WRF, if I decided to stock LMB in a pond that size, I would consider a very limited stocking of females only. They can grow quite large if the numbers are controlled and no spawning.
HSB are really hot right now, so maybe the guys that have those will chime in.
But before I did anything, I'd want to know what was already in the pond. Do you have any history on the pond itself? Fish caught, drought, potential flooding, etc. Maybe a fun day of fishing, or a seining would let you know where you're already at and give you a better starting point.
This is a 2 YO that snuck into my 1/5 acre CNBG pond. There were 5 females only in that pond, and they all looked like this.
