Sgt911 have you tried doing a seine survey to see what is going on. Do a history of the pond including what you stocked , when and size of stockers, water quality, other things you have noticed and post that . It should be an interesting situation.

htrangler here is the link to the threads on crappie.

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=5;t=000461