White bass prefer to spawn in rivers, they often go miles upstream where they spawn at the base of a dam. Their eggs are adhesive and sink to the bottom where they attach to rocks. In some lakes, white bass are able to successfully spawn on wind blown shorelines, but this is extremely rare. In an 8 acre pond, I would be very surprised to see white bass naturally reproduce. So it sounds like your buddy will have a handful of white bass for a couple of years til they die out and then they'll be over with. He may grow some nice sized white bass though before they do die off... I would be more worried about other species that came in during the flood event, not the white bass...
