Holocentrus adscensionis, commonly known as the squirrelfish, inhabits coral reefs in the Atlantic Ocean. Recognizable by its vivid red body and large eyes, it's nocturnal and uses its keen night vision to hunt crustaceans. Known for its distinctive grunting sounds, it plays a crucial role in reef ecosystems.

Holocentrus adscensionis, commonly known as the squirrelfish, is native to the Western Atlantic Ocean. Its geographical distribution includes the coastal regions of the United States, Bermuda, the Bahamas, and throughout the Caribbean Sea. It is also found along the coasts of Central and South America, extending as far south as Brazil.

Holocentrus adscensionis typically inhabits coral reefs and rocky areas in tropical and subtropical marine environments. It is most commonly found at depths ranging from 2 to 50 meters. The species prefers clear, warm waters with temperatures between 22°C and 28°C.

This species occupies an ecological niche as a nocturnal predator. It feeds primarily on small fish and invertebrates, such as crustaceans. During the day, it seeks shelter within the reef structure or in crevices, emerging at night to hunt. Its bright coloration and large eyes are adaptations for its nocturnal lifestyle, aiding in both camouflage and enhanced vision in low-light conditions.