The larger sizes are less susceptible to transport stress. If you stock 2 different sizes, Just clip a pelvic fin off of each size. For instance, left one on one size and the right one on the other size. That way you can track growth rates.

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).