A Taiwanese scientist has devised a way to make otherwise colorless fish glow neon green in the dark. Professor H.J. Tsai at National Taiwan University works this biological magic by injecting a protein extracted from jellyfish into the fertilized eggs of rice fish. He also uses a protein from coral to make fish glow a vibrant reddish pink. [Full article with picture]
If they were available in the U.S. I'd unmothball my aquarium.