I might as well go for broke and shoot for the moon:

A local hatchery that could, and would, accurately sex their fish and gladly sell me all male BG, and all female YP.

Bonus points if the above-mentioned hatchery would successfully feed train RES, and could readily grow them out to a larger size.

And in the all fantasy realm, a Blue Tilapia subspecies that could over winter in my ponds.


"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.