Crappie can be managed by allowing lots of small bass to be present, although with crappie it takes extra effort, usually a lot of extra effort to always monitor and remove appropriate numbers and sizes to keep crappie from becoming overabundant. A little luck and proper habitat always help grow good balanced crappie populations. Make no mistake, it is dificult. Over time and with lax management crappie very often overpopulate as noted below. Lots of info here about successfully and unsuccessfully growing crappie.
Read through and study this. Ask queations if needed.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92447#Post92447
