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Picasso Triggerfish
Rhinecanthus aculeatus
Animalia›Chordata›Actinopterygii›Tetraodontiformes›Balistidae
📍 Indo-Pacific, Red Sea to Hawaii
Named for its abstract Picasso-esque colour pattern — white body with blue, yellow, and black geometric markings. Hardy, intelligent, and full of personality. Not reef-safe; aggressive toward other fish. Often the star of a FOWLR tank.
Care Guide
Diet
Picasso Triggerfish are carnivorous and require a diet of hard-shelled prey to maintain their powerful jaws and teeth. Feed a variety of frozen or live foods including shrimp, squid, clams, mussels, and snails once daily. Supplement with quality carnivore pellets formulated for triggerfish to ensure balanced nutrition.
Behavior
Highly intelligent and curious, Picasso Triggerfish are bold explorers that constantly investigate their environment and interact with tank décor. They are aggressive toward other fish and will harass, bite, or consume smaller tankmates; they should be housed singly or with very large, aggressive species only. They exhibit distinct personalities and can recognize their owners, often begging for food at feeding time.
Breeding
Breeding Picasso Triggerfish in captivity is extremely rare and difficult, requiring very large tanks (200+ gallons) and specific environmental triggers. Pairs are highly aggressive toward each other outside of spawning season and will fight viciously. Successful captive breeding is virtually undocumented in the hobby.
Tank Mates
Similar size and aggression level; may coexist but requires careful monitoring and ample space
Large, aggressive wrasse that can hold its own; still risk of conflict in smaller tanks
Another aggressive triggerfish; only in very large tanks (150+ gallons) with multiple hiding spots
Common Diseases
Ich (Marine Ich)
White spots on body and fins, rapid breathing, flashing against rocks, lethargy
Raise temperature gradually to 28-29°C, maintain excellent water quality, use copper-based medications or hyposalinity therapy; quarantine infected fish
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges, progressive fin loss
Improve water quality and reduce stress; perform frequent water changes; use antibiotic medications if bacterial infection is confirmed
Mouth Rot (Trench Mouth)
Erosion around mouth and jaw, difficulty eating, visible lesions or pus
Improve water quality immediately; provide soft foods; use antibiotic treatments; ensure adequate nutrition with quality foods
Parasitic Infections
Excessive scratching, visible parasites, weight loss, clamped fins, behavioral changes
Quarantine affected fish; treat with appropriate antiparasitic medications; maintain pristine water conditions; may require copper treatment or freshwater dips
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Quick Facts
- pH
- 8.1–8.4
- diet
- carnivore/hard-shelled prey
- maxSize
- 12 inches
- salinity
- SG 1.020–1.025
- minTankSize
- 100 gallons
- temperature
- 75–82°F (24–28°C)
Temperature
75–82°F
24–28°C