I would say that if there are fish already living in the pond, that bass and/or crappie could survive. I'm not a biologist by any stretch - so anyone here feel free to correct me on this - but one concern I would have is oxygen content of the water, if it's choked with weeds and shallow, fish may have a hard time surviving winters or even harsh summers as well. I would pick up as much literature as you can find and start reading up honestly. Try looking for Forrest Wood's book on making bass fishing ponds.
Otherwise - here is a link I had saved awhile back, cruise around some of these articles and maybe you'll find an answer.
http://www.bassresource.com/fish_bio...ng_a_pond.html