From what you're saying about the size of the CNBG in the BOW, I'd follow George's recommendations in regards to culling. You might want to get in touch with Bob Lusk and see what they are doing at Richmond Mills.

He'll be at the Pond Boss Conference in 11 days. There's still room if you can make it.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).