I doubt that WE would manage the YP in a set up like that alone. In a 0.25 acre pond, I'd stock pellet trained YP. As has already been said, in a pond that size you could manage the YP yourself with fishing, egg manipulation and possibly trapping. A couple dozen SMB could be added to help manage the YP. They are unlikely to successfully spawn in the described conditions and can be removed and restocked when they become too large for their intended purpose. Pellet trained YP would be key for such a small pond IMO though. Must be some very steep sides to be so deep but only a quarter acre.
