Perhaps, but you may simply not be "tuned in" to that advantage. A peacock's tail is a definite disadvantage for an individual peacock's survival. But as S.J. Gould has pointed out....
Originally Posted by tofu
"Our world overflows with peculiar, otherwise senseless shapes and behaviors that function only to promote victory in the great game of mating and reproduction. No other world but Darwin's would fill nature with such curiosities that weaken species and hinder good design but bring success where it really matters in Darwin's universe alone -- passing more genes to future generations."
As to halibut, I'm not really tuned in to their particular evolution. I think Delvo makes good points.