There are lots of ponds with nothing but LMB which Dave Willis has noted on the Forum before and has been discussed on several threads. In those ponds there are many small LMB and almost always a couple of large LMB that managed to jump the size bottleneck. The big LMB eat smaller LMB which eat the very small LMB which eat bugs, and other small food sources. Rarely are these healthy well-conditioned fish populations.

In order to establish BG populations in such ponds you need to remove LMB and stock advanced sized BG (5 inch +) in amounts (depending on pond productivity and LMB removal) of between 250 - 400 BG per acre. Be sure you have around 50/50 male/female BG stocked. Be sure to habituate the BG (see threads on this topic) to help insure initial survival.