Flagfin Angelfish

The Flagfin Angelfish is a handsome and widely distributed member of the Apolemichthys genus, admired for its vibrant yellow body adorned with distinctive dark markings. The body is a rich bright yellow with a prominent black spot on the forehead just above the mouth, a dark patch at the base of the dorsal fin, and another at the operculum, giving rise to its alternate name, the Three-spot Angelfish. The dorsal fin features a dramatic elongated filament or flag-like extension in mature specimens, which is the hallmark feature behind the Flagfin common name.

This species ranges across a broad Indo-Pacific distribution, from the coast of East Africa through Indonesia and out to the western Pacific including the Great Barrier Reef. It inhabits coral-rich reef slopes and lagoons, typically at depths of 5 to 40 meters, where it feeds on sponges, tunicates, and algae growing on reef surfaces. Its relatively wide distribution makes it more commonly available than many other Apolemichthys species, and captive-bred specimens have further improved accessibility.

The Flagfin Angelfish adapts well to aquarium life with moderate care requirements. At a maximum size of 10 inches, it needs a spacious tank of at least 180 gallons with ample live rock for grazing and hiding. While not considered reef safe due to its sponge-eating habits and tendency to pick at corals and clam mantles, it is an excellent choice for large fish-only systems. Its bold yellow coloration and active swimming behavior make it a visually commanding presence in any appropriately sized aquarium.