oldsconv provides a pretty good summary about chain pickerel. It is doubtful that they would successfully recruit new individuals in a pond as small as 0.2-0.5 ac unless it had an attached marshy or boggy area. Although IMO you do not really want the CP spawning and adding new predators because you could easily get too many predators and growth rates will suffer. A pond full of stunted fish is not very exciting. The key feature for growing good quality predators is to have very good control of their density. Fewer predators grow faster and larger and allow a high number of forage fish to always survive and provide a constant source of feeder fish.
Ideas for forage of YP, GSF, GS sounded acceptable to me although I have never raised CP which are likely very similar to a smaller version of northern pike as far as predation behavior. If the pond was balanced correctly, the YP could provide harvestable panfish.
Smallmouth could be an additional primary or secondary predator in a small pond if the proper fish balance was maintained. Although IMO the SMB would likely spawn and recruit new smallies compared to recruitment ability of CP. CP would likely eat a lot of the young SMB so I would not stock very many CP unless the CP is your main interest then the SMB would be an occassional bonus fish. If you stock CP and SMB I suggest that you keep their numbers of both SMB&CP low or else you will have a hard time keeping enough forage in the pond so the predators do not stunt. A few SMB&CP can eat a lot of fish over the course of one year. Figure on 7 to 10 lbs of forage fish eaten per predator per year.
Link to acronyms:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92442#Post92442 
