Banded sergeant
(Abudefduf septemfasciatus)

Abudefduf septemfasciatus, commonly known as the banded sergeant, is a species of damselfish in the family Pomacentridae.

The species is native to the Indo-Pacific and can reach 23 cm (9.1 in) in total length.

Abudefduf septemfasciatus is a non-migratory marine fish associated with lagoons and coral reefs found at depths of 0 to 3 m (0 to 10 ft). The species is highly territorial and feeds on benthic algae and various invertebrates. It is oviparous, with individuals forming distinct pairs during breeding and males guarding and aerating eggs.

Abudefduf septemfasciatus occurs in the Indo-Pacific, where it ranges from East Africa to the Line and Tuamotu Islands, north to southern Japan, and south to the southern Great Barrier Reef.