Blue-ribbon Wrasse

Stethojulis trilineata, also known as the blue-ribbon wrasse, red shouldered rainbow-fish, scarlet-banded rainbowfish, three-blueline wrasse, three-lined rainbowfish or three-lined wrasse, is a species of marine ray-finned fish, a wrasse from the family Labridae. It is found in the Indo-Pacific region where it is associated with reefs.

Adapted from Wikipedia, licensed under CC BY-SA 4.0.