every now and then I can try something new and catch a good many but most of the time I fish all day just to catch a few fish. They learn alot quicker than people think. I tag alot of my fish when I catch them and record what I caught them on. I rarley catch the same fish on the same lure twice. You might think that all those people your letting fish are following your rules but they are probably keeping every thing and will fish the pond to death till they have cleaned it out. You might want to think about cutting out some of the fishing.