Welcome to the forum eyedoc1!
OK, here are my concerns... First, if you had a long delay between the sunfish stocking and bass stocking, and there was a green sunfish(GSF) contamination, many of the GSF could have put on some size before your fingerling bass were stocked. This leads to expensive fingerling bass going into the bellies of GSF! The GSF may or may not have cleaned your fingerling bass out. By this time, you should be seeing some bass in the pond...
How to fix the problem...
TRAP NET THE CRAP OUT OF THEM! Here is a fine
EXAMPLE of what can be done to a GSF population with a trap net. You can purchase a trap net
HERE. They are a hair pricey, but trust me they are WELL WORTH the investment and can be used for years to manage your pond in numerous ways...
Next you need to find out if you have any bass left in your pond... The trap net is indiscriminate and will trap all species of fish. You should get a good idea what the percentage of each species is in your pond and if any bass are left... Simple remove the wanted species and release them and keep the nasty GSF and turn them into catfish bate, fertilizer or what ever you chose to do with them.
Once you have figured out if you have bass, you can decide on additional stockings. If you find you have no bass, I would consider stocking advanced largemouth bass(LMB) at about 30 to 50 per acre. Advanced LMB being bass 10" or larger. These additional bass will immediately put the fear of death in all those little GSF and begin eating them with gusto. LMB can more easily feed on GSF as opposed to redears(RES) or bluegill(BG) because GSF have a more fusiform shape and hence fit down a LMB's mouth easier...
Personally, I think the MDC biologist gave you bad info on letting the sunfish go that long without bass predation. Maybe in Texas or Florida, but Missouri, you're asking for stunted BG and the mess you ended up with which was GSF getting a foot hold. Also, it may not be the fish suppliers fault the GSF are in your pond... GSF have amazing abilities to use high water events to make new ponds their home. However, GSF are often hitch hikers with fathead minnows(FHM), golden shiners(GSH), BG and others.
The trap net will be a great service in letting you know what you have in your pond and where to go. If you do find you have some bass, try to see what size they are and an estimated abundance. That will dictate if you need to stock any and if so, how many...
Don't panic, this is a slight set back, but a couple years of increased bass predation on the GSF and they will slowly become a negligible percentage of your pond community. You may also need to stock additional BG and RES depending on you trap net findings.
Best of luck!
