Bluntheaded Wrasse

Thalassoma amblycephalum, the blunt-headed wrasse, blue-headed wrasse, blue-headed zoe, moon wrasse, paddle-fin wrasse or two-tone wrasse, is a species of wrasse native to the Indian Ocean and the western Pacific Ocean. It is a reef inhabitant, being found in schools at depths from 1 to 15 m. This species can reach 16 cm (6.3 in) in standard length. It can also be found in the aquarium trade.

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