Crappie in a pond are difficult to manage, and you will be spending a lot of time managing them. If they aren't in your pond now, please do a lot of searching and reading before introducing them to it.

It's mostly because of their "boom or bust" spawning cycle, and because they spawn before LMB.

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).