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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: Castelnau.
Environment: milieu / climate zone / depth range / distribution range
Ecologie
; zoet water; brak water demersaal; potamodroom (Ref. 51243). Tropical; 11°S - 27°S
Africa: Quanza, Cunene, Okavango, Chobe, Lake Ngami, upper Zambezi (above Victoria Falls), Kafue, Lake Malawi, upper Lualaba, Luapula, Lakes Moero and Bangweulu, Pungwe, Buzi, Save, Limpopo, Incomati, lower Pongolo and lower Sabi/Lundi system (Ref. 248). Also reported from the lower Shire (Ref. 7248, 52193)
Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - ? cm
Max length : 73.0 cm TL mannelijk / geslacht onbekend; (Ref. 52193); max. gepubliceerd gewicht: 4.0 kg (Ref. 52193)
Dorsale stekels (totaal) : 0; Dorsale zachte stralen (totaal) : 56 - 62; Anale stekels: 0; Anale zachte stralen: 50 - 58; Wervels: 56 - 60. Diagnosis: Characterized by a relatively long vomerine tooth plate (5.9-14.4% of head length) and by a relatively short adipose fin (5.9-12.5% of standard length), the length of which is a specific character of Clarias ngamensis; head oval to rectangular in dorsal outline; frontal fontanelle long and narrow (`knife-shaped'); occipital fontanelle small and oval-shaped; pectoral spine robust and slightly curved; the suprabranchial organ consists of well developed arborescent structures (Ref. 248). It is distinguished from Clarias gariepinus by having a short adipose fin behind the rayed dorsal and an ovoid vomerine toothplate with granular or blunt teeth (Ref. 52193).
Facultative air-breathing (Ref. 126274); The species seems to be nowhere especially abundant but is fairly common in some areas such as weed beds, permanent swamps, quieter waters and muddy bottoms (Ref. 248, 5595). Prefers vegetated habitats. Feeding habits overlap considerably with the sharptooth catfish. Important foods are mollusks, terrestrial and aquatic insects, insect larvae, shrimps, grain, crabs and fish (Ref. 4967, 78218). Feeds on snails (Ref. 5595). Hard-shelled foods such as mussels are crushed before they are swallowed. Breeds during the summer rainy season. May live for 5-6 years (Ref. 7248). Also caught with drawnets (Ref. 4967).
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
Breeding is reportedly flood dependent and similar to that of C. gariepinus.
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: Version 2024-2)
Gevaar voor de mens
Harmless
Gebruik door de mens
Visserij: commercieel; Aquacultuur: commercieel; sportvis: ja; Aquarium: Commercieel
Tools
Speciale rapporten
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Estimates based on models
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00776 (0.00396 - 0.01521), b=2.98 (2.82 - 3.14), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245).
Trofisch niveau (Ref.
69278): 4.3 ±0.5 se; based on diet studies.
Weerstandsvermogen (Ref.
120179): Gemiddeld, minimale populatieverdubbelingstijd 1,4-4,4 jaar (K=0.22-0.41).
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (36 of 100).
Nutrients (Ref.
124155): Calcium = 29.1 [14.5, 133.1] mg/100g; Iron = 1.04 [0.62, 1.87] mg/100g; Protein = 17.2 [16.1, 18.2] %; Omega3 = 0.137 [0.066, 0.309] g/100g; Selenium = 90.7 [37.8, 217.9] μg/100g; VitaminA = 15.2 [5.6, 41.2] μg/100g; Zinc = 0.547 [0.403, 0.741] mg/100g (wet weight);
