I have a hard time understanding how anyone can have a pure BG, HBG, CNBG, RES, or any Sunfish for that matter, with all the potential infiltration of other species. Seems no matter what you plan out, the potential for something else showing up is pretty high.

.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!