Blue Moon Angelfish與YELLOWBAR ANGELFISH好像同一隻魚.
學名又同是Pomacanthus maculosus.香港的水族世界(15期)所指的紫月是Pomacanthus maculosus英名是YELLOWBAR ANGELFISH(用Google搜尋找的).台灣的觀賞魚54期半月神仙學名是Pomacanthus maculosus英名是Blue Moon Angelfish.
http://digilander.libero.it/scubabob/Sudan/angelo01.html (YELLOWBAR ANGELFISH)
http://www.wildlifewebsite.com/fish/blue-moon-angelfish-61.html (Blue Moon Angelfish)