My wife and I looked through "Reef Fish Identification's" parrotfishes several times. We are guessing this is a yellowtail parrotfish. If it is, it is probably the first time I have seen one. "My" fish's tail is less lunate than the one in the book, and the coloring seems different. Is it, indeed, a yellowtail parrotfish?
Molasses Reef, Key Largo, Florida, August 2, 2010, 27 feet of water, 88 degrees Fahrenheit, 48 feet lateral visibility.