Take a look here to help understand relative weight, and how it can help you determine how your fish measure up: http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=160456#Post160456

There's never a need to poke holes in a fish to weigh it. Simply suspend it in a plastic bag, like you get at Walmart. Or use the tare function on a digital platform scale, and lay the fish in a tray of some kind.

"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.