Hawaiian sergeant major
Adults of the species are typically found in quiet waters with rocky bottoms in inshore and offshore reefs at a depth of 1 to 50 m (3 to 164 ft), although juveniles (young fish) may sometimes be found in surge pools. It is a benthopelagic species, with adults being known to form schools (large groups). The species feeds on a variety of algae and zooplankton and is oviparous, with distinct pairing occurring during breeding. Eggs of Abudefduf abdominalis are demersal (bottom feeders) and adhere to the ground ?(substrate), with males guarding and aerating (giving air) the eggs. The species is known to be used as a food source for humans in Hawaii. It occasionally appears in the aquarium trade.