To many predators for the size of the pond and not enough forage. It takes a carefully designed plan to stock advanced stocker fish. For example a standard BG/LMB plan using 2-3in fish uses 1000 BG and 100 LMB per acre. If you use 4-5 in BG and 4-6 in LMB (stocked later) the numbers are about 250 and 25. You have to leave carrying capacity for the fish to grow into. In the alternative you can have a put and take pond with adult fish and limited recruitment. That number of advanced LMB will eliminate your BG. The one thing that is a big mistake is to have your LMB eat your breeding stock BG. Without the BG you have no forage to sustain the fishery unless you are constantly replacing them.