Masked Butterflyfish

Overview

The Masked Butterflyfish (Chaetodon semilarvatus) is a striking marine species native to the northwestern Indian Ocean, specifically the Red Sea and the Gulf of Aden. It is a common inhabitant of coral-rich environments, often recognized by its vibrant appearance and tendency to form long-term pair bonds.

Appearance

This species is unmistakable due to its bright, golden-yellow body, which is patterned with thin, vertical orange-to-red lines. Unlike many of its relatives that feature a distinct eye bar, the Masked Butterflyfish displays a characteristic greyish-blue patch around the eyes and cheeks. It possesses a deep, compressed body and a relatively short snout, typically reaching lengths of 15 to 23 centimeters.

Distribution & habitat

The Masked Butterflyfish is primarily found in the Red Sea, the Gulf of Aden, and along the southern Arabian Peninsula, including the coasts of Yemen and Oman. It favors shallow, reef-associated waters with abundant coral growth, typically residing at depths between 1 and 20 meters.

Biology & behavior

Known for being one of the few butterflyfish species to maintain long-term mates, these fish are frequently observed swimming in pairs or small shoals. They exhibit unique resting behavior, occasionally hovering in a stationary position for extended periods beneath the ledges of plate corals, particularly those of the genus Acropora. As an oviparous species, they form pairs specifically for spawning during the day.

Feeding

In its natural habitat, this species is primarily a corallivore, feeding on coral polyps, though its diet also includes various benthic invertebrates.