Shorefishes of the Tropical Eastern Pacific Online Information System
Updated: 06/12/2008  
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Perciformes  -  Acanthuridae  -  Naso  -  Naso hexacanthus

Naso hexacanthus

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no horn
 
blue-grey back, yellowish below
 
 

     

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Naso hexacanthus (Bleeker, 1855)


Sleek unicornfish


Body elongate, oval; upper and lower body profiles symmetrically convex; forehead without horn; mouth small, protrusible, low on head; teeth small, conical, tips slightly depressed & either smooth or with multiple small points; dorsal fin VI, 27-29; anal II, 27-30; pectoral 17-18 rays; pelvics I, 3; 2 pairs of cutting keels on plates on narrow tail base; tail margin straight, without filaments, concave in juveniles;  scales very small, rough; lateral line complete.



Blue-grey to brown above, shading to yellowish brown ventrally; rear margin of operculum and preopercle often dark; tongue black; dorsal olive; tail blue grey, broad olive margin; anal and pelvics yellow-olive; pectoral blue grey, dark margin; courting males  can abruptly develop upper head and upper front of body blue, blue lines and spots on front flank.


Size: 75 cm.

        
        Habitat: reefs and rocky shores; juveniles on reef crests in sheltered habitats; adults in midwater around exposed reef fronts.

Depth: 0-150 m; juveniles usually 5-35 m; adults usually 10-40 m.

An Indo-Pacific species recorded as a vagrant at Clipperton and Cocos Islands.

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