The Sergeant Major, Abudefduf saxatilis, is a unique damselfish species with an oval body that is yellow near its dorsal region and blueish/silver near its underbelly. Its name comes from the striping across its back that resembles the black bars of a Sergeant Major's military insignia.
Males and females are nearly identical making breeding in captivity difficult. It will eat an omnivorous diet consisting of small inverts, quality flake foods, and frozen meaty foods. They can be a bully in a community reef tank so be sure not to pair with fish that can be bullied. It is generally reef safe if kept with the right tank mates.