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Yellowtail Fusilier (Caesio cuning) being cleaned by Bluestreak Cleaner Wrasse (Labroides dimidiatus)

Dr. Gerald (Gerry) R. Allen is the world’s leading tropical marine ichthyologist, and a frequent contributor to this site.  He is the author of over 400 scientific articles and 35 books.  Along with co-author Dr. Mark Erdmann, he recently released his Magnum Opus, the 3-volume Reef Fishes of the East Indies.