Stegastes fuscus
Source: http://www.photolib.noaa.gov/fish/fish3144.htm
Source: https://commons.wikimedia.org/wiki/File:Stegastes_fuscus.jpg

Brazilian damsel (Stegastes fuscus), also known as the dusky damselfish, is a species of bony fish in the family Pomacentridae found near the seabed in shallow waters on the western fringes of the Atlantic Ocean. Order: Perciformes, Family: Pomacentridae.