Hello, eyedoc, and welcome to the Forum.
Please give the numbers and sizes of each species (supposedly) stocked.
GSF make great bass forage, short term, until their numbers have been lowered. After that, their lower spawning rates wrt BG keep them in unobtrusiveness. The few GSF left can grow to a respectable size; several of our members have trophy GSF ponds and love them. If a decent number of bass are stocked, they can grow and get fat on the Greenies.