Naso brevirostris (Cuvier, 1829)
Spotted unicornfish
Naso brevirostris
photo by Randall, J.E.

 Family:  Acanthuridae (Surgeonfishes, tangs, unicornfishes), subfamily: Nasinae
 Max. size:  60 cm FL (male/unsexed)
 Environment:  reef-associated; depth range 2 - 122 m
 Distribution:  Indo-Pacific: Red Sea and East Africa to the Hawaiian, Marquesas and Ducie islands, north to southern Japan, south to Lord Howe Island. Excluding Oman and Persian Gulf (Ref. 86689). Eastern Central Pacific: Gal├ípagos Islands.
 Diagnosis:  Dorsal spines (total): 6-6; Dorsal soft rays (total): 27-29; Anal spines: 2-2; Anal soft rays: 27-30. Adults bluish grey to olivaceous brown in color, commonly pale anteriorly and on cheek and throat; short irregular lines on sides of body; diagonal lines on horn; lip edges blue (Ref. 3145). Subadults with dark spots on head and body (Ref. 3145). Juveniles lack the prominent horn of adults (Ref. 1602). Description: Characterized further by having whitish caudal fin; sometimes with broad pale zone on anterior body; pair of bony plates on caudal peduncle developing knife-like keels in adults; greatest depth of body 2.3 (subadults)-2.7 in SL (Ref. 90102).
 Biology:  Inhabit mid-waters along steep outer lagoon and seaward reef drop-offs. Also found along rocky shores (Ref. 30573, 48637). Benthopelagic (Ref. 58302). Usually in small groups but form large schools in oceanic locations or on reefs subject to strong currents (Ref. 48637). Juveniles and subadults feed on benthic algae; adults feed on zooplankton. Pair spawning has been observed. Caught with nets (Ref. 30573).
 IUCN Red List Status:   (Ref. 96402)
 Threat to humans:  reports of ciguatera poisoning
 Country info:   

 Entered by: Capuli, Estelita Emily - 15.07.92
 Modified by: Orta├▒ez, Auda Kareen - 03.01.08
 Checked by: Capuli, Estelita Emily - 30.08.94

Source and more info: For personal, classroom, and other internal use only. Not for publication.

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