Your internet guide to
all things catfish









Back to Family page Back to Family page


Olivaichthys viedmensis (MacDonagh, 1931)

Image contributors to this species:

Karl-Heinz Dau (1 Stamp)

ScotCat Sources:

Etymology = Genus 

Other Sources:

Fishbase  Google Search  All Catfish Species Inventory

Relevant Information:

Dorsal spines (total): 2; Dorsal soft rays (total): 6 - 6; Anal spines: 4 - 5; Anal soft rays: 8 - 11; Vertebrae: 41 - 43. Six species of Diplomystidae are currently recognized (Arratia, 1987; Azpelicueta, 1994a-b). Berra (2001) depicts the family distribution. Half of the species occur west of the Andes in south central Chile. The trans-Andean species are D. chilensis from rivers near Valparaíso and Santiago, D. nahuelbutaensis from the Bío Bío basin, and D. camposensis from the Valdivia region (Arratia, 1987). Three other species occur east of the Andes in southern Argentina. Arratia (1987) erected the genus Olivaichthys for the Argentinian specimens and Lundberg, et al (2004) follow Azpelicueta (1994a-b) and most subsequent authors who treat Olivaichthys as a synonym of Diplomystes. The cis-Andean species are O. viedmensis from the Río Negro system, O. cuyanus from the Río Colorado and the Desaguadero-Salado basin, and O. mesembrinus known only from relatively few specimens from Chubut and Senguerr rivers (Azpelicueta, 1994a-b). Olivaichthys viedmensis has been taken from rivers near sea level to about 1,900 m (Azpelicueta, 1994a). Diplomystids are generalized carnivores that consume annelids, mollusks, and arthropods (Arratia, 1987; Azpelicueta & Gosztonyi, 1998). Note: Fishbase and the All Catfish Species Inventory go with Arratia (1987) and name this species as Olivaichthys viedmensis.

 Common Name:



Diplomystes viedmensis




South America: Negro River and tributaries in Argentina. Type locality: Río Negro, Argentina, frente a Viedma.


32.5cm. (13ins)


20-24°C (67-75°f.)


6.0 -7.0.


Lundberg, J.G., T.M. Berra and J.P. Friel 2004 First description of small juveniles of the primitive catfish Diplomystes (Siluriformes: Diplomystidae). Ichthyol. Explor. Freshwat. 15(1): 71-82.
Froese, R. and D. Pauly. Editors. 2009.FishBase. World Wide Web electronic publication. www.fishbase.org, version (09/2010).



Back to Family Back to Family page Back to Family Back to Family page































































































                                                                                                 updated = September 20, 2018 © ScotCat 1997-2018