It all depends. You should hear that a lot here. Every pond is different as are fish populations. There is some commonality based on biology and mother nature's rules don't change. Every pond has a carrying capacity limit which studies have shown usually fills to its "normal capacity" in 2-3 years. That is why stocking fish happens once in a new pond. For example in a BG/LMB pond you don't stock 1000BG and 100LMB pre acre every year you do it once. Absent a biologic change in the system ( like starting a feeding program or a fertility increase) from that point on it is about managing the populations to get to your goals. You may add some fish and take some out and some will die and others will be born and grow but the lbs of fish per acre carrying capacity stays rather constant.

If you want a balanced LMB/lepomis pond GSF are not the best choice. GSF take up carrying capacity like a BG (size/weight) but are much less productive as forage. By far in the south the most common problem in pond fish populations is stunted LMB (8-12 in) due partly to not enough forage even when stocked with BG. The BG simply can't alone reproduce enough to sustain the LMB. Given that even BG are often not productive enough to sustain a balanced LMB pond why take up carrying capacity with a less productive alternative in GSF. It is contrary to the goal.

Further lepomis and their hybrids are born and grow quickly until they reach the point where energy is diverted to reproductive activity at which point growth slows to a low rate. They are genetically wired to reproduce ASAP to preserve the species absent a suppresser (like a pond at carrying capacity or in BG the presence of large male BG). What does this mean ? Because in a new pond GSF don't produce enough offspring to sustain the LMB few if any get big (they are eaten), therefore the remaining GSF are wired to become active as reproducers quicker and thus they exhibit very low growth. That is why most LMB ponds with GSF have GSF populations made up of mostly small (less than 5in)GSF which are struggling to survive as a population and are reproducing as fast as they can and not getting bigger. That goes on for a while until the GSF population can't withstand the pressure and you end up with some small GSF and a lot of skinny LMB eating everything in sight. In addition studies show that LMB will eat GSF first over BG because of their shape and the gape limit of the LMB. So even larger GSF(say 6 in) are eaten by LMB before smaller BG (say 4in ). The GSF remain subject to predation much longer than the BG due to shape and size. Generally speaking because this scenario has gone on for millennia GSF have survived and adapted and genetic selection has selected for small size and quick reproduction in most populations. DIED may have a GSF population which has not been subject to the normal genetic selection process or they may have some other genes mixed in. One other point - some Fisheries Scientists who do research on lepomis believe it is getting harder to find pure GSF and thus they see wider variation in test results on growth and fecundity. The point being you may not be able to find a hatchery with them or they may not be quality GSF. Most hatcheries don't carry GSF.

That is what is the most common outcome. Can there be exceptions - yes. Can you count on being an exception or manage to that outcome. I don't know. I generally don't bet against mother nature unless I am willing to suffer the loss. Most pond owners don't want to take that risk and therefore it is not recommended by fisheries managers. If you want to take that risk with your pond with the information available, I say go for it - we will try to help- keep us updated so we can learn along with you.