Personally, I'd start with 35 HSB, clip the lower lobe of the caudal fin and harvest five of your slowest growers each of the next three years. This allows for 20% annual hooking/natural mortality and still leave you with a dozen or so really nice big fish after three years. Then in a couple of years you can evaluate your water quality by testing and/or visual clues and add a few HSB annually as needed. Trust me...I've seen numerous ponds of your approximate size that did not suffer water quality issues with that many fish.
