Naso brachycentron

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA ACTINOPTERYGII PERCIFORMES ACANTHURIDAE

Scientific Name: Naso brachycentron
Species Authority: (Valenciennes, 1835)
Common Name(s):
English Humpback Unicornfish, Ringtailed Unicornfish
French Nason Bossu
Synonym(s):
Naseus brachycentron Valenciennes, 1835
Naso rigoletto Smith, 1951
Prionolepis hewitti Smith, 1931

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2012
Date Assessed: 2010-05-04
Assessor(s): Abesamis, R., Clements, K.D., Choat, J.H., McIlwain, J., Myers, R., Rocha, L.A., Russell, B. & Stockwell, B.
Reviewer(s): Edgar, G. & Kulbicki, M.
Justification:
Naso brachycentron is widespread throughout the Indo-Pacific region. It is occasionally found in most parts of its range. It is a targeted food fish but there have been no indications of population declines by fishing. There are no major threats and it is found in marine protected areas. It is therefore listed as Least Concern.

Geographic Range [top]

Range Description:Naso brachycentron is found from East Africa to French Polynesia, northwards to Ryukyu Islands, Japan, southwards to the Great Barrier Reef, Vanuatu and New Caledonia. Records from Hong Kong (To and Situ 2005) and Cook Islands (M. Kulbicki pers. comm. 2011) need to be verified.
Countries:
Native:
Australia; British Indian Ocean Territory; Christmas Island; Comoros; Disputed Territory (Spratly Is.); Fiji; French Polynesia; French Southern Territories (Mozambique Channel Is.); Guam; Indonesia; Japan; Kenya; Madagascar; Malaysia; Maldives; Marshall Islands; Mauritius; Mayotte; Micronesia, Federated States of ; Mozambique; New Caledonia; Niue; Northern Mariana Islands; Palau; Papua New Guinea; Philippines; Réunion; Seychelles; Solomon Islands; South Africa; Taiwan, Province of China; Tanzania, United Republic of; Timor-Leste; Tonga; Vanuatu; Yemen
FAO Marine Fishing Areas:
Native:
Indian Ocean – eastern; Indian Ocean – western; Pacific – eastern central; Pacific – northwest; Pacific – western central
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population: Naso brachycentron was recorded as occasional in terms of relative abundance in Milne Bay Province, northern Bismarck Sea, Papua New Guinea and in Raja Ampat, Indonesia (Allen 2003, 2009, 2003b). It is rare in the American Samoa National Park (National Park of Samoa Checklist of Fishes, accessed 21 April 2010). In the Philippines, it is occasional in the central Visayas (R. Abesamis, C. Nanola and B. Stockwell pers. comm. 2010) and common in Tubbataha (S. Conales, Jr. pers. comm. 2010).

In Kenya, landings during 1978-2001 for families that are less important in commercial catches (e.g., scarinae and Acanthuridae) showed rising catches (1978-1984) followed by a general decline during the 1990s, but the landings for the scarinae showed a rising trend in recent years (Kaunda-Arara et al. 2003).
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: Naso brachycentron adults may be seen in shallow reef areas but are usually difficult to approach. It is occasionally encountered in small aggregations (Randall 2001a). It feeds on macroalgae (Choat et al. 2004). It is classified as a browser (Choat pers obs. in Green and Bellwood 2009). Maximum age recorded was 31 years (Choat and Robertson 2002a).

The sexes are separate and there is evidence of sexual dimorphism in the caudal knives which are relatively larger in males (J.H. Choat pers. comm. 2010).
Systems: Marine

Use and Trade [top]

Use and Trade: Naso brachycentron is harvested for food. It is caught in basket traps in Shoals Rodrigues (Anderson 2005).

Threats [top]

Major Threat(s): There are no major threats known for this species.

Surgeonfishes show varying degrees of habitat preference and utilization of coral reef habitats, with some species spending the majority of their life stages on coral reef while others primarily utilize seagrass beds, mangroves, algal beds, and /or rocky reefs. The majority of surgeonfishes are exclusively found on coral reef habitat, and of these, approximately 80% are experiencing a greater than 30% loss of coral reef area and degradation of coral reef habitat quality across their distributions. However, more research is needed to understand the long-term effects of coral reef habitat loss and degradation on these species' populations. Widespread coral reef loss and declining habitat conditions are particularly worrying for species that recruit into areas with live coral cover, especially as studies have shown that protection of pristine habitats facilitate the persistence of adult populations in species that have spatially separated adult and juvenile habitats (Comeros-Raynal et al. 2012).

Conservation Actions [top]

Conservation Actions: There are no species-specific conservation measures in place for this species. However, its distribution overlaps several marine protected areas within its range.

Bibliography [top]

Allen, G.R. 2003. Appendix 5. List of the reef fishes of Milne Bay Province, Papua New Guinea. In: G.R. Allen, J. P. Kinch, S.A. McKenna, and P. Seeto (eds), A Rapid Marine Biodiversity Assessment of Milne Bay Province, Papua New Guinea–Survey II (2000), pp. 172. Conservation International, Washington, DC, USA.

Allen, G.R. 2003b. Appendix 1. List of the Reef Fishes of the Raja Ampat Islands. In: R. Donnelly, D. Neville and P.J. Mous (eds), Report on a rapid ecological assessment of the Raja Ampat Islands, Papua, Eastern Indonesia, held October 30 – November 22, 2002. The Nature Conservancy - Southeast Asia Center for Marine Protected Areas, Sanur, Bali.

Allen, G.R. 2009. Coral Reef Fish Diversity. In: R. Hamilton, A. Green and J. Almany (eds), Rapid Ecological Assessment: Northern Bismarck Sea, Papua New Guinea. Technical Report of survey conducted August 13 to September 7, 2006. The Nature Conservancy, South Brisbane, Queensland.

Anderson, R.C. 2005. Impacts of Marine Reserves in Rodrigues: Report of a training visit to Shoals Rodrigues, September 2005. 26. Available at: http://spade97.ncl.ac.uk/tcmweb/tmr/anderson_2005.pdf.

Choat, J.H. and Robertson, D.R. 2002a. Age-based studies on coral reef fishes. In: P.F. Sale (ed.), Coral reef fishes: dynamics and diversity in a complex ecosystem, pp. 57-80. Academic Press, Burlington, San Diego and London.

Choat, J.H., Robbins, W.D. and Clements, K.D. 2004. The trophic status of herbivorous fishes on coral reefs. Marine Biology 145: 445-454.

Comeros-Raynal, M.T., Choat, J.H., Polidoro, B., Clements, K.D., Abesamis, R., Craig, M.T., Lazuardi, M.E., McIlwain, J., Muljadi, A., Myers, R.F., et al.. 2012. The likelihood of extinction of iconic and dominant components of coral reefs: the parrotfishes and surgeonfishes. PLoS ONE http://dx.plos.org/10.1371/journal.pone.0039825.

Green, A.L. and Bellwood, D.R. 2009. Monitoring functional groups of herbivorous reef fishes as indicators of coral reef resilience – A practical guide for coral reef managers in the Asia Pacific region. IUCN, Gland, Switzerland.

IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.2). Available at: http://www.iucnredlist.org. (Accessed: 17 October 2012).

Kaunda-Arara, B., Rose, G.A., Muchiri, M.S. and Kaka, R. 2003. Long-term Trends in Coral Reef Fish Yields and Exploitation Rates of Commercial Species from Coastal Kenya. Western Indian Ocean Journal of Marine Science 2(2): 105-116.

National Park of American Samoa. 2008. Fishes of National Park of American Samoa Checklist of Fishes Family Name Listing. Available at: http://www.botany.hawaii.edu/basch/uhnpscesu/htms/npsafish/family/acanthur.htm. (Accessed: 21 April).

Randall, J.E. 2001a. Surgeonfishes of the world. Mutual Publishing and Bishop Museum Press, Hawai'i, Honolulu, Hawaii.

Reeson, P.H. 1983. The biology, ecology and bionomics of the surgeonfishes, Acanthuridae. In: J.L. Munro (ed.), Caribbean coral reef fishery resources, pp. 178-190.

To, Allen and Situ, A. 2005. Newcomers to the local fish list, or unwelcome visitors. Available at: http://www.hku.edu/ecology/porcupine/por32pdf/por32-p05-10.pdf. (Accessed: 3 March).


Citation: Abesamis, R., Clements, K.D., Choat, J.H., McIlwain, J., Myers, R., Rocha, L.A., Russell, B. & Stockwell, B. 2012. Naso brachycentron. In: The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 24 November 2014.
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