BGK- no need to experiment:
http://forums.pondboss.com/ubbthreads.phpubb=showflat&Forum=5&topic=000199&ngNumber=8&site_id=1:)
My experience for HSB to control CNBG over population - stock minimum 100 HSB for Bud's 1/2 acre pond - create "stocking ladder" following fall to replace morts.
Add adult female LMB 3rd year if necessary.
Never had a fish kill in un-aerated 1/4 acre pond in 8 years - grown some really nice HSB...