Longnose Tang
Zebrasoma rostratum
Also known as: Longnose Surgeonfish
A sleek, all-black Pacific tang with a distinctively elongated snout.

About
The longnose tang (Zebrasoma rostratum) is one of the more unusual members of its genus, immediately recognizable by its uniform jet-black coloration and the noticeably extended snout that gives the fish its common name. It hails from a scattered chain of remote Eastern Central Pacific island groups, from the Line and Marquesas Islands down through the Society and Tuamotu archipelagos to the Pitcairn group. In the wild it occupies both lagoon environments and the more exposed seaward faces of reefs, living a benthopelagic lifestyle that keeps it cruising close to the substrate in search of food. That elongated snout is more than a curiosity. It pairs with fine, numerous pharyngeal teeth that are well suited to grazing filamentous algae from rocky surfaces. In the aquarium this fish needs the same thing: consistent access to algae-based foods, supplemented with dried seaweed and quality prepared foods. Because it comes from some of the most isolated reef systems on the planet, it is not a species you encounter often in the trade, and specimens tend to command a premium. Its size and need for genuine swimming room make it a fish for spacious, well-established reef or FOWLR systems, best suited to keepers with some tang experience already under their belt.
Similar species
Other fish you might consider
From the same region
Share the same natural habitat. Great for a biotope-themed tank
Frequently asked questions
- How big does the Longnose Tang get?
- The Longnose Tang reaches about 5–9" as an adult.
- What size tank does the Longnose Tang need?
- A minimum of 180 gallons is recommended for the Longnose Tang.
- What water parameters does the Longnose Tang need?
- The Longnose Tang does best with a temperature of 72–82°F, a pH of 8–8.4.
- Is the Longnose Tang aggressive?
- The Longnose Tang is aggressive and is best kept alone or with robust tankmates that can hold their own.
- What does the Longnose Tang eat?
- The Longnose Tang is a herbivore. It needs a plant-based diet such as algae, blanched vegetables, or spirulina-based foods.
- How long does the Longnose Tang live?
- With good care, the Longnose Tang typically lives 5-8 years.
- Is the Longnose Tang reef safe?
- The Longnose Tang is generally considered reef safe.