Scientific Name: Naso annulatus

English Name: Whitemargin unicornfish

Creole Name: Korn

French Name: Nason à rostre long

IUCN Red List Status: Least Concern (LC)


Dorsal spines: 5; Dorsal rays: 28-29; Anal spines: 2; Anal rays: 27-28. 

Medium to large unicornfish. At approximately 20 cm TL a long horn begins to develop from a bump anterior to the eye.The horn of mature fish can be as 
long as the head. Dorsal profile of snout  to base of horn forming an angle of about 60° to the horizontal. Body tapers to a narrow caudal peduncle 
exhibiting two scutes each bearing a strong keel. Caudal fin truncate  in sub-adults, scalloped in adults, the large males with a long trailing filament 
from each corner.

Colour. Base colour light blusih grey to brown paler ventrally. No dark markings on head or body. Lips white. Juveniles and sub-adults with 
a white ring around caudal peduncle and a white posterior edge on the caudal fin. Sub-adults develop a dark submarginal zone on caudal fin. Caudal fin 
membranes white. 


Maturity: Unknown. Max length : 100.0 cm TL.

Habitat and Ecology:

Fishery Status:

This species is not protected or subject to fishery regulations. It is caught in the trap fishery, adults are likely subject to the handline fishery.  


Photo. shows a sub-adult caught in fish trap east coast Mahe, October 2023.


Abesamis, R. et al. (2012). Naso annulatus. The IUCN Red List 2012: (09/11/23).
Froese, R. & D. Pauly. Eds. (2023). FishBase. Naso annulatus. (09/11/23). 
McGrouther, M. (2022). Ringtail Unicornfish, Naso annulatus. (09/11/23).   
Randall, J.E. (2001). Surgeonfishes of Hawaii and the World. ISBN: 1-56647-561-9.

Fish Family:

Start typing and press Enter to search

Generic filters
Exact matches only
Shopping Cart

No products in the cart.