Adults light bluish grey (can be metallic blue perhaps in case of breeding colours) to olivaceous brown, usually paler anteriorly and on throat. Short, dark grey, irregular vertical lines on body ending as rows of spots ventrally. Head with small dark spots or a reticular pattern of lines; a broad-based tapering horn, with oblique dark lines, in front of the eye projecting as much as a head length in front of the mouth. Edges of lips pale blue, opercular membrane white, adjacent body often blue. Caudal fin truncate to slightly rounded, mainly whitish. 2 peduncular plates on each side with only moderate keel development.
Maturity: Lm unknown. Range unknown. Max Length: 60cm FL
Habitat and Ecology:
Occurs on coral reefs and over rocky substrata, inhabiting mid-waters on steep outer lagoon and seaward reef drop-offs (depth 2-122m, usually 4-46m). Juveniles in sheltered habitats usually 2-20m depth. Juveniles and subadults graze on benthic algae; adults feed primarily on zooplankton. Usually occurs in small groups but forms large schools in oceanic locations or on reefs subject to strong currents.
This species is not protected or subject to fishery regulations. It is caught in the fish trap fishery, but is an uncommon component of the catch.
Choat, J.H. et al 2012. Naso brevirostris. The IUCN Red List of Threatened Species 2012: e.T177990A1513480. http://dx.doi.org/10.2305/IUCN.UK.2012.RLTS.T177990A1513480.en. (16/10/18).
EOL (2018). Naso brevirostris Spotted unicornfish http://eol.org/pages/213852/details (16/10/18).
Froese, R. and D. Pauly. Eds. 2018. FishBase. www.fishbase.org, https://www.fishbase.de/summary/Naso-brevirostris (16/10/18)
Randall, J.E. (2001). Surgeonfishes of Hawaii and the World. ISBN: 1-56647-561-9