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Naso vlamingii (Valenciennes, 1835)
Big-nose Unicorn; Big-nose Unicornfish; Scribbled Unicornfish; Vlaming's Unicornfish; Naseus vlamingii Valenciennes, 1835; Vlamings bignose unicornfish

Life   Vertebrata   Fish   Acanthuridae   Naso

Naso vlamingii
© Copyright Gerald Allen, 2006 · 0
Naso vlamingii

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Naso vlamingii
© Copyright Roger Steene, 2006 · 0
Naso vlamingii

Main identification features
  • head: no horn, blue stripe and spots
  • body - grey + blue spots and bars
  • c: long filaments
  • tail base: 2 keels
Vlaming's unicornfish Vlaming's bignose unicornfish

Body elongate, oval; snout short, with prominent hump just below eye; teeth small, conical, with tips slightly depressed, smooth or with slight denticulations; tail straight to slightly rounded, with long filament from each corner; dorsal VI, 26-27, fin elevated; anal II, 27-29; pectoral 17-19 rays; 2 plates on each side of narrow tail base, each with knife-like, forward pointed keel.

Yellow-brown, with irregular thin blue bars along flank, and small blue spots above and below bars and on head; broad blue band before eye; lips blue; dorsal and anal yellow-brown with thin blue margins; tail dark, yellow rear border, filaments blue; can change color to overall brilliant blue; juveniles brown with scattered small dark spots.

Size: 60 cm.

Habitat: rocky and coral reefs; juveniles benthic on sheltered habitats and rubble slopes; adults in midwater near exposed reef fronts.

Depth: 1-50 m; juveniles usually 5-15 m; adults usually 10-25 m.

An Indo-Pacific species; recorded as a vagrant from the Galapagos Islands.

Abundance: Common.
Cites: Not listed.
Climate Zone: Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo).
Depth Range Max: 50 m.
Depth Range Min: 1 m.
Diet: pelagic fish larvae; benthic microalgae; zooplankton; benthic macroalgae.
Eastern Pacific Range: Northern limit=2; Southern limit=-2; Western limit=-93; Eastern limit=-90; Latitudinal range=4; Longitudinal range=3.
Egg Type: Pelagic; Pelagic larva.
Feeding Group: Herbivore; Planktivore.
FishBase Habitat: Reef Associated.
Global Endemism: All Pacific (West + Central + East); Indo-Pacific only (Indian + Pacific Oceans); TEP non-endemic; "Transpacific" (East + Central &/or West Pacific); All species.
Habitat: Corals; Reef associated (reef + edges-water column & soft bottom); Rocks; Reef (rock &/or coral); Reef only.
Inshore Offshore: Inshore; Inshore Only.
IUCN Red List: Not evaluated / Listed.
Length Max: 60 cm.
Regional Endemism: Island (s) only; Island (s); Tropical Eastern Pacific (TEP) non-endemic; Eastern Pacific non-endemic; All species.
Residency: Vagrant.
Salinity: Marine; Marine Only.
Water Column Position: Bottom; Mid Water; Near Bottom; Near Surface; Bottom + water column;

Scientific source:

Links to other sites

  • Cuvier , G. and Valenciennes, A., 1835., Histoire naturelle des poissons. Tome dixième. Suite du livre neuvième. Scombéroïdes. Livre dixième. De la famille des Teuthyes. Livre onzième. De la famille des Taenioïdes. Livre douzième. Des Athérines., Histoire Naturelle Des Poissons, 10:1-482.
  • McCosker , J.E. and Humann, P.H., 1996., New records of Galápagos fishes., Charles Darwin Foundation, Noticias de Galápagos., 56:18-26.


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Kingdom Animalia  
 Phylum Chordata  
 Class Actinopterygii  
 Order Perciformes  
 Family Acanthuridae  
 Genus Naso  
  Naso vlamingii    (Valenciennes, 1835) 
Provider: Chen, Jeng-Ping 
hierarchy tree    download xml    download txt    Chinese Page    
Synonyms: Naseus vlamingii Naso valmingi Naso vlamigii Naso vlamingi   details
Citation: 臺灣魚類誌(沈等, 1993); Fishes of the Great Barrier Reef and Coral Sea(Randall et al.,1990)
Character: Dorsal-fin rays VI, 26-27 ; anal-fin rays II, 27-29 ; pectoral-fin rays 17-19 ; pelvic-fin rays I,3. Adults develop a convexly rounded prominent snout and unusually tall dorsal and anal fins; Body dark gray-brown to pale bluish gray; ventrical dark bluish lines on side of body with small dark bluish spots above and below; head with small dark bluish spots and a broad blue band extending anteriorly from eye; lips blue; caudal fin bluish basally, gray in broad middle zone, with a broad yellowish border; caudal filaments and upper and lower edges of fin blue. 
Habitat: Usually seen in open water in outer reef aeras, especially near drop-offs, but may also occur in lagoons. Forms mid-water aggregations off steep slopes during the day to feed on zooplankton. Usually found alone or in pairs. Omnivorous. Has the ability to  
Distribution: Indo-Pacific: East Africa to the Line, Marquesan and Tuamotus islands; north to southern Japan, south to the southern Great Barrier Reef and New Caledonia. Throughout Micronesia. Taiwan: South, Hsiaoliuchiu, Lyudao, East.  
Utility: Commercial aquarium species. 
Name Code: 381291
Suggested Link    The Fish Database of Taiwan    FishBase    Discover Life    World Register of Marine Species (WoRMS)  
User Response:   upload Comments    upload Photo
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Number of matches : 4
Query: SELECT * FROM img WHERE ready=1 and taxon like "Naso vlamingii%" and (lifeform != "specimen_tag" OR lifeform != "Animal") ORDER BY taxon

Click on the thumbnail to see an enlargement

Naso vlamingii
Naso vlamingii
ID: 4444 4444 1106 0100 [detail]
© 2006 Moorea Biocode

Naso vlamingii
Naso vlamingii
ID: 4444 4444 1106 0101 [detail]
© 2006 Moorea Biocode

Naso vlamingii
Naso vlamingii
ID: 0000 0000 0313 0380 [detail]
© 2013 John White

Naso vlamingii
Naso vlamingii
ID: 0000 0000 0313 0383 [detail]
© 2013 John White

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Naso vlamingii (Valenciennes , 1835)

Bignose unicornfish Add your observation in Fish Watcher
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Classification / Names Common names | Synonyms | Catalog of Fishes ( gen. , sp. ) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Perciformes (Perch-likes) > Acanthuridae (Surgeonfishes, tangs, unicornfishes) > Nasinae
Etymology: Naso: Latin, nasus = nose (Ref. 45335 ) .

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

Marine; reef-associated; depth range 1 - 50 m (Ref. 9710 ), usually 1 - 50 m (Ref. 27115 ).   Tropical; 24°C - 28°C (Ref. 27115 ); 30°N - 30°S, 30°E - 89°W

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

Indo-pan-Pacific: East Africa to the Galapagos Is. north to southern Japan, south to the southern Great Barrier Reef and New Caledonia, Tuamotus, throughout Micronesia

Size / Weight / Age

Maturity: L m   ?   range ? - ? cm
Max length : 60.0 cm TL male/unsexed; (Ref. 3145 )

Short description Morphology | Morphometrics

Dorsal spines (total): 6; Dorsal soft rays (total): 26-27; Anal spines : 3; Anal soft rays : 27 - 29. Adults develop a convexly rounded prominent snout and unusually tall dorsal and anal fins. Side of body with vertical blue lines which break up into small blue spots dorsally and ventrally. A broad blue band extending from eye to front of rostral protuberance (Ref 9808).

Biology     Glossary (e.g. epibenthic)

Occurs in deep lagoon and seaward reefs. Found forming loose schools along upper regions of deep drop-offs (Ref. 48637 ). Forms mid-water aggregations off steep slopes during the day to feed on zooplankton. Usually found alone or in pairs. Omnivorous. Has the ability to show or hide its blue markings (Ref. 9710 ). Minimum depth reported taken from Ref. 27115.

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

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. 119314 )

  Least Concern (LC)  ; Date assessed: 06 May 2010

CITES (Ref. 115941 )

Not Evaluated

CMS (Ref. 116361 )

Not Evaluated

Threat to humans


Human uses

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

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Egg development
Larval dynamics
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Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes ( gen. , sp. ) | DiscoverLife | ECOTOX | Faunafri | Fishtrace | GenBank( genome , nucleotide ) | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | National databases | Otolith Atlas of Taiwan Fishes | Public aquariums | PubMed | Reef Life Survey | SeaLifeBase | Tree of Life | Wikipedia( Go , Search ) | World Records Freshwater Fishing | Zoological Record

Estimates of some properties based on models

Preferred temperature (Ref. 115969 ): 25.5 - 29, mean 27.6 (based on 684 cells). Phylogenetic diversity index (Ref. 82805 ):  PD 50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high]. Bayesian length-weight: a=0.02630 (0.01537 - 0.04500), b=3.01 (2.86 - 3.16), in cm Total Length, based on LWR estimates for this species & Genus-body shape (Ref. 93245 ). Trophic Level (Ref. 69278 ):  2.2   ±0.11 se; Based on food items. Resilience (Ref. 69278 ):  Low, minimum population doubling time 4.5 - 14 years (K=0.264; Tmax=45). Vulnerability (Ref. 59153 ):  Moderate vulnerability (38 of 100) . Price category (Ref. 80766 ):   Medium .

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