Those are beautiful fish.
They are a rare mutation of the normal JD. From what I've read, you have to do breed a blue male to a regular female, then raise the young & breed the blue father to his daughter fish to get some electric blue mutants. They are also supposed to be smaller & less aggressive than regular JDs.
As for adult colouration, I think they remain blue but not as electric as the juv.
HTH,
Anthony
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