I've seen a couple like your first pic in my HBG pond. Due to the time frame involved they could not be F2 or F3 fish that were spawned in my pond, so they had to have come from the hatchery. Or, they were reciprocal crosses, which had to have come from the hatchery also.

They can make decent fish in their own right. I'll see if I can find 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.