Biology:African arowana

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Short description: Species of ray-finned fish

African arowana
Heterotis niloticus.jpg
Scientific classification edit
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Osteoglossiformes
Family: Osteoglossidae
Subfamily: Arapaiminae
Genus: Heterotis
Rüppell, 1828
Species:
H. niloticus
Binomial name
Heterotis niloticus
(G. Cuvier, 1829)
Synonyms

Genus

  • Clupisudis Swainson, 1839
  • Helicobranchus Hyrtl, 1854

Species

  • Clupisudis niloticus (G. Cuvier, 1829)
  • Sudis nilotica G. Cuvier, 1829
  • Sudis adansonii G. Cuvier, 1829
  • Heterotis adansonii (G. Cuvier, 1829)
  • Sudis niloticus Rüppell, 1829 (ambiguous)
  • Heterotis adansoni Valenciennes, 1847
  • Heterotis ehrenbergii Valenciennes, 1847
Heterotis niloticus - MHNT

The African arowana or Nile arowana (Heterotis niloticus) is a species of bonytongue. Despite being called an "arowana", the African arowana is more closely related to arapaimas, the only other members in the subfamily Arapaiminae, than the South American, Asian, and Australian arowanas in the subfamily Osteoglossinae (Arapaiminae is sometimes considered to be a separate family from Osteoglossidae).[2][3] Compared to these, the African arowana has a more terminal mouth and is the only one that feeds extensively on plankton.[4]

Description

The African arowana is a long-bodied fish with large scales, long dorsal and anal fins set far back on the body, and a rounded caudal fin. Its height is 3.5 to 5.0 times standard length. It has been reported to reach up to 1 m (3.3 ft) long and weigh up to 10.2 kg (22 lb).[4]

This fish is gray, brown, or bronze in color. Coloration is uniform in adults, but juveniles often have dark longitudinal bands.

African arowanas have air-breathing organs on its branchiae, enabling them to survive in oxygen-depleted water. A suprabranchial organ allows it to concentrate small planktonic food particles and also has a sensory function.

Range

This species is widespread throughout Africa, where it is native to all the watersheds in Sahelo-Sudanese region, Senegal, and Gambia, as well as parts of eastern Africa. This range includes the basins of the Corubal, Volta, Ouémé, Niger, Bénoué, and Nile Rivers, as well as those of Lake Chad and Lake Turkana. It has been successfully introduced to Côte d'Ivoire, the Cross River in Nigeria, the Sanaga and Nyong Rivers in Cameroon, and the Ogooué River in Gabon, as well as the lower and middle Congo River basin, including Ubangui and Kasaï Rivers. It has also been introduced in Madagascar . In some cases, introduction is reported to have had a negative impact on the local ecology.[4]

Human use

African arowana is used locally as a food fish and has been collected in the past for the aquarium trade. It is not aggressive like its relatives.[5] It is aquacultured in its native range, being a very successful culture due to its tolerance for crowding and ease of feeding.[6]

References

  1. Diouf, K.; Akinyi, E.; Azeroual, A.; Entsua-Mensah, M.; Getahun, A.; Lalèyè, P.; Moelants, T. (2020). "Heterotis niloticus". IUCN Red List of Threatened Species 2020: e.T182580A134764025. doi:10.2305/IUCN.UK.2020-2.RLTS.T182580A134764025.en. https://www.iucnredlist.org/species/182580/134764025. Retrieved 18 November 2021. 
  2. Froese, Rainer, and Daniel Pauly, eds. (2021). "Osteoglossidae" in FishBase. July 2021 version.
  3. Hilton, E. J.; Lavoué, S. (2018). "A review of the systematic biology of fossil and living bony-tongue fishes, Osteoglossomorpha (Actinopterygii: Teleostei)". Neotropical Ichthyology 16 (3). doi:10.1590/1982-0224-20180031. 
  4. 4.0 4.1 4.2 Froese, Rainer and Pauly, Daniel, eds. (2014). "Heterotis niloticus" in FishBase. July 2014 version.
  5. Nanconnection (2003) (in thai). (แอบ)คุยเรื่องปลาตู้ โครงการ 2 : ปลาอโรตัวเป็นวาน่าเลี้ยง. Bangkok: SE-ED Book Center. ISBN 9789745348653. 
  6. "Aquaculture of Heterotis niloticus in Sub-Saharan Africa: Potentials and Perspectives". Genetics and Biodiversity Journal. doi:10.46325/gabj.v6i1.195. https://www.researchgate.net/publication/358922540_Aquaculture_of_Heterotis_niloticus_in_Sub-Saharan_Africa_Potentials_and_Perspectives. Retrieved 6 December 2022. 

External links

Wikidata ☰ {{{from}}} entry