Naso hexacanthus   (Bleeker,  1855) (Fish)
Organism information awaits expert curation
Class: Actinopterygii

Image copyrights: John E. Randall

Size: 71 cm.

Color: Brownish grey, shading ventrally to yellowish; opercular membrane dark brown; dorsal and anal fins yellowish with faint diagonal brown bands and a blue margin

In a young specimen of 158 mm the profile of the head, which is deeper than long, is very convex, in an old specimens of 450 mm the head in longer than deep, the snout being relatively much longer and the profile sloping down in a slightly convex line. Height 2.4-2.9, 2.9-3.2 in length with caudal. Head 4.1-4.4, 4.8-4.9 in length with caudal. Eye 3.2-4.7, 1.7 in snout in young, 2.8 in old specimens. Inter orbital space convex and somewhat keeled in young, slightly less than eye, in old specimens the eye goes 1.6 in the very convex inter orbital space. About 22 slightly serrated pointed teeth in each ramus of both jaws. Third dorsal spine longest, equal to or somewhat shorter than snout. First anal spine equal to or a little more than half length of snout. Pectorals as long as snout or as snout and half eye in young. Ventral spine nearly equal to (in old specimens) or a little more than distance between corner of mouth and eye. Caudal emarginate. Forms schools. Mainly diurnal.

Remarks: Values in above description denote proportions.

Synonym (s)
Priodon hexacanthus Bleeker, 1855
Naseus hexacanthus Steindachiner, 1900
Callicanthus metoposophron Jenkins, 1904
Callicanthus metoposophron Jordan and Evermann, 1905
Callicanthus metoposophron Jordan and Snyder, 1905
Naso hexacanthus Herre, 1927
Naso hexacanthus Fowler, 1928
Naso hexacanthus Fowler and Bean, 1929
Naso hexacanthus P. J. Schmidt, 1930
Naso hexacanthus Fowler, 1938
Naseus vomer Klunzinger, 1871
Naso thorpei Smith, 1966
Naso vomer (Klunzinger, 1871)

Common Name (s)
• Sleek Unicornfish (English)
Economic Importance and Threats
Importance:  Commercial
(Marketed fresh)

Habitat:  Pelagic
Trophic Level:  Secondary Consumer
Prey:  Zooplankton, crab larvae, arrow worms, pelagic tunicates, and occasionally filamentous red algae.


• Andaman and Nicobar Islands INDIA
• Andaman Sea (Lat: 13.71) (Long: 93.26) INDIA (Record: 02/1985-06/1987) (Depth: 75 mts)

Literature Source(s)
  • Devi, K and Rao, DV (2003) A field guide to the fishes of Acanthuridae (surgeonfishes) and Siganidae (rabbitfishes) of Andaman and Nicobar Islands 42 Available at - NCL, Pune
  • Rouphael, T; Turak, E and Jon, B Seagrasses and mangroves of Yemen's Red Sea 41-89
  • Ohman, M; Rajasuriya, A and Olafsson, E (1997) Reef fish assemblages in north western Sri Lanka: Distribution patterns and influences of fishing practises Enviornmental Biology of Fishes Kluwer Academic Publishers 49 45-61
  • Letourneur, Y; Chabanet, P; Durville, P; Taquet, M; Teissier, E; Parmentier, M; Quero, JC and Pothin, K (2004) An updated checklist of the marine fish fauna of Reunion Island, south-western Indian Ocean Cybium 28(3) 199-216
  • Kemp, JM (1998) Zoogeography of the coral reef fishes of the Socotra Archipelago Journal of Biogeography 25 919-933
  • Allen, GR (2005) Reef fishes of northwestern Madagascar RAP Bulletin of Biological Assessment 31 39-48
  • Durville, P; Chabanet, P and Quod, JP (2003) Visual Census of the Reef Fishes in the Natural Reserve of the Glorieuses Islands (Western Indian Ocean) Western Indian Ocean J. Mar. Sci. WIOMSA 2 95-104
  • Chabanet, P and Patrick, D (2005) Reef Fish Inventory of Juan De Novas Natural Park (Western Indian Ocean) Western Indian Ocean Journal Marine Sciences 2005 WIOMSA 4 145-162
  • Allen, GR and Mohammed, A (2003) Coral Reef Fishes of Indonesia Zoological Studies 42(1) 26299 Available at - Digital Information Resource Center, Pune.
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Beaufort, LF and Chapman, WM (1951) The fishes of the Indo-Australian Archipelago A. J. Reprints agency, Karol Bagh, New Delhi 9 484 pp Available at - NIO, Goa
  • Encyclopedia of Life Available at -
  • Fischer, W and Bianchi, G (Eds.) (1984) FAO species identification sheets for fishery purposes. Western Indian Ocean; (Fishing area 51). FAO, Rome 1 Available at -
  • Balachandran, K and Nizar, MA (1990) A check list of fishes of the Exclusive Economic Zone of India collected during the research cruises of FORV Sagar Sampada Proceedings of the first workshop on scientific results of FORV Sagar Sampada CMFRI, Cochin 305-324 Available at -

Page last updated on:2011-02-07

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