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Naso brevirostris (Cuvier, 1829)

Spotted unicornfish
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Native range | All suitable habitat | Point map | Year 2050
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Naso brevirostris   AquaMaps   Data sources: GBIF OBIS
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Australia country information

Common names: Longnose surgeonfish, Longnosed unicornfish, Palefin unicornfish
Occurrence: native
Salinity: marine
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Known from the Great Barrier Reef and the Coral Sea, including Lord Howe Island. Recorded from Shark Bay (Ref. 115274). Also Ref. 1602, 37792.
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/as.html
National Fisheries Authority: http://www.csiro.au/
Occurrences: Occurrences Point map
Main Ref: Randall, J.E., G.R. Allen and R.C. Steene, 1990
National Database:

Common names from other countries

Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Teleostei (teleosts) > Acanthuriformes (Surgeonfishes) > Acanthuridae (Surgeonfishes, tangs, unicornfishes) > Nasinae
Etymology: Naso: Latin, nasus = nose (Ref. 45335).
  More on author: Cuvier.

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; reef-associated; depth range 0 - 122 m (Ref. 58302), usually 4 - 46 m (Ref. 27115).   Tropical; 24°C - 28°C (Ref. 27115); 29°N - 36°S, 26°E - 137°W (Ref. 57250)

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Indo-Pacific: Red Sea and East Africa to the Hawaiian, Marquesas and Ducie islands, north to southern Japan, south to Lord Howe Island (Ref. 1602); exxcluding Oman and Persian Gulf (Ref. 86689). Eastern Central Pacific: Galápagos Islands.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 60.0 cm TL male/unsexed; (Ref. 9808)

Short description Identification keys | Morphology | Morphometrics

Dorsal spines (total): 6; Dorsal soft rays (total): 27 - 29; Anal spines: 2; Anal soft rays: 27 - 30. This species is distinguished by the following characters: body moderately deep and compressed, its depth 2.6 to 3 times in standard length (SL) (reported greatest depth of body in subadults at 2.3 in SL, Ref. 90102); dorsal profile of body uniformly convex; adults with a median, broad-based, tapering, horn-like projection extending directly anteriorly from snout at level of lower part of eye to more than 1/2 head length in front of mouth (first developing as a bump on forehead of young of about 10 cm SL; dorsal profile of snout from upper lip to base of horn very short, curved, and nearly vertical; mouth small; teeth small, spatulate, with denticulate edges, about 50 in each jaw; a continuous unnotched D VI,27-29; A II,27-30; pectoral-fin rays 15-17; pelvic fins I,3; caudal fin slightly rounded, without a filament from each corner; 2 bony plates on each side of caudal peduncle, developing moderate keels with age; colour of body olivaceous grey-brown to light grey, usually with vertical dark brown lines on body which break into small spots dorsally and ventrally; some individuals only with small dark spots; head with small dark brown spots or short irregular lines which become long and oblique on horn (dark markings on one pale phase may be faint or absent; in another phase the anterior third of the body may be distinctly paler than the rest); caudal fin whitish with a large diffuse dark blotch centrobasally in fin (Ref. 9808).

Biology     Glossary (e.g. epibenthic)

Inhabit mid-waters along steep outer lagoon and seaward reef drop-offs. Also found along rocky shores (Ref. 30573, 48637). Benthopelagic (Ref. 58302). Usually in small groups but form large schools in oceanic locations or on reefs subject to strong currents (Ref. 48637). Juveniles and subadults feed on benthic algae; adults feed on zooplankton. Pair spawning has been observed. Caught with nets (Ref. 30573). Minimum depth reported taken from Ref. 128797.

Life cycle and mating behavior Maturities | Reproduction | Spawnings | Egg(s) | Fecundities | Larvae

Probably spawn in pairs (Ref. 240).

Main reference Upload your references | References | Coordinator : Randall, John E. | Collaborators

Myers, R.F., 1991. Micronesian reef fishes. Second Ed. Coral Graphics, Barrigada, Guam. 298 p. (Ref. 1602)

IUCN Red List Status (Ref. 130435)

  Least Concern (LC) ; Date assessed: 04 May 2010

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Reports of ciguatera poisoning (Ref. 30298)




Human uses

Fisheries: commercial; aquarium: commercial
FAO(Publication : search) | FishSource | Sea Around Us

More information

Trophic ecology
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Food consumptions
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Estimates based on models

Preferred temperature (Ref. 115969): 24.3 - 29, mean 27.8 (based on 1558 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01950 (0.01248 - 0.03047), b=3.02 (2.89 - 3.15), in cm Total Length, based on LWR estimates for this species & Genus-body shape (Ref. 93245).
Trophic level (Ref. 69278):  2.2   ±0.15 se; based on food items.
Resilience (Ref. 120179):  Medium, minimum population doubling time 1.4 - 4.4 years (K=0.402; Tmax=25).
Fishing Vulnerability (Ref. 59153):  Low to moderate vulnerability (33 of 100).
Price category (Ref. 80766):   Medium.