Back calcing for you, to eat 8 BG in the 7"-8" range every other week, you would be harvesting 56-88 lb annually. At a rate of 30% you would need to hold approximately 185-290 lb of BG, which at the 150 lb/acre carry capacity referenced in Bill's post, you are looking at pond of 1.2-2 acres. If you are willing to eat smaller fish at the same rate (say the 5"), you could get away with a pond closer to 0.4 acres. For a pond the size you are talking, you will either need to significantly increase carry capacity (feeding, aerating, etc, and not likely able to attain your goals as stated, IMO) or reduce consumption.
