Blacktail Chromis

Pycnochromis nigrurus

The Blacktail Chromis is a small, reef-associated fish belonging to the family Pomacentridae. It is characterized by its fusiform body shape and compressed cross-section. Divers can identify this species by its distinctive dorsal fin structure, which includes 12 dorsal spines and 10 to 11 dorsal soft rays, along with 2 anal spines and 11 anal soft rays. These fish reach a maximum length of 6.0 cm and are typically found in the Indian Ocean, from eastern Africa to Sri Lanka and the Maldives, with additional sightings at Cocos-Keeling and Christmas Island. Blacktail Chromis inhabit tropical seaward reefs, particularly favoring coral-rich outer reef crests. They are non-migratory and can be found at depths ranging from 1 to 30 meters. As oviparous fish, they exhibit distinct pairing during breeding, with males taking on the role of guarding and aerating the demersal eggs that adhere to the substrate. While no specific dietary information is available, divers encountering Blacktail Chromis can expect to find them in coral reef environments. They are harmless to humans and hold a conservation status of Least Concern, as assessed by the IUCN.