Nematogenys inermis (Guichenot, 1848)

Image contributors to this species:

Iván Valdebenito Isler (2) Original source (1)

ScotCat Sources:

Etymology = Genus 

Other Sources:

Fishbase  Google Search  All Catfish Species Inventory 

Relevant Information:

Contains only this single genus, Nematogenys, which contains a single species, N. inermis. The genus is endemic to some rivers in Chile. The common name for this species is "Mountain Catfish". Previously in the Trichomycteridae family and is very rare in the aquatic hobby. There was a fossil which was found and described from the Miocene, continental fluviolacustrine deposits of the upper Cura–Mallín Formation (37–39°S), Chile (Azpelicueta & Rubilar, 1997). This species was named as Nematogenys cuivi. Remarks: N. inermis has no adipose fin and and the caudal fin is short and rounded. There is not much information on keeping this species in the aquarium.

Common Name:

Mountain Catfish


Trichomycterus inermis, Nematogenys nigricans, Nematogenys pallidus




South America: Isolated localities in Concepción, Rancagua and Angol, Chile. Formerly widespread throughout much of Central Chile. Type locality: Chile.


24cm (9¾ins)


18-24°C (63-75°F)




de Pínna, M.C.C., 2003. Nematogenyidae (mountain catfishes). p. 268-269. 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.
Froese, R. and D. Pauly. Editors. 2017.FishBase. World Wide Web electronic publication., ( 02/2017 )
Ferraris, C.J. Jr., 2007. Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa 1418:1-628.
Burgess, W.E. 1989 An atlas of freshwater and marine catfishes. A preliminary survey of the Siluriformes. T.F.H. Publications, Inc., Neptune City, New Jersey (USA). 784 p.

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