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Scleropages formosus (Müller & Schlegel, 1840)

Asian bonytongue
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Scleropages formosus
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Indonesia country information

Common names: Arwana, Asian bonytongue, Ikan siluk
Occurrence: native
Salinity: freshwater
Abundance: | Ref:
Importance: commercial | Ref:
Aquaculture: commercial | Ref: Kottelat, M. and E. Widjanarti, 2005
Regulations: protected | Ref: Kottelat, M. and T. Whitten, 1996
Uses: live export: yes;
Comments: Known from Sumatra and Borneo (Ref. 36654). Recorded from Danau Sentarum National Park (Ref. 56749). Museum: Kapuas, MZB 3010 (Ref. 2091). Protected by Indonesian law (Ref. 12217) and CITES I and II. This has been bred in captivity by several companies in Pontianak and Indonesia has been allowed to export a given number of captive bred individuals per year. As a result of this captive breeding, juveniles are the most exported commodity which coincided with a change of trade practices in the Kapuas Lakes area. In 1995, fishermen reported that adults were released and juveniles were grown, occasionally obtained from the mouthbrooding parent. This indicates that a part of the juveniles exported as captive bred originate from the wild (Ref. 56749). The species exhibit several colors: red, gold, pink and green; and the market price very much depend on the color with red being the most expensive and green the cheapest (Godi [ggodi@writeme.com], pers. comm.). Also Ref. 4835.
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/id.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Kottelat, M., A.J. Whitten, S.N. Kartikasari and S. Wirjoatmodjo, 1993
National Database:

Common names from other countries

Classificatie / Names Lokale namen | Synoniemen | Catalog of Fishes(Genus, Soort(en)) | ITIS | CoL | WoRMS | Cloffa

> Osteoglossiformes (Bony tongues) > Osteoglossidae (Arowanas)
Etymology: Scleropages: Greek, skleros = hard + Greek, page, -es = knot (Ref. 45335).
  More on authors: Müller & Schlegel.

Environment: milieu / climate zone / depth range / distribution range Ecologie

; zoet water benthopelagisch.   Tropical; 24°C - 30°C (Ref. 2060)

Verspreiding Landen | FAO regio's | Ecosystemen | Voorkomen | Point map | Introducties | Faunafri

Asia: Southern Myanmar to Malay Peninsula and Indonesia, eastern Thailand to Cardamon Range.

Lengte bij maturiteit / Grootte / Gewicht / Leeftijd

Maturity: Lm ?  range ? - ? cm
Max length : 90.0 cm TL mannelijk / geslacht onbekend; (Ref. 6398)

Korte beschrijving Determinatiesleutels | Morfologie | Morfometrie

With 1 pair of barbels; scales large.

Biologie     Verklarende woordenlijst (bv. epibenthic)

Occurs in tannin stained blackwater streams (Ref. 12693). Found in forest covered streams including peat adjacent areas. Take around three months for free swimming fries (Ref. 57235). Young individuals feed on insects at the water surface, adults take fishes (Ref. 12693, 57235) and smaller vertebrates (Ref. 56749). A mouth brooder, young about 6 cm at birth (Ref. 7050, 57235). Valued as an aquarium fish, its flesh commands a moderate price.

Levenscyclus en paargedrag Maturities | Voortplanting | Spawnings | Egg(s) | Fecundities | Larven

From an observation of a breeding pair in a concrete tank, courtship lasts from several weeks to months. During this stage, the breeding pair swims near the water surface usually at night. "The male chases the female around the perimeter of the tank. Sometimes, the pair circle each other nose-to-tail. About one to two weeks before spawning takes place, the fish swim side by side with their bodies touching. Eventually, the female releases a cluster of orange-red eggs. The male fertilises the eggs and then scoops them into its mouth where it incubates them. After hatching which occurs in about a week, the young larvae continue to live in the male's mouth for 7-8 weeks more until the yolk sac is totally absorbed" (Ref. 57886).

Hoofdreferentie Upload your references | Referenties | Coördinator | Medewerkers

Kottelat, M., 2013. The fishes of the inland waters of Southeast Asia: a catalogue and core bibliography of the fishes known to occur in freshwaters, mangroves and estuaries. The Raffles Bulletin of Zoology 2013 (Suppl. 27):1-663. (Ref. 94476)

Status op de Rode Lijst van het IUCN (Ref. 130435)

  Bedreigd (EN) (A2cd+4cd); Date assessed: 03 June 2019

CITES (Ref. 128078)


CMS (Ref. 116361)

Not Evaluated

Gevaar voor de mens

  Harmless




Gebruik door de mens

Visserij: commercieel; Aquarium: van groot commercieel belang
FAO(visserij: productie; publication : search) | FishSource |

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Estimates based on models

Fylogenetische diversiteitsindex (Ref. 82804):  PD50 = 0.5781   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00417 (0.00172 - 0.01010), b=3.10 (2.89 - 3.31), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trofisch niveau (Ref. 69278):  3.9   ±0.63 se; based on food items.
Weerstandsvermogen (Ref. 120179):  laag, minimale populatieverdubbelingstijd 4,5-14 jaar (tm = 3-4; Fec = 50 (in concrete tanks)).
Fishing Vulnerability (Ref. 59153):  High vulnerability (56 of 100).
Prijsklasse (Ref. 80766):   Unknown.