Ponch7672,
I recently dug a pond (3/4 - 1 acre). Ironically, my goal is just the opposite of your specific situation. I really want to stock crappie (black) in my pond along with bluegill, and LMB. How deep is your pond? I have heard many times of how crappie can over populate ponds and their offspring get really stunted. What specific did you do (feed?) to aid them to get 13"? Did you provide any type of habitat for your fish?

Dex