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Fish Identification: Find Species

Class: Actinopterygii
Order: Gymnotiformes
Family: Gymnotidae Naked-back knifefishes

Genus: Gymnotus

(See list of species below)



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40 species in
(see list below)
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South America
Max. Length 30 cm SL
Gymnotus anguillaris Hoedeman, 1962

Photo by Photo by Holm, E.
 
Gymnotus anguillaris
[]
No picture found

Max. Length 55 cm TL

 
Gymnotus arapaima
[]
No picture found


 
Gymnotus ardilai
[]
No picture found

Max. Length 27.6 cm TL

 
Gymnotus bahianus
[]
No picture found

Max. Length 17.9 cm TL

 
Gymnotus capanema
[]
No picture found

Max. Length 15.8 cm TL

 
Gymnotus capitimaculatus
[]



Central and South America
Max. Length 76 cm TL
Gymnotus carapo Linnaeus, 1758

Photo by Photo by Landines, M.
 
Gymnotus carapo
[Banded knifefish]



South America
Max. Length 31.6 cm TL
Gymnotus cataniapo Mago-Leccia, 1994

Photo by Photo by JJPhoto
 
Gymnotus cataniapo
[]
No picture found

Max. Length 27.5 cm SL

 
Gymnotus chaviro
[]
No picture found

Max. Length 24.3 cm TL

 
Gymnotus chimarrao
[]
No picture found

Max. Length 26 cm TL

 
Gymnotus choco
[]
No picture found

Max. Length 30 cm TL

 
Gymnotus coatesi
[]
No picture found

Max. Length 34.5 cm SL

 
Gymnotus coropinae
[]
No picture found

Max. Length 30.5 cm TL

 
Gymnotus cuia
[]
No picture found

Max. Length 23.5 cm TL

 
Gymnotus curupira
[]



Central America

Gymnotus cylindricus La Monte, 1935

Photo by Photo by Molina, A.
 
Gymnotus cylindricus
[]
No picture found

Max. Length 12.5 cm TL

 
Gymnotus diamantinensis
[]
No picture found

Max. Length 30.9 cm TL

 
Gymnotus esmeraldas
[]
No picture found

Max. Length 31.2 cm SL

 
Gymnotus henni
[]



South America
Max. Length 99.8 cm TL
Gymnotus inaequilabiatus (Valenciennes, 1839)

Photo by Photo by Equipe de Ictiologia do Nupélia
 
Gymnotus inaequilabiatus
[]
No picture found

Max. Length 12.1 cm TL

 
Gymnotus interruptus
[]
No picture found

Max. Length 20.1 cm TL

 
Gymnotus javari
[]
No picture found

Max. Length 13.5 cm TL

 
Gymnotus jonasi
[]



Central America.

Gymnotus maculosus Albert & Miller, 1995

Photo by Photo by Molina, A.
 
Gymnotus maculosus
[Spotted knifefish]
No picture found

Max. Length 24.3 cm TL

 
Gymnotus mamiraua
[]
No picture found

Max. Length 10 cm TL

 
Gymnotus melanopleura
[]
No picture found

Max. Length 21.5 cm TL

 
Gymnotus obscurus
[]



South America
Max. Length 28.6 cm TL
Gymnotus omarorum Richer-de-Forges, Crampton & Albert, 2009

Photo by Photo by Albert, J.S.
 
Gymnotus omarorum
[]
No picture found

Max. Length 12 cm TL

 
Gymnotus onca
[]
No picture found

Max. Length 23.6 cm TL

 
Gymnotus panamensis
[]



South America
Max. Length 26 cm TL
Gymnotus pantanal Fernandes, Albert, Daniel-Silva, Lopes, Crampton & Almeida-Toledo, 2005

Photo by Photo by Equipe de Ictiologia do Nupélia
 
Gymnotus pantanal
[]



South America
Max. Length 23.6 cm TL
Gymnotus pantherinus (Steindachner, 1908)

Photo by Photo by Sazima, I.
 
Gymnotus pantherinus
[]



South America
Max. Length 24 cm SL
Gymnotus paraguensis Albert & Crampton, 2003

Photo by Photo by Equipe de Ictiologia do Nupélia
 
Gymnotus paraguensis
[]
No picture found

Max. Length 28.1 cm TL

 
Gymnotus pedanopterus
[]
No picture found

Max. Length 14.2 cm TL

 
Gymnotus stenoleucus
[]



South America
Max. Length 42 cm SL
Gymnotus sylvius Albert & Fernandes-Matioli, 1999

Photo by Photo by Sazima, I.
 
Gymnotus sylvius
[]
No picture found

Max. Length 41.1 cm TL

 
Gymnotus tigre
[]



South America
Max. Length 24 cm TL
Gymnotus tiquie Maxime, Lima & Albert, 2011

Photo by Photo by Maxime et al.
 
Gymnotus tiquie
[Tiquie banded knifefish]
No picture found

Max. Length 19 cm TL

 
Gymnotus ucamara
[]
No picture found

Max. Length 28.5 cm TL

 
Gymnotus varzea
[]



40 species

Sort by: Species Length Year
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Scientific Name English Name Distribution Max. Length (cm) Year
Gymnotus anguillaris South America 30 SL 1962
Gymnotus arapaima South America 55 TL 2001
Gymnotus ardilai South America 2004
Gymnotus bahianus South America 27.6 TL 1996
Gymnotus capanema South America 17.9 TL 2012
Gymnotus capitimaculatus South America 15.8 TL 2014
Gymnotus carapo Banded knifefish Central and South America 76 TL 1758
Gymnotus cataniapo South America 31.6 TL 1994
Gymnotus chaviro South America 27.5 SL 2009
Gymnotus chimarrao South America 24.3 TL 2008
Gymnotus choco South America 26 TL 2003
Gymnotus coatesi South America 30 TL 1935
Gymnotus coropinae South America 34.5 SL 1962
Gymnotus cuia South America 30.5 TL 2018
Gymnotus curupira South America 23.5 TL 2005
Gymnotus cylindricus Central America 1935
Gymnotus diamantinensis South America 12.5 TL 2002
Gymnotus esmeraldas South America 30.9 TL 2003
Gymnotus henni South America 31.2 SL 2003
Gymnotus inaequilabiatus South America 99.8 TL 1839
Gymnotus interruptus South America 12.1 TL 2012
Gymnotus javari South America 20.1 TL 2003
Gymnotus jonasi South America 13.5 TL 2001
Gymnotus maculosus Spotted knifefish Central America. 1995
Gymnotus mamiraua South America 24.3 TL 2001
Gymnotus melanopleura South America 10 TL 2001
Gymnotus obscurus South America 21.5 TL 2005
Gymnotus omarorum South America 28.6 TL 2009
Gymnotus onca South America 12 TL 2001
Gymnotus panamensis Central America 23.6 TL 2003
Gymnotus pantanal South America 26 TL 2005
Gymnotus pantherinus South America 23.6 TL 1908
Gymnotus paraguensis South America 24 SL 2003
Gymnotus pedanopterus South America 28.1 TL 1994
Gymnotus stenoleucus South America 14.2 TL 1994
Gymnotus sylvius South America 42 SL 1999
Gymnotus tigre South America 41.1 TL 2003
Gymnotus tiquie Tiquie banded knifefish South America 24 TL 2011
Gymnotus ucamara South America 19 TL 2003
Gymnotus varzea South America 28.5 TL 2005



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cfm script by eagbayani, 30.11.04, ,  php script by cmilitante, 05/11/2010 ,  last modified by cmilitante, 14/03/2013