Naso thynnoides (Cuvier, 1829)
Naso thynnoides (Cuvier, 1829)

Genus: ,

Scientific Name: Naso thynnoides (Cuvier, 1829)

English Name: Oneknife unicornfish

Creole Name:

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 of Threatened Species 2012: e.T177980A1509761. (16/10/18).

Froese, R. and D. Pauly. Eds. 2018. FishBase (16/10/18)

Randall, J.E. (2001). Surgeonfishes of Hawaii and the World. ISBN: 1-56647-561-9


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