Toothy Cardinalfish

Cheilodipterus isostigma

The Toothy Cardinalfish is a reef-associated species found in the Indo-Pacific region, including the Maldives, Philippines, Palau, Indonesia, Tonga, Moluccas, Belau, and Caroline Islands. It inhabits tropical waters, typically residing in lagoon reefs at depths ranging from 4 to 50 meters, although most are found shallower than 40 meters. This species is often seen in small groups among staghorn corals, preferring deeper areas compared to its relative, C. quinquelineatus. This cardinalfish reaches a maximum length of 11 cm and can be identified by its elongated, oval body shape. It is distinguished from similar species by the position of its basicaudal spot, which aligns with the mid-lateral stripe, and the presence of canine teeth at the end of its lower jaw. The Toothy Cardinalfish primarily feeds on small fish, making it a predatory species within its coral reef habitat. Reproduction involves distinct pairing during courtship and spawning, with the species exhibiting mouthbrooding behavior. Despite its presence across various dive sites, the Toothy Cardinalfish has not been evaluated for conservation status by the IUCN.