Saddle Wrasse

"Perhaps the most common fish on shallow Hawaiian reefs. Juveniles are striped brown, black and white, gradually assuming the tri-colored adult pattern. Supermales have a diffuse white streak behind the orange saddle. Feeds opportunistically on invertebrates, fish eggs, and algae. Spawning aggregations may be observed on spring and summer afternoons as the tide falls during a new moon, with males herding a group of females until they all dart rapidly upward, releasing eggs and sperm at the peak before descending. Attains 10 inches. Closely related to the extremely rare Sunset wrasse with which it may interbreed to produce hybrid offspring. Endemic to Hawai‘i."

http://www.marinelifephotography.com/fishes/wrasses/thalassoma-duperrey…