I remember this one:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Main=22044&Number=279559#Post279559

and this one:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=291973&page=1

Both threads reference the learning ability of fish, but I don't know if either one is what Bill is thinking of.

"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.