All ponds are different but my pond is five acres and it was very overcrowded with 8-12" bass. I started taking them out in January of 2008 and have removed 185 8-12" bass since then. At first I took out any fish under 12".Now that they have started putting on weight and lenght I cull by the individual fish. If its fat and healthy no matter what lenght i throw it back. If its under weight I take it out. I would think around 175-200 bass would be around the number that needs to be taken out.