I might be outta line because I haven't seen the lake, but I think that if all the fish that you stocked survived predation, you have enough per acre. The key is survived.....

http://jmmaloneandson.com/TriploidGrassCarp.html

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).