I would keep harvesting every crappie that you catch. With their larger mouth (gape) size, they can eat a LOT of smaller bass that would escape predation if there were only BG in the pond just doe to their gape size vs. BG. By removing a lot of crappie, you are helping the bass population and you might not even have to buy larger bass. Crappie spawn before the bass do, so they are able to eat the smaller newly hatched bass if they can get past Dad who guards the fry for a week or so after hatching.
