Not furry, but we like them anyway.
Picasso Triggerfish
Rhinecanthus aculeatus
Also called Lagoon triggerfish, White-banded triggerfish, Blackbar triggerfish, Picassofish, Humu Picasso triggerfish
From Indo-Pacific: East Africa east through northern Australia to the Hawaiian, Marquesas and Tuamotu islands, north to southern Japan1
At a glance the quick version
Looks how to spot one
Oval, compressed reef triggerfish
A tan to pale body painted with bold patches and lines of black, blue, orange and yellow, giving it the abstract-art look behind its Picasso name.31
Personality what they are like
Feisty and territorial, especially when guarding eggs. Best kept with other robust fish.32
Daily activity how busy a day looks
A restless swimmer that explores constantly and can move forwards, backwards and hover using its dorsal and anal fins. It often rearranges rocks and sand in its tank.23
Grooming and care the hands-on bits
Rated easy care. Not reef-safe. Expect it to rearrange rockwork and sand as it explores caves and crevices.3
Home where they are happiest
A tank of at least 180 US gallons (about 680 L) with caves and crevices. Saltwater at 22 to 26 °C (72 to 78 °F), pH 8.1 to 8.4, specific gravity 1.020 to 1.025. Wild fish live on shallow reef flats and sheltered lagoons down to about 50 m.31
Food basics what goes in the bowl
Feed meaty marine foods such as squid, krill, clams and shell-on shrimp. In the wild it eats almost anything it finds, mostly invertebrates and algae.321
Company who they like around
The story where it all began
Carl Linnaeus described the species in 1758. Its colourful pattern earned it the nickname Picassofish, after the painter Pablo Picasso.12
Fun facts for the dinner table
Recognised by the official bits
- IUCN Red List
- Least Concern (assessed 2022)1
The care rhythm a typical week and year
A typical home-care rhythm for a Picasso Triggerfish. A starting point, not a vet's advice.
- FeedingSmall amounts once or twice a dayevery day
- Temperature checkevery day
- Salinity checkevery week
- Top-upTop up evaporation with fresh RO water, not salt waterevery day
- Water testevery week
- Water changeAbout 10 to 20% of the waterevery 2 weeks
- Glass cleanevery week
Owner questions the things everyone asks
How often should I feed my Picasso Triggerfish?
Feed small amounts once or twice a day, every day. Furry Diary's starting plan suggests this routine. Adjust portions based on your fish's appetite and the food label, and check with your vet if unsure.321 Pet Wiki plan
What does a Picasso Triggerfish eat, and what should it never eat?
It eats meaty marine foods like squid, krill, clams, and shell-on shrimp. In the wild it also eats invertebrates and algae. Never feed it anything that isn't a marine food, and avoid freshwater foods or items not meant for saltwater fish.321
How much space does a Picasso Triggerfish need?
It needs a tank of at least 180 US gallons (about 680 liters) with plenty of caves and crevices. This active swimmer rearranges rocks and sand, so give it room to explore.31
What temperature, light or water does a Picasso Triggerfish need?
Keep saltwater at 22 to 26 °C (72 to 78 °F), pH 8.1 to 8.4, and specific gravity 1.020 to 1.025. Furry Diary's plan includes daily temperature checks and weekly salinity tests. Use a marine aquarium setup with standard lighting.31 Pet Wiki plan
How often should I clean a Picasso Triggerfish's home?
Furry Diary's plan suggests a weekly glass clean and a 10 to 20% water change every two weeks. Also test the water weekly and top up evaporation daily with fresh RO water. Adjust based on your tank's needs and ask your vet for guidance. Pet Wiki plan
Can a Picasso Triggerfish live with others?
It is solitary and territorial, so keep only one per tank. It can live with other robust fish, but is not reef-safe and may rearrange rocks. Avoid small or timid tank mates.321
How long does a Picasso Triggerfish live?
Lifespan varies widely depending on care and environment. For specific information, ask your vet or a good breeder, as it depends on tank conditions and diet.
Can I handle a Picasso Triggerfish?
No, it is not a fish to handle. It has a feisty temperament and can be territorial. Enjoy watching it swim and explore, but never touch it to avoid stress or injury.32
Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Pet Wiki's own starting care plan. A friendly guide, not a vet's advice.
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Every fact on this page has a numbered source. Spotted an error? [email protected].
- FishBase: Rhinecanthus aculeatus, White-banded triggerfish fishbase.seused for distribution, length, depth, habitat, diet, behaviour, IUCN status, describer, name origin
- Wikipedia: Lagoon triggerfish en.wikipedia.orgused for other names, behaviour, swimming, vision, egg care
- LiveAquaria: Humu Picasso Triggerfish liveaquaria.comused for aquarium care, tank size, water parameters, temperament, diet, colours
Checked 2026-09-30. Text is written in our own words from these sources.