Ornate wrasse male with females
The Ornate wrasse, Thalassoma pavo, is a species of wrasse native to the rocky coasts of the eastern Atlantic Ocean and the Mediterranean Sea. This species is of minor importance to local commercial fisheries, is also popular as a game fish, and can be found in the aquarium trade. The ornate wrasse shows sexual dichromatism. The females are greenish-brown with a dark bar on each scale and five bluish vertical stripes. Males have red heads with blue markings, situated immediately to the rear of the pectoral fin they have a vertical blue stripe with red margins. The caudal fin in both sexes is turquoise. donzella pavonina
The juveniles are green overall and have a black spot halfway along the back, positioned immediately below the dorsal fin. The body is elongated and laterally compressed with a sharp, oval head. The snout is short with a small, terminal mouth and thick lips. In younger fish the caudal fin and as the fish matures it becomes concave with elongated outer rays forming filaments. It can reach 25 cm in length, though most do not exceed 20 cm. The ornate wrasse is a species of the eastern Atlantic Ocean and the Mediterranean Sea. In the eastern Atlantic it occurs from Portugal southwards along the coast of West Africa as far as Senegal.
The ornate wrasse occurs in on rocky areas where there are growths of algae and Posidonia sea grass beds, it is found from 0 to 50 metres. It can also be found living in anthropogenic structures including shipwrecks, piers and jetties. The females and the juvenile normally live in small groups while the adult males are solitary. In the breeding season the males become territorial and guard a harem. Its diet consists of small molluscs and crustaceans and the juveniles will act as cleaner fish, feeding on the ectoparassites taken off the skin of other fishes. As it hunts for this prey it swims with quick jerky movements. They bury into sandy areas at night by vigorously shaking their tail, spending the night on their sides in the sand.
The ornate wrasse is a protogynous hermaphrodite and females may transform into males which is signified by a change of colour. This means that the population is dominated by a large number of young, fertile females which can produce a large number of eggs. The older and larger solitary males are fewer in numbers as they suffer from a greater predation pressure. Spawing occurs in the spring and the eggs are pelagic.
(extract from wikipedia)