Chaetodontoplus vanderloosi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Perciformes Pomacanthidae

Scientific Name: Chaetodontoplus vanderloosi Allen & Steene, 2004

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(v)+2ab(v) ver 3.1
Year Published: 2010
Date Assessed: 2009-10-08
Assessor(s): Allen, G.
Reviewer(s): Elfes, C., Polidoro, B., Livingstone, S. & Carpenter, K.E.

This species has one of the smallest geographic distributions of any coral reef fish in the Indo-West Pacific. The extent of occurrence in approximately 275 km2, and the estimated area of occupancy is 15 km2. The total population is estimated at less than 1,500 individuals. The species is threatened by changes in the pattern of cool-water upwelling that characterizes its habitat. Climate-associated changes in ocean circulation and temperature within this species' limited habitat may be a significant threat to the population. There have been observed declines in the number of adult individuals over the past 25 years (G. Allen pers. comm. 2010). It does not occur within marine protected areas. In view of this species' limited distribution, small population and decline in numbers, it is listed as Endangered.

Geographic Range [top]

Range Description:This species has one of the smallest ranges of all Indo-Pacific coral reef fishes, approximately 275 km2, extending between Samarai Island (10o36.50'S, 150o39.64'E) and the southeastern corner of Basilaki Island (10o39.68S, 151o04.50'E) in Milne Bay Province of Papua New Guinea. The estimated area of occupancy within this habitat is 15 km2.
Countries occurrence:
Papua New Guinea
FAO Marine Fishing Areas:
Pacific – western central
Additional data:
Estimated area of occupancy (AOO) - km2:15
Number of Locations:1
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The total population is thought to be less than 1,500 individuals. Over the past 25 years, a definite decline in population numbers has been observed (G. Allen pers. comm. 2010).
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:1500
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species is confined to a very limited area. Despite extensive searching in other parts of Milne Bay Province (which includes approximately 265,000 km2 of ocean) during five visits, it was only seen in a small area. The species is apparently associated with relatively cool temperatures. Allen (1998) reported the occurrence of exceptionally low water temperatures in this area, between 22-24 oC, compared to 26-28 oC in other parts of Milne Bay Province. Perhaps strong currents that sweep southward through narrow passes between islands cause displacement of surface waters and consequent upwelling of colder waters from below.

Threats [top]

Major Threat(s): The threats to this species are not well understood. The species is clearly dependent on a pattern of cool-water upwelling from depth. Climate-associated changes in ocean circulation and increasing temperatures may be associated with the observed decrease in population numbers.

Conservation Actions [top]

Conservation Actions: This species is not found within any protected areas.

Citation: Allen, G. 2010. Chaetodontoplus vanderloosi. The IUCN Red List of Threatened Species 2010: e.T169676A6666175. . Downloaded on 16 October 2018.
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