Can you define start and finish, RC? As in time spent building the nests, or time spent guarding the fry until they are on their own? Water temps play a role, as cooler temps will drive the males off while building nests. The eggs will hatch in just a few days, again depending upon water temps. The fry will remain on the bed under the male's protection for another few days.

Females spend very little time on the nest.

"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.