I�m echoing some of what�s been said here. I have experience managing out greensuns out of two different 1-acre ponds. I added 30 adult bluegills and 10 12� bass per acre.(Gills and bass were already established)
I started a feeding program for the gills after the greens spawned.
I think greens only spawn once while gills will spawn as long as they are fat and happy.
That�s not a scientific observation and may be disputed by the smarter folks on this board.
Over 3 years the gills seem to have crowded out the greens. I also pitched all the greens out I�d catch.
On a rare occasion I catch a natural highbred but no true greens.