My 16 yo brother likes to fish on the pond on our newly aquired land. However he wants to catch bass and there's only a shit load of crappie and some catfish in it. I recently learned that crappie are the niggers of pond ecosystems, and it's impossible to breed catfish and bass in the same pond where there are many crappie. There are many methods for removing crappie but those methods will harm the catfish my brother wants to keep.

We can't go electrofishing because it affects catfish more than crappie/perch.

My solution is to use our seine line + boat + feeding pellets to draw in fish to a certain place, net them up, then sort out the catfish from the nigger crappie. Then repeat this process in quadrants until the pond loses most of its' crappie population.

Though the seine net genocide method is the most effective it is very time consuming. Is there any way we can genocide the nigger crappie without using as many resources? I know I can't completely destroy the crappie population, though I do want to limit it extremely so bass and catfish can grow.