Luzonichthys williamsi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Perciformes Serranidae

Scientific Name: Luzonichthys williamsi Randall & McCosker, 1992
Taxonomic Notes: Subfamily: Anthiinae

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2010
Date Assessed: 2009-02-04
Assessor(s): Allen, G.R. & Sadovy, Y.J.
Reviewer(s): Collen, B., Richman, N., Beresford, A., Chenery, A. & Ram, M.
Contributor(s): De Silva, R., Milligan, H., Lutz, M., Batchelor, A., Jopling, B., Kemp, K., Lewis, S., Lintott, P., Sears, J., Wilson, P. & Smith, J. and Livingston, F.
Luzonichthys williamsi has been assessed as Least Concern. Although it has a restricted distribution, the reefs within this species range are reported to be relatively healthy, no significant threats are known and the population is likely to be stable.

Geographic Range [top]

Range Description:Luzonichthys williamsi is only known from 5 specimens and is endemic to the Loyalty Islands, France in the western Pacific. It may also be found to occur around New Caledonia (G. R. Allen pers. comm. 2009).
Countries occurrence:
New Caledonia
FAO Marine Fishing Areas:
Pacific – western central
Additional data:
Lower depth limit (metres):50
Upper depth limit (metres):22
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Luzonichthys williamsi is only known from 5 specimens.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:Unknown

Habitat and Ecology [top]

Habitat and Ecology:The basslet, Luzonichthys williamsi, is a midwater coral reef species that has a depth range of 22 to 50 m. It is seen on the outer-reef slope in groups feeding on zooplankton. It has also been collected over patches of coral rubble. This is a small short-lived species.

This species co-occurs with the very similar Luzonichthys whitleyi, and L. waitei, and may well occur in mixed-species aggregations.
Congregatory:Congregatory (and dispersive)

Threats [top]

Major Threat(s): Luzonichthys williamsi may be taken for the aquarium trade as small serranids from the Anthiinae sub-family are known to be of particular value within the trade (FAO 1999), but this is unlikely to be driving rapid declines. The restricted range of this species also implies that it may be at risk from intrinsic factors which affect small populations.

Due to this species association with coral reef habitats, it is likely to be undergoing declines in areas impacted by destructive fishing practices. In 2001, the reefs around the Loyalty Islands were impacted by a number of threats including Crown of Thorns starfish outbreaks and coral bleaching, however they are showing good signs of recovery (Wilkinson 2004). Overall, the coral reefs within this species range are considered to be in good condition.

Studies from the neighbouring island of New Caledonia have shown that surrounding coastal waters are subjected to large inputs of metals, mainly due to nickel production. In addition, natural erosion of the soils associated with tropical rainfall, urban development and lack of efficient wastewater treatment (Ambastian et al. 1997) may pose a threat in the future.

At present there don't appear to be any significant threats or reason to assume the species is undergoing declines.

Conservation Actions [top]

Conservation Actions: There are no known species-specific conservation measures in place for Luzonichthys williamsi, however this species distribution range may cover a number of marine protected areas.

Further research is needed on the population numbers, threats and possible harvest of this species.

Errata [top]

Errata reason: This errata assessment has been created because the map was accidentally left out of the version published previously.

Classifications [top]

9. Marine Neritic -> 9.8. Marine Neritic - Coral Reef -> 9.8.3. Foreslope (Outer Reef Slope)
9. Marine Neritic -> 9.8. Marine Neritic - Coral Reef -> 9.8.6. Inter-Reef Rubble Substrate

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
In-Place Education
1. Residential & commercial development -> 1.1. Housing & urban areas
♦ timing:Future ♦ scope:Unknown ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

5. Biological resource use -> 5.4. Fishing & harvesting aquatic resources -> 5.4.6. Motivation Unknown/Unrecorded
♦ timing:Past, Unlikely to Return    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

8. Invasive and other problematic species, genes & diseases -> 8.1. Invasive non-native/alien species/diseases -> 8.1.2. Named species [ Acanthaster planci ]
♦ timing:Past, Unlikely to Return    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

9. Pollution -> 9.1. Domestic & urban waste water -> 9.1.3. Type Unknown/Unrecorded
♦ timing:Future ♦ scope:Unknown ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.5. Threats
3. Monitoring -> 3.1. Population trends

Bibliography [top]

Ambastian, P., Fernex, F., Bernat, M., Parron, C. and Lecolle, J. 1997. High metal inputs to closed seas: the New Caledonia lagoon. Journal of Geochemistry Exploration 59: 59-74.

Food and Agriculture Organization of the United Nations. 1999. The living marine resources of the western central Pacific. Bony fishes part 2 (Mugilidae to Carangidae). FAO, Rome, Italy.

Froese, R. and Pauly, D. 2006. FishBase. Available at:

Hureau, J.C. 1991. La base de données GICIM: Gestion informatisée des collections ichthyologiques du Muséum. In: J. Allardi and P. Keith (eds), Atlas preliminaire des poissons d'eau douce de France, pp. 225-227. Museum D'Histoire Naturelle, Paris, France.

IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.4). Available at: (Accessed: 27 October 2010).

IUCN. 2017. The IUCN Red List of Threatened Species. Version 2017-1. Available at: (Accessed: 27 April 2017).

Kulbicki, M. and Williams, J.T. 1997. Checklist of the shorefishes of Ouvea Atoll, New Caledonia. Atoll Research Bulletin 444: 26.

Lovell, E., Sykes, H., Deiye, M., Wantiez, L., Garrigue, C., Virly, S., Samuelu, J., Solofa, A., Poulasi, T., Pakoa, K., Sabetian, A., Afzal, D., Hughes, A. and Sulu, R. 2004. Status of coral reefs in the southwest Pacific: Fiji, Nauru, New Caledonia, Samoa, Solomon Islands, Tuvalu and Vanuatu. In: C. Wilkinson (ed.), Status of the coral reefs of the world: 2004, pp. 337-362. Australian Institute of Marine Science, Townsville, Queensland, Australia.

Randall, J.E. and McCosker, J.E. 1992. Revision of the fish genus Luzonichthys (Perciformes: Serranidae: Anthiinae), with descriptions of two new species. Indo-Pacific Fishes 21: 21.

Wilkinson, C. 2004. Status of coral reefs of the world: 2004. Australian Institute of Marine Science, Townsville, Queensland, Australia.

Wood, L.J. 2007. MPA Global: A Database of the World's Marine Protected Areas. Available at:

Wu, H.L., Shao, K.T. and Lai, C.F. 1999. Latin-Chinese dictionary of fishes names. The Sueichan Press, Taiwan.

Citation: Allen, G.R. & Sadovy, Y.J. 2010. Luzonichthys williamsi (errata version published in 2017). The IUCN Red List of Threatened Species 2010: e.T154730A115228234. . Downloaded on 24 June 2018.
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