The stoplight parrotfish (Sparisoma viride) is a sex-changing fish inhabiting coral reefs in Florida, Caribbean Sea, Gulf of Mexico, Bermuda and as far south as Brazil.[1] Its typical length is between 1–1.5 ft (30–46 cm), but it can reach 2 ft (61 cm) at times. It is normally found during the day between 15–80 ft (4.6–24 m).[1]
The colors of the stoplight parrotfish in the initial phase, when it could be either a male or a female, are dramatically different from those in the terminal phase, when it is definitely a male.
The common name, stoplight, comes from the marked yellow spot near the pectoral fin, which is clearly visible only in specimens in the terminal phase.
(From Wikipedia, May 31st, 2012)