Blue-Axil Chromis

Pycnochromis caudalis

The Blue-axil Chromis is a small damselfish species reaching up to 7.5 cm in length. It features a compressed body with a short and deep shape, making it easily recognizable among other reef fish. Divers can spot this fish in the Western Pacific and Eastern Indian Oceans, from Christmas Island to the Solomon Islands, and north to the Philippines. It is also present in regions like Palau, Pohnpei, and New Caledonia. This species prefers the ledges and bases of small caves along steep outer reef slopes, typically found at depths ranging from 15 to 55 meters. The Blue-axil Chromis is a diurnal fish that forms small groups, staying close to shelter. It is oviparous, with distinct pairing during breeding. The eggs are demersal, adhering to the substrate, and males take on the role of guarding and aerating them. Divers encountering the Blue-axil Chromis can expect to see them in small groups, often hovering near their preferred habitats. The species is currently listed as Least Concern by the IUCN.