Naso thynnoides (Cuvier, 1829)
Naso thynnoides (Cuvier, 1829)
Genus: ,

Scientific Name: Naso thynnoides

English Name: Oneknife unicornfish

Creole Name: Korn

French Name:

IUCN Red List Status: Least Concern (LC)


Dorsal spines: 4; Dorsal rays: 28-30; Anal spines: 2; Anal rays: 27-29.

Body oval and elongate. Grey, paler ventrally, with narrow dark bluish-grey bars on body and irregular spots on head. Oblique groove on snout below nostrils reaching 
half way from eye to mouth. A broad diffuse yellow stripe on side of body. Single dusky peduncular plate with semi-circular keel. Caudal fin emarginated and bluish grey. 


Maturity: Lm unknown. Range unknown. Max Length: 40cm FL

Habitat and Ecology:

Reef associated occurring in lagoons to outer seaward reefs (depth 2-40m, typically more than 10m). Occurs singly or in schools. Feeds on zooplankton and algae. 
Sleeps on reefs at night, taking on a disruptive mottled pattern. 

Fishery Status:

This species is not protected or subject to fishery regulations. It is a rare component of the catch.


The colour of the photo’d specimen has been altered by storage on ice.


Abesamis, R. et al. (2012). Naso thynnoides. The IUCN Red List 2012: e.T177980A1509761. (16/10/18).
Froese, R. & D. Pauly. Eds. (2018). FishBase. (16/10/18)
Randall, J.E. (2001). Surgeonfishes of Hawaii and the World. ISBN: 1-56647-561-9


Nevill, J.E.G. (2019). Naso thynnoides, Oneknife unicornfish. Seychelles Seatizens. (edited 17/06/22).

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