Heterotis_niloticus

African arowana

African arowana

Species of ray-finned fish

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]

Quick Facts Conservation status, Scientific classification ...
Heterotis niloticus - MHNT

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. [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. Retrieved 18 November 2021.
  2. [2]
    Froese, Rainer, and Daniel Pauly, eds. (2021). "Osteoglossidae" in FishBase. July 2021 version.
  3. [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]
    Froese, Rainer; Pauly, Daniel (eds.) (2014). "Heterotis niloticus" in FishBase. July 2014 version.
  5. [5]
    Nanconnection (2003). (แอบ)คุยเรื่องปลาตู้ โครงการ 2 : ปลาอโรตัวเป็นวาน่าเลี้ยง [(Secretly) talk about the aquarium fish. Project 2: Aro fish is a Wana] (in Thai). Bangkok: SE-ED Book Center. ISBN 9789745348653.
  6. [6]
    Wikondi, Jeanne; Tonfack, Djouatsa Juvenal; Meutchieye, Félix; Tomedi, Tabi Minette (2022). "Aquaculture of Heterotis niloticus in Sub-Saharan Africa: Potentials and Perspectives". Genetics and Biodiversity Journal. 6: 37–44. doi:10.46325/gabj.v6i1.195. Retrieved 6 December 2022.
Share this article:

This article uses material from the Wikipedia article Heterotis_niloticus, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.