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Humuhumu Triggerfish

Rhinecanthus rectangulus

Marine Marine Indo-Pacific

A striking wedge-tailed triggerfish famous as Hawaii's state fish. Boasting bold geometric black, orange, and blue markings, it possesses immense character alongside powerful jaws. Keep in a robust fish-only setup without invertebrates or passive companions, as it will relentlessly dismantle crustaceans and can harass timid or slow-swimming tank mates.

Also called: Black-banded triggerfish, Black-banded trigger-fish, Humuhumu, Patchy triggerfish.

22 cm adult length, drawn to scale. deep body.

Saltwater species. The planner judges it with a marine rule set. A reef or fish-only tank takes months to mature and costs more to run than freshwater. See the marine page.

Try it in the planner Opens a tank sized to its minimum with 1 fish added.

What it needs

ItemValueBecause
Adult length 22 cm Used for the Space check: the tank must be long enough for the fish to turn round.
Smallest tank 350 L, at least 120 cm long estimated The least water and floor length this species is kept in for good, as a single fish or smallest group.
Extra water per added fish 100 L estimated What each further fish adds once the minimum is met.
Waste load Class 4 of 5 estimated How much waste an adult makes against its size. Feeds the Load check.
Temperature 23 to 27 C Stock sharing a tank need overlapping ranges.
pH 8.1 to 8.4 Compared with tankmates in the Water check.
Hardness GH 8 to 12, KH 8 to 12 Degrees of general and carbonate hardness.
Flow Medium Low-flow fish are stressed in a strong current.
Light Moderate Matched to the lighting class on the needs sheet.
Group size Single fish is fine Not a schooling species.
Temperament Aggressive Territorial: strong.
Swims in All levels Fish that use different levels share a tank more easily.
Lifespan About 15 years A fish is a long commitment.
Experience Suits a first tank A guide to how forgiving the species is of mistakes.
Salinity Marine, about SG 1.023 to 1.025 Needs salt water, a different build and a longer-running tank than a freshwater set-up.

Tags marked estimated are judged from the size and habits of the species rather than measured, so treat them as a sensible default.

Diet and tank layout

Humuhumu Triggerfish is an carnivore that swims in all levels of the tank. It is safe with plants. Give it plenty of cover. It digs, so anchor plants and keep hard rock off loose sand. It will eat fish small enough to swallow. It nips fins.

Tankmates

Works with

No close matches in the data. Check the pair tool.

Depends

Avoid

Compare any two fish on the compatibility page, or print the equipment for a stock on the needs sheet. How this is worked out: the method.