Photo copyright Tim Nicholson.
Taken on Abu Ramada, Egyptian Red Sea.
Shoal of Blackspotted Sweetlips or Grunts, Plectorhinchus gaterinus

Sweetlips have thick lips, continuous dorsal fins and truncate or emarginate tails. Adults are often inactive during the day and shelter near or under ledges. They feed at night on bottom-dwelling invertebrates. The juveniles of Blackspotted sweetlips have 6 black lines on their heads and bodies, these become spots with age.

Further Reading
Coral Reef Fishes, Indo-Pacific and Caribbean , by Ewald Lieske and Robert Myers, Harper Collins