|Scientific Name:||Scleropages formosus|
|Species Authority:||(Müller & Schlegel, 1844)|
|Taxonomic Notes:||Until 2003, all Scleropages from southeast Asia were considered to belong to the same species; S. formosus. In 2003 Pouyaud et al., considered there to actually be four species, three of which they described as new (S. aureus, S. legendrei, S. macrocephalus). Kottelat and Widjanarti (2005) reviewed the published data and did not reach the same conclusions from the quality of the data presented, and in order for more than one species to be recognised, a professional standard study would need to be presented.|
|Red List Category & Criteria:||Endangered A4cd ver 3.1|
|Reviewer/s:||Juffe Bignoli, D. & Vidthayanon, C.|
The population of this species is at very low densities throughout its range following significant declines in the past. This has been a highly valued species in the international aquarium trade since the 1970s and has been listed on Appendix I of CITES since 1975. There are a number of registered CITES breeders in Asia and the specimens they produce can be imported into several nations. Other nations restrict or prohibit possession of this species. Illegal trade does occur. Habitat degradation throughout the species' range, caused by a variety of human activities, is now its main threat. For example, a number of swamp habitats have been transformed into agricultural land. Areas of forested habitat have been logged and transformed into plantations. Forest fires have impacted most of the species range in Indonesia, especially peat swamp forests. This species is assessed as Endangered based on a decline in area of occupancy, extent of occurrence and habitat quality, and levels of exploitation.
Further taxonomic study is required to confirm the taxonomic status of populations of the species across its range.
|Range Description:||This species occurs in the Mekong basin in Viet Nam and Cambodia, southeastern Thailand, Tenassarim (Myanmar), the Malay Peninsula from Sungai Golok southwards, Borneo, Sumatra. This species was also introduced to Singapore (Blanc and D'Aubenton 1965, Kottelat et al. 1993, Kottelat and Lim 1995, Rainboth 1996).|
Native:Cambodia; Indonesia (Kalimantan, Sumatera); Malaysia (Peninsular Malaysia, Sarawak); Myanmar; Thailand; Viet Nam
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||The population of this species is at very low density throughout its range following significant declines in the past of well over 50% (M. Kottelat pers. comm. 2011). Populations are currently decreasing.|
|Habitat and Ecology:||This is a fairly large mouthbrooding fish which lives in lakes, deep parts of swamps, flooded forests and stretches of deep rivers with slow currents and dense, overhanging vegetation (M. Kottelat pers. comm. 2011).|
This species has been targeted for the aquarium trade since the 1970s, which has impacted populations. Now trade is regulated, but enforcement is not optimal and there is still pressure on some of the wild populations (the most colourful ones). It is also caught incidentally in local fisheries.
Habitat degradation throughout the species range caused by a variety of human activities is now its main threat. For example, a number of swamp habitats have been transformed into agricultural land. Areas of forested habitat have been logged and transformed into plantations. Forest fires have impacted most of the species range in Indonesia, especially peat swamp forests (M. Kottelat pers. comm. 2011).
|Conservation Actions:||This species has been listed on Appendix I of CITES since 1975. Parts of the species range is within protected areas. These are mostly swamps and lakes but aquatic biodiversity is not really considered.|
Blanc, M. and D'Aubenton, F. 1965. Sur la presence de Scleropages formosus (Müller et Schlegel 1844), poisson de la famille des Osteoglossidae dans les eaux douces du Cambodge. Bulletin of the Museum of Natural History 37(3): 397-402.
IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: http://www.iucnredlist.org. (Accessed: 16 June 2011).
Kottelat, M. and Lim, K.K.P. 1995. Freshwater fishes of Sarawak and Brunei Darussalam: a preliminary annotated checklist. Sarawak Museum Journal 48: 227-258.
Kottelat, M. and Widjanarti, E. 2005. The fishes of Danau Sentarum National Park and the Kapuas Lakes area, Kalimantan Barat, Indonesia. Raffles Bull. Zool. Supplement 13: 139-173.
Kottelat, M. & K. K. P. Lim. 1994. Diagnoses of two new genera and three new species of earthworm eels from the Malay Peninsula and Borneo (Teleostei: Chaudhuriidae). Ichthyological Exploration of Freshwaters 5(2): 181–190.
Kottelat, M., Whitten, A.J., Kartikasari, S.N. and Wirjoatmodjo, S. 1993. Freshwater fishes of Western Indonesia and Sulawesi. Periplus Editions, Hong Kong.
Pouyaud, L., Sudarto & G. G. Teugels. 2003. The different colour varieties of the Asian arowana Scleropages formosus (Osteoglossidae) are distinct species: morphologic and genetic evidences. Cybium 27(4): 287–305.
Rainboth, W.J. 1996. Fishes of the Cambodian Mekong.
|Citation:||Kottelat, M. 2011. Scleropages formosus. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 08 December 2013.|
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