HBG can mean durn near anything. Any fish that has BG somewhere in its lineage is a HBG. Most folks mentioning HBG mean the result of a cross between a BG and a GSF, and in my experience with this particular cross, the young fish often have a reddish tinge to their fins.

But, like nearly everything else having to do with HBG, there are variances. I have seen young hybrids with white or yellow borders.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.