Abudefduf sordidus (Forsskål, 1775)

Common and Scientific Name

Blackspot sergeant, also known by the scientific name Abudefduf sordidus (Forsskål, 1775), are typically yellowish-grey.

Body Markings

They have six broad brown bars, six to seven narrow light-colored bars, and a distinct black spot at the upper base of the tail.

Size and Lifespan

Fully grown individuals can reach a maximum total length of 24 centimeters (9.4 inches), and wild individuals are known to live up to nine years.

Adult Habitat and Depth Range

This species is commonly found in tidepools and shallow rocky areas that experience moderate surge, at depths ranging from 0 to 3 meters (0 to 10 feet).

Juvenile Habitat and Diet

Juvenile blackspot sergeants are most often found in tidepools, where they feed on algae, small animals, and plankton.

Mature Habitat Shift

As they mature and grow larger, they move to deeper areas with greater surge.

Territorial Behavior

Blackspot sergeants are highly territorially aggressive, particularly toward other fish that share their tidepool habitat.

Diel Activity Pattern

During the daytime, they are commonly found close to rocky areas, while at night they take shelter under various objects.

Reproductive Mode

This species is oviparous.

Mating Behavior

Males construct nest sites in rocky areas to attract females, and they are thought to become especially aggressive during this mating period.