One of the coolest invention of 2003 according to Time Magazine :"Want to add some pizazz to your aquarium? 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. Opponents of genetic engineering fear that these creatures could crossbreed with wild species, creating glowing schools of Frankenfish. To keep them from spreading their shining DNA, the distributor, Taikong International, sterilizes them all."

website of his invention...