That RES x BG hybrid is an unusual looking fish. I have read studies that claim 90% or more of the F1's are males.... the hybrid pictured in the middle seems to display some female characteristics, to me anyway.

I have one pond that produces a lot of RES x BG hybrids naturally, but they appear different from the one Bruce shows. I'll look for a pic.

"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.