Acanthochromis
Acanthochromis is a genus of fish in the family Pomacentridae. These fish are commonly called damselfishes, and are endemic to the Indo-Pacific region. There are three recognized species within this genus: Acanthochromis polyacanthus, Acanthochromis spilurus, and Acanthochromis humeralis.
Common Names
Members of the genus Acanthochromis are known by a variety of common names, including:
- Acanthochromis damselfish
- Dusky damselfish
- Yellowtail damselfish
Characteristics
Acanthochromis species are characterized by their elongated bodies, with a depth that is less than half of their standard length. They typically have a robust build and a pointed snout. They are known for their colorful coloration, which can vary depending on the species and individual. For example, Acanthochromis polyacanthus exhibits a deep blue body, while Acanthochromis spilurus has a black body with yellow fins. Acanthochromis humeralis, however, displays a distinctive orange-red body and yellow tail.
Like other damselfishes, Acanthochromis species are territorial and may defend their territories aggressively, especially during breeding season. They have a single dorsal fin, which is continuous and composed of both spines and soft rays. The anal fin is similarly structured and is located on the ventral side of the body.
Environments
Acanthochromis species inhabit coral reefs and rocky shores in the Indo-Pacific region. They typically prefer shallow waters, often ranging from the intertidal zone to depths of around 50 meters. They are found in a variety of habitats, including seaward reefs, sheltered lagoons, and estuaries. Acanthochromis species feed primarily on algae and zooplankton, which they glean from the reef surfaces.