Genetically engineered Pterophyllum Scalara fish glow in a tank under a blacklight while being displayed at the 2013 Bio Expo in Taipei July 18, 2013. The show will be held at Taipei World Trade Center Nangang Exhibition Hall from July 18 to 21. REUTERS/Pichi Chuang (TAIWAN - Tags: SOCIETY ANIMALS TPX IMAGES OF THE DAY)