The study posted by ewest is confusing. One moment it claims no successful backcrossing in either ponds or laboratory settings, then it cautions pond managers to be aware of the potential for backcrossing.

This apparent discrepancy is explained by the author/s as being due to genetic history of the broodstock used, as well as their geographic origins....I would welcome a little clarification and further detail regarding this statement.

Has there been further study in this area?

"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.