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Naso unicornis  (Forsskål, 1775)

Bluespine unicornfish
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Image of Naso unicornis (Bluespine unicornfish)
Naso unicornis
Picture by Randall, J.E.

Classification / Names Noms communs | Synonymes | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinoptérygiens (poissons à nageoires rayonnées) > Perciformes (Perch-likes) > Acanthuridae (Surgeonfishes, tangs, unicornfishes) > Nasinae
Etymology: Naso: Latin, nasus = nose (Ref. 45335).

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

; marin récifal; profondeur 1 - 180 m (Ref. 89972).   Tropical; 26°C - 29°C (Ref. 27115); 35°N - 33°S, 30°E - 128°W

Distribution Pays | Zones FAO | Écosystèmes | Occurrences | Point map | Introductions | Faunafri

Indo-Pacific: Red Sea and East Africa (Ref. 3145) to the Hawaiian, Marquesas and Tuamoto islands, north to southern Japan, south to Lord Howe and Rapa islands. Presence in Somalia to be confirmed (Ref. 30573).

Taille / Poids / Âge

Maturity: Lm ?  range ? - ? cm
Max length : 70.0 cm FL mâle / non sexé; (Ref. 9710); common length : 50.0 cm TL mâle / non sexé; (Ref. 3146)

Description synthétique Morphologie | Morphométrie

Épines dorsales (Total): 6; Rayons mous dorsaux (Total): 27-30; Épines anales 2; Rayons mous anaux: 27 - 30. This species is characterized by the following: body depth 1.8 (in subadults) - 2.6 (adults) in SL; presence of a tapering body horn in adults projecting anteriorly at level of eye but not extending in front of mouth (horn first as a bump on forehead at a length of about 12 cm); dorsal profile from snout to horn straight, angle of about 45°; 2 peduncular plates with well-developed forward-curving knife-like spines; emarginate caudal fin when young, truncate with filamentous lobes in adult; olivaceous with blue peduncular plates and spines; dorsal and anal fins yellowish with narrow blue stripes (Ref. 27362).

Biologie     Glossaire (ex. epibenthic)

Inhabit channels, moats, lagoon and seaward reefs with strong surge (Ref. 48637). Benthopelagic (Ref. 58302). Typically occurring in small groups. Sometimes solitary (Ref. 90102).Juveniles in shallow protected bays and harbours (Ref. 48637). Mainly diurnal, feed on coarse leafy brown algae like Sargassum. Pair-spawning has been observed.

Life cycle and mating behavior Maturité | Reproduction | Frai | Œufs | Fécondité | Larves

Spawn in pairs (Ref. 240).

Référence principale Upload your references | Références | Coordinateur : Randall, John E. | Collaborateurs

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

Statut dans la liste rouge de l'IUCN (Ref. 115185)

CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Menace pour l'homme

  Reports of ciguatera poisoning (Ref. 4795)




Utilisations par l'homme

Pêcheries: commercial; pêche sportive: oui; Aquarium: Commercial
FAO(pêcheries: production; publication : search) | FishSource | Sea Around Us

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Estimates of some properties based on models

Preferred temperature (Ref. 115969): 23.4 - 28.8, mean 27.4 (based on 1536 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02344 (0.01724 - 0.03188), b=2.95 (2.87 - 3.03), in cm Total Length, based on LWR estimates for this species (Ref. 93245).
Niveau trophique (Ref. 69278):  2.2   ±0.11 se; Based on food items.
Résilience (Ref. 69278):  Faible, temps minimum de doublement de population : 4,5 à 14 années (K=0.14).
Vulnérabilité (Ref. 59153):  Low to moderate vulnerability (32 of 100) .
Catégorie de prix (Ref. 80766):   Medium.