Imma gonna tell you sort of the same thing I told my friend who insisted that the fish in her tank was swimming upside down and weird because the fish "wanted us to know" that it was pregnant.
Fish don't really give a hoot whether you know about them or not. I don't even think they know you exist, let alone that they would get in a group to warn the humans of the upcoming apocalypse.
Fish are selfish like that.
Egocentric little fishies.