Humpnose Unicornfish, Naso tonganus (Valenciennes 1835)


Other Names: Bluntnose Unicornfish, Bulbnose Unicornfish, Humphead Unicornfish, Hump-head Unicornfish, Hump-headed Unicorn-fish, Hump-nose Unicorn

A Humpnose Unicornfish, Naso tonganus, being cleaned by Bluestreak Cleaner Wrasses at the Cod Hole near Lizard Island, GBR, Queensland. Source: Lyle Vail / Lizard Island Research Station. License: CC By Attribution

Summary:
A brownish-grey surgeonfish becoming yellowish-grey below, with a  rounded tuberosity on the snout, irregular black and pale spots scattered below the hump on the anterior part of body, dorsal fin dark with a pale bluish margin, and a broad blackish submarginal band on pectoral and caudal fins.
This species was previously considered a synonym of Naso tuberosus (Johnson 2002).

Cite this page as:
Dianne J. Bray, Naso tonganus in Fishes of Australia, accessed 27 Sep 2020, http://136.154.202.208/home/species/2200

Humpnose Unicornfish, Naso tonganus (Valenciennes 1835)

More Info


Distribution

Shark Bay to North West Cape, Rowley Shoals and Scott Reef, WA, Ashmore Reef, Timor Sea, Cocos (Keeling) Islands and Christmas Island, and the northern Great Barrier Reef, QLD to Jervis Bay, NSW, also Coringa-Herald Reserve and Lihou Reef, Coral Sea. The species occurs elsewhere in the tropical, Indo-west-central Pacific, from East Africa to Samoa and throughout Micronesia, northwards to Ryukyu Islands, Japan and southwards to the Great Barrier Reef and New Caledonia.

Features

Dorsal fin V, 28; Anal fin II, 26; Pectoral fin 16; Pelvic fin I, 3; Gill rakers on anterior of first arch 8+9=17; Upper jaw teeth 43.
Body shallow, maximum body depth 36.1; snout with a bulbous tuberosity, rounded in profile, arising from base of upper lip, extending anteriorly well beyond snout tip; nasal groove deep, concave, extending to anterior margin of head; dorsal profile of with prominent narrowly based hump, highest at about base of 5th dorsal-fin spine; jaws protruding; teeth denticulate distally; caudal peduncle with two bony plates on side, each with a broad keel-like strong spine, caudal fin slightly emarginate with bluntly angular lobes; scale tubercles with numerous short lanceolate spinules, spinules at posterior of scale slightly elongated.

Feeding

Herbivore - browses on turfing and filamentous red and green algae.

Fisheries

An important food fish in some parts of its range.

Etymology

Named tonganus after Tonga, the type locality.

Species Citation

Naseus tonganus Valenciennes, 1835, Hist. Nat. Poiss. 10: 292. Type locality: Tongatapu.

Author

Dianne J. Bray

Humpnose Unicornfish, Naso tonganus (Valenciennes 1835)

References


Allen, G.R. 1997. Marine Fishes of Tropical Australia and South-east Asia. Perth : Western Australian Museum 292 pp. 106 pls.

Allen, G.R., Steene, R.C. & Orchard, M. 2007. Fishes of Christmas Island. Christmas Island : Christmas Island Natural History Association 2 edn, 284 pp.

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

Allen, G.R. & Swainston, R. 1988. The Marine Fishes of North-Western Australia. A field guide for anglers and divers. Perth, WA : Western Australian Museum vi 201 pp., 70 pls.

Ceccarelli, D., Choat, J.H., Ayling, A.M., Richards, Z., van Herwerden, L., Ayling, A., Ewels, G., Hobbs, J. –P. & Cuff, B. 2008. Coringa-Herald National Nature Reserve Marine Survey – 2007. Report to the Department of the Environment, Water, Heritage and the Arts by C&R Consulting and James Cook University. 80 pp.

Chiba, S.N. & Matsuura, K. 2012. A Record of Bulbnose Unicornfish, Naso tonganus (Valenciennes, 1835), from the Tokara Group, Southern Japan. Bull. Natl. Mus. Nat. Sci., Ser. A 38(1): 49–52.

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

Choat, J.H., K.D. Clements & W.D. Robbins. (2004). The trophic status of herbivorous fishes on coral reefs 2: Food processing modes and trophodynamics. Marine Biology 145: 445-454.

Coleman, N. 1981. Australian Sea Fishes North of 30°S. Lane Cove, NSW : Doubleday Australia Pty Ltd 297 pp.

Crossman, D.J., J.H. Choat & K.D. Clements (2005). Nutritional ecology of nominally herbivorous fishes on coral reefs, Marine Ecology Progress Series 296: 129-142.

Hoey, A.S. (2010). The ecosystem role of macroalgal browsing fishes on coral reefs. Ph.D thesis, James Cook University. 

Hutchins, J.B. 1990. Fish survey of South Passage, Shark Bay, Western Australia. pp. 263-278 in Berry, P.F., Bradshaw, S.D. & Wilson, B.R. (eds). Research in Shark Bay: Report of the France-Australe Bicentenary Expedition Committee. Perth : Western Australian Museum.

Hutchins, J.B. 1994. A survey of the nearshore reef fish fauna of Western Australia's west and south coasts — The Leeuwin Province. Records of the Western Australian Museum, Supplement 46: 1-66 figs 1-6

Hutchins, J.B. 2001. Biodiversity of shallow reef fish assemblages in Western Australia using a rapid censusing technique. Records of the Western Australian Museum 20: 247-270.

Hutchins, J.B., Williams, D.McB., Newman, S.J., Cappo, M. & Speare, P. 1995. New records of fishes for the Rowley Shoals and Scott/Seringapatam Reefs, off north-western Australia. Records of the Western Australian Museum 17: 119-123.

Johnson, J.W. 2002. Naso mcdadei, a new species of unicornfish (Perciformes: Acanthuridae), with a review of the Naso tuberosus complex. Australian Journal of Zoology 50: 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. (2003). Molecular phylogeny, temporal patterns of lineage diversification and phylogeography of the surgeonfish genus Naso (Acanthuridae). Ph.D. thesis, James Cook University.

Kuiter, R.H. 1992. Tropical Reef-Fishes of the Western Pacific, Indonesia and Adjacent Waters. Jakarta : PT Gramedia Pustaka Utama 314 pp. pls.

Kuiter, R.H. & Debelius, H. 2001.Surgeonfishes, Rabbitfishes and Their Relatives. A comprehensive guide to Acanthuroidei. Chorleywood, U.K. : TMC Publishing 208 pp.

Marshall, T.C. 1964. Fishes of the Great Barrier Reef and Coastal Waters of Queensland. Sydney : Angus & Robertson 566 pp. 136 pls.

Oxley, W.G., Ayling, A.M., Cheal, A.J. & Thompson, A.A. 2003. Marine surveys undertaken in the Coringa-Herald National Nature Reserve, March-April 2003. Townsville : Australian Institute of Marine Science 59 pp.

Oxley, W.G., Emslie, M., Muir, P. & Thompson, A.A. 2004. Marine surveys undertaken in the Lihou Reef National Nature Reserve, March 2004. Townsville : Australian Institute of Marine Science i-vii, 1-67 pp.

Randall, J.E. 2001. Surgeonfishes of Hawai'i and the World. Honolulu : Mutual Publishing and Bishop Museum Press 125 pp.

Randall, J.E., Allen, G.R. & Steene, R. 1990. Fishes of the Great Barrier Reef and Coral Sea. Bathurst : Crawford House Press 507 pp. figs.

Randall, J.E., Allen, G.R. & Steene, R. 1997. Fishes of the Great Barrier Reef and Coral Sea. Bathurst : Crawford House Press 557 pp. figs.

Russell, B.C. 1983. Annotated checklist of the coral reef fishes in the Capricorn-Bunker group, Great Barrier Reef, Australia. Great Barrier Reef Marine Park Authority. Special Publication Series 1: 1-184 figs 1-2

Russell, B.C., Larson, H.K., Hutchins, J.B. & Allen, G.R. 2005. Reef fishes of the Sahul Shelf. The Beagle, Records of the Museums and Art Galleries of the Northern Territory Supplement 1 2005: 83-105.

Quick Facts


CAAB Code:37437003

Conservation:IUCN Least Concern

Depth:3-20 m

Habitat:Reef associated

Max Size:60 cm TL

Species Image Gallery

Species Maps

CAAB distribution map