Once the CC get over 3# they turn to eating fish. It's not a magic number, and they probably will eat the GSF before reaching that size, it all depends on other food sources in the pond and if the GSF are small enough for them to eat.

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).