Picasso Triggerfish

The Picasso Triggerfish is a boldly patterned reef fish (family Balistidae) in the genus Rhinecanthus, native to the Indo-Pacific. Its striking geometric pattern of contrasting stripes and bands, reminiscent of abstract art, gives the species its common name and makes it one of the most visually distinctive triggerfish. It is also known in Hawaii as the humuhumunukunukuapuaa. Common on shallow reef flats and lagoons, it is a popular aquarium species and remains widespread and abundant throughout its native range.

• Oval, laterally compressed, deep body typical of triggerfish
• Pale cream to white base with a bold black eye-stripe and mouth markings
• Diagonal blue and yellow bands across the cheek and snout
• Black triangular saddle patch near the base of the tail
• Small mouth with strong, chisel-like teeth
• Erectile first dorsal spine that locks upright; reaches 20-25 cm

Distinguished from other Rhinecanthus triggerfish by its specific combination of blue-yellow cheek bands and the black tail-base saddle.

Picasso Triggerfish inhabit shallow lagoons, reef flats, and seagrass-adjacent sandy areas throughout the Indo-Pacific, from the Red Sea and East Africa to Hawaii and the central Pacific. They are typically found at depths of 1-20 m in warm, clear tropical water, favoring mixed sand and rubble habitats near reef structure where they can forage and retreat. They are frequently seen in very shallow water, including tide pools and reef flats exposed at low tide.

This triggerfish feeds on a variety of benthic invertebrates, including worms, crustaceans, and mollusks, which it excavates from sand by blowing jets of water, along with some algae. It is generally solitary and can be territorial, particularly females guarding a nest site, using its locking dorsal spine to wedge into reef crevices for protection when threatened. Picasso Triggerfish dig shallow pits in sand to deposit and guard demersal eggs, with the guarding parent actively driving off intruders that approach the nest during the brooding period.