Bluespotted Rabbitfish

The Bluespotted Rabbitfish (Siganus corallinus), also known as the coral rabbitfish, is one of the most colorful members of the rabbitfish family, its yellow-orange body densely covered in small, bright blue spots that continue in radiating lines around the eyes. It is closely tied to coral-rich reef habitat across the Indo-Pacific, where it grazes algae from live coral rock and rubble. Like other rabbitfish, it carries venomous spines in its dorsal, anal, and pelvic fins as a defense mechanism against predators. Its striking coloration makes it a popular aquarium species, though it requires ample swimming space and a steady supply of algae or prepared herbivore diets to thrive.

• Body color: Bright yellow-orange background densely covered in small electric-blue spots.
• Face: Blue spotting extends in radiating lines around the eyes.
• Fins: Tall spiny dorsal fin with venomous spines; fin edges often dusky.
• Habitat cue: Closely associated with live coral cover, more so than many other rabbitfish species.
• Look-alikes: Distinguished from the similarly patterned Siganus punctatissimus (peppered rabbitfish) by its bolder, larger blue spots on a more solidly yellow-orange background.

Bluespotted Rabbitfish are found across the Indo-Pacific, from the eastern Indian Ocean through Indonesia and the Philippines to parts of Micronesia and the western Pacific. They inhabit coral-rich reef flats, lagoons, and outer reef slopes, typically at depths from the shallow subtidal zone down to about 15 to 20 meters. The species shows a stronger preference for live coral cover than many other rabbitfish, often seen weaving among branching and plate corals in search of algae growth. It favors clear, healthy reef water with abundant coral structure for both feeding and shelter.

Bluespotted Rabbitfish graze filamentous algae from coral rock, rubble, and the margins of live coral colonies throughout the day, often foraging alone or in loosely associated pairs. Their close ties to live coral habitat mean they are more frequently encountered on healthy, structurally complex reefs than on degraded or algae-dominated ones. As with other rabbitfish, they rely on venomous spines in the dorsal, anal, and pelvic fins for defense, erecting them when threatened by predators or handled. Reproduction follows the typical rabbitfish pattern of pair spawning in open water, usually timed around dusk, producing pelagic eggs and larvae that eventually settle back onto coral reef habitat as juveniles.