Squarenose Unicornfish, Naso mcdadei Johnson 2002

Squarenose Unicornfish, Naso mcdadei, on the front slope of the far northern outer Great Barrier Reef, Torres Strait, Queensland, November 2017, depth 30 m. Source: Tony Ayling / iNaturalist.org. License: CC by Attribution-NonCommercial

Cite this page as:
Dianne J. Bray, Naso mcdadei in Fishes of Australia, accessed 14 Jun 2024, https://fishesofaustralia.net.au/Home/species/1041

Squarenose Unicornfish, Naso mcdadei Johnson 2002

More Info


North of Dampier Archipelago, WA, east of Ashmore Reef, Timor Sea, and off Cape Grenville to off Stradbroke Island, QLD. Elsewhere the species is widespread in deeper waters of the tropical, Indo-west Pacific, from East Africa to the Great Barrier Reef, Australia, to southern Taiwan.
Inhabits steep rocky or coral drop-offs and deeper non-reef areas.

Species Citation

Naso mcdadei Johnson, 2002, Aust. J. Zool. 50: 295, figs 1-4. Type locality: Flat Rock off Stradbroke Island, QLD [27°23'S, 153°33'E]. 


Dianne J. Bray

Squarenose Unicornfish, Naso mcdadei Johnson 2002


Allen, G.R. & Erdmann, M.V. 2012. Reef fishes of the East Indies. Perth : Tropical Reef Research 3 vols, 1260 pp.

Choat, J.H., Abesamis, R., Clements, K.D., McIlwain, J., Myers, R., Nanola, C., Rocha, L.A., Russell, B. & Stockwell, B. 2012. Naso mcdadei. The IUCN Red List of Threatened Species. Version 2015.2. . Downloaded on 02 August 2015.

Gloerfelt-Tarp, T. & Kailola, P.J. 1984. Trawled Fishes of Southern Indonesia and Northwest Australia. Jakarta : Dir. Gen. Fish. (Indonesia), German Tech. Coop., Aust. Dev. Ass. Bur. 406 pp. (p. 252 as Naso tuberosus)

Johnson, J.W. 2002. Naso mcdadei, a new species of unicornfish (Perciformes: Acanthuridae), with a review of the Naso tuberosus species complex. Australian Journal of Zoology 50(3): 293-311.

Johnson, J.W. 2010. Fishes of the Moreton Bay Marine Park and adjacent continental shelf waters, Queensland, Australia. pp. 299-353 in Davie, P.J.F. & Phillips, J.A. Proceedings of the Thirteenth International Marine Biological Workshop, The Marine Fauna and Flora of Moreton Bay. Memoirs of the Queensland Museum 54(3)

Klanten, S.O., van Herwerden, L., Choat, J.H. & Blair, D. 2004. Patterns of lineage diversification in the genus Naso (Acanthuridae). Molecular Phylogenetics and Evolution 32: 221-235.

Randall, J.E., 2002. Surgeonfishes of the world. Mutual Publishing and Bishop Museum Press, Hawai'i. 123 pp. 

Sainsbury, K.J., Kailola, P.J. & Leyland, G.G. 1985. Continental Shelf Fishes of Northern and North-Western Australia. Canberra : Fisheries Information Service 375 pp. figs & pls. (p. 346, as Naso tuberosus)

Quick Facts

CAAB Code:37437003

Conservation:IUCN Least Concern

Depth:5-65 m

Habitat:Reef associated

Max Size:75 cm SL

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CAAB distribution map