Namibia country information

Common names: Smoothhead catfish
Occurrence: native
Salinity: freshwater
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Known from Okavango, Upper Zambezi, Kwando, Chobe, and Kunene.
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/wa.html
National Fisheries Authority: http://www.benefit.org.na/
Occurrences: Occurrences Point map
Main Ref: Hay, C.J., B.J. van Zyl, F.H. van der Bank, J.T. Ferreira and G.J. Steyn, 1999
National Database:

Common names from other countries

Isombe, Mokkakonnamonni, 裸头胡鲶, ... more

Classificatie / Names Lokale namen | Synoniemen | Catalog of Fishes(Genus, Soort(en)) | ITIS | CoL | WoRMS | Cloffa

> Siluriformes (Catfishes) > Clariidae (Airbreathing catfishes)
Etymology: Clarias: Greek, chlaros = lively, in reference to the ability of the fish to live for a long time out of water.
More on author: Boulenger.

Environment: milieu / climate zone / depth range / distribution range Ecologie

; zoet water demersaal. Tropical; 22°C - 28°C (Ref. 12468); 2°N - 12°S

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Africa: Lake Victoria, Edward, George, small lakes of Uganda, Lake Kivu, smaller lakes of Rwanda, Lake Tanganyika, in Malawi, Kagera, Malagarazi and Ruzizi Rivers (Ref. 248). Also in Lake Rukwa (Ref. 27292) and in Luapula and Lualaba River drainages (Congo River basin) (Ref. 248). Present in Cunene, Okavango, upper Zambezi, and Kafue systems (Ref. 7248).

Grootte / Gewicht / Leeftijd

Maturity: L_m ? range ? - ? cm
Max length : 32.0 cm TL mannelijk / geslacht onbekend; (Ref. 3820)

Korte beschrijving Determinatiesleutels | Morfologie | Morfometrie

Dorsale stekels (totaal) : 0; Dorsale zachte stralen (totaal) : 67 - 79; Anale zachte stralen: 53 - 67; Wervels: 55 - 58. Pectoral fin spine with serrations on the inner and upward directed on the outer side (Ref. 34290). Head oval to rectangular dorsally; snout broadly rounded; eyes more laterally located. Frontal fontanelle intermediate between `knife-shaped' and `sole-shaped'; occipital fontanelle long and oval-shaped. Supraorbital and `dermosphenotic' bones generally joined above 150 mm SL and more dorsally placed. Tooth plates relatively broad. Pectoral spine relatively short; its outer side strongly serrated over entire length. Gill rakers short and far apart. Openings of secondary sensory canals regularly arranged on flanks.

Facultative air-breathing (Ref. 126274); Occurs in marginal water-lily and papyrus swamps as well as in marginal weed beds; abundant in high mountain streams and torrents and on the bottom among stones; not found in any situation lower than about 915 m above sea level nor in water of a higher temperature than 18 °C (Ref. 248). In the Rukwa and Malawi drainage they are sometimes found in very cold upland streams (Ref. 78218). These fishes are omnivores, feeding on insect larvae and sometimes also fishes (Ref. 78218).

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Teugels, G.G., 1986. A systematic revision of the African species of the genus Clarias (Pisces; Clariidae). Ann. Mus. R. Afr. Centr., Sci. Zool., 247:199 p. (Ref. 248)

Status op de Rode Lijst van het IUCN (Ref. 130435)

Niet bedreigd (LC) ; Date assessed: 18 July 2018

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaar voor de mens

Harmless

Gebruik door de mens

Visserij: commercieel

FAO(Publication : search) | FishSource |

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Estimates based on models

Fylogenetische diversiteitsindex (Ref. 82804): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00776 (0.00343 - 0.01757), b=2.97 (2.79 - 3.15), in cm Total Length, based on LWR estimates for this Genus-body shape (Ref. 93245).

Trofisch niveau (Ref. 69278): 3.3 ±0.45 se; based on food items.

Weerstandsvermogen (Ref. 120179): Hoog, minimale populatieverdubbelingstijd minder dan 15 maanden (Preliminary K or Fecundity.).

Fishing Vulnerability (Ref. 59153): Low vulnerability (22 of 100).

Prijsklasse (Ref. 80766): Unknown.

Clarias liocephalus Boulenger, 1898