I stocked 6 in a clients .78 acre pond. He had a problem with way too many 8" goldfish.

That was 4 years ago. He still has a goldfish problem, and at least one is still in the pond - it was seen recently. But, the pond is a community pond, and it is open to the public so it is hard to manage.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).