Why are jellyfish different colours? I'm assuming that it's not some sort of display put on for the benefit of other jellyfish. Jellyfish don't have eyes, although some have a few light-sensitive cells that can distinguish light from dark. Come to think of it, they haven't got anything you could call a brain.
I don't think the different colours are camouflage, either. Jellyfish can be transparent, which is about as good a disguise as you can get, so I can't imagine that any additional colouration helps in this respect.
Maybe the colours are signals to warn off predators, like the yellow and black stripes of a wasp, but I really don't have a clue.
Answer to follow when I find it...
Picture courtesy of Malene Thyssen.
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