Stoney Creek Fisheries recommends a maximum of 1,000 total game fish per acre, assuming the pond is in good shape and aerated. If not, then stock less. The key to a healthy fish population is to (1) avoid over-stocking, (2) manage your pond to avoid over-populations and (3) maintain a sensible ratio of predator to prey species. Remember an aerated pond can support more fish than one without aeration.