Overview

Comprehensive Description

Rosen’s Tube Snout Electric Knifefish (Sternarchorhynchus roseni) lives primarily in the deep waters of the main channels of rivers in the Orinoco River system of northern South America. It is a member of the Electric Knifefish family Apteronotidae, which is part of the order Gymnotiformes. The most famous member of this order is the Electric Eel (Electrophorus electricus), which can (as indicated by its name) generate a strong electrical discharge, delivering a potent shock that can stun prey. Although no other member of the order can deliver such shocks, all of them, including Rosen’s Tube Snout Electric Knifefish, generate and receive weak electrical signals. These function in communication using electrical signals (electrocommunication), facilitate information exchange between potential mates, and provide a way to detect other organisms and items in surrounding waters (electroreception). Rosen’s Tube Snout Electric Knifefish uses its electrical sensory system to locate small prey items, usually insects, hiding in mud and in the debris at the bottom of major rivers. It then uses the pincer-like jaws at the end of its long snout to pull the prey from its hiding place and suck it into the mouth.

During certain times of the year, the males of this species produce very well developed teeth at the end of the lower jaw. These teeth are presumably used in confrontations during breeding contests.

de Santana and Vari (2010) provide a technical morphological description and diagnosis.

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© Richard Vari

Source: EOL Rapid Response Team

Trusted

Article rating from 1 person

Average rating: 4.0 of 5

Sternarchorhynchus cf. roseni ZBK .

Brazil : Amazonas : INPA 15822, 6, 223-374, Rio Tefé , Toco Preto, 03°47.31’S , 64°59.91’W , W. G. R. Crampton, 22-25 Out 1999. INPA 17601, 3, 310-326, C. Cox-Fernandes, 07 Jan 1998 . INPA 17602, 1, 370, Rio Purus, Bacia da Ressaca, C. Cox-Fernandes, 20 Oct 1992 . INPA 17603, 2, 337-373, Rio Purus, Bacia da Ressaca, C. Cox-Fernandes, 20 Oct 1992 . INPA 17604, 1, 305, Rio Purus, C. CoxFernandes, 20 Oct 1992 . INPA 17605, 3, 192-279, Costa do Morimba, Careiro, C. CoxFernandes, 07 Jan 1998 . INPA 17606, 1, 243, Rio Amazonas, C. Cox-Fernandes, 14 Nov 1992 . INPA 17607, 1, 238, Rio Solimões , Machantaria, C. Cox-Fernandes, 26 Oct 1992 . INPA 17098, 1, 180, Rio Purus, 4º17’0.1”S , 61º54’9.7”W , L. Py-Daniel, 11 Jun 2001 . UF 146954, 1, 295, Rio Tefé , Toco Preto, 03°47.31’S64°59.91’W , W. G. R. Crampton, 23 Out 1999.

  • Carlos David de Santana, William G. R. Crampton (2006): Sternarchorhynchus curumim (Gymnotiformes: Apteronotidae), a new species of tube-snouted ghost electric knifefish from the lowland Amazon basin, Brazil. Zootaxa 1166, 57-68: 66-66, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:9F94D386-15AE-424A-88C9-4169AB93DB60
Public Domain

MagnoliaPress via Plazi

Source: Plazi.org

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Sternarchorhynchus roseni ZBK .

Venezuela : Apure : CU 72165, 1, 147, Matiyuri River, Orinoco River, just S of village of Achaguas, C. D. Hopkins, 25 May 1989 .

  • Carlos David de Santana, William G. R. Crampton (2006): Sternarchorhynchus curumim (Gymnotiformes: Apteronotidae), a new species of tube-snouted ghost electric knifefish from the lowland Amazon basin, Brazil. Zootaxa 1166, 57-68: 66-66, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:9F94D386-15AE-424A-88C9-4169AB93DB60
Public Domain

MagnoliaPress via Plazi

Source: Plazi.org

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Biology

Specimens collected at Caño Bravo in the Río Apure drainage of Venezuela, from a white water habitat over a substrate of sand and clay covered with leaf litter and at water depths of up to 1.5 m (Ref. 84053).
  • de Santana, C. D. and R.P. Vari 2010 Electric fishes of the genus Sternarchorhynchus (Teleostei, Ostariophysi, Gymnotiformes); phylogenetic and revisionary studies. Zool. J. Linn. Soc. 159:223-371. (Ref. 84053)
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Distribution

South America: Orinoco and Amazon River basins.
  • Albert, J.S. 2003 Apteronotidae (Ghost knifefishes). p. 497-502. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. (Ref. 36886)
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Orinoco and Amazon River basins: Brazil and Venezuela.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© FishWise Professional

Source: FishWise Professional

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Physical Description

Morphology

Dorsal spines (total): 0; Dorsal soft rays (total): 0; Analsoft rays: 187 - 215; Vertebrae: 82 - 84
  • Mago-Leccia, F. 1994 Electric fishes of the continental waters of America. Fundacion para el Desarrollo de las Ciencias Fisicas, Matematicas y Naturales (FUDECI), Biblioteca de la Academia de Ciencias Fisicas. Matematicas y Naturales, Caracas, Venezuela. vol. 29 . 206 p. (Ref. 26457)
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Size

Maximum size: 410 mm TL
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© FishWise Professional

Source: FishWise Professional

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Max. size

41.7 cm TL (male/unsexed; (Ref. 84053))
  • de Santana, C. D. and R.P. Vari 2010 Electric fishes of the genus Sternarchorhynchus (Teleostei, Ostariophysi, Gymnotiformes); phylogenetic and revisionary studies. Zool. J. Linn. Soc. 159:223-371. (Ref. 84053)
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Ecology

Habitat

Environment

benthopelagic; freshwater
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Conservation

Threats

Not Evaluated
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Disclaimer

EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!