If you only put in limited #s of BG into a pond with established GSF then adding a few more adult BG is a good idea. It will insure that more adult BG are alive and spawning. Here is some info on fecundity (possible reproduction) of BG and GSF.
From Efish
http://web1.cnre.vt.edu/efish/families/centrarchidae.html BG
Reproductive Habits:
· Mature at age 1 or 2
· Spawning occurs May to September
· Males build colonial nests in shallows on sand or gravel
· Females spawn several times a year
· Fecundity is about 80,000 eggs per female per year
GSF
Reproductive Habits:
· Mature at age 1 or 3
· Spawning occurs late May through July
· Males build nests around vegetation
· Fecundity is 2,000-10,000 eggs per female per year
· Hybridizes with many other sunfish species
From the #s of eggs you can see why BG have a reproductive advantage.
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