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Siluriformes (Catfishes) >
Clariidae (Airbreathing catfishes)
Etymology: Gymnallabes: Greek, gymnos = hidden + Greek, allabes, -etos = a fish of the Nile, a kind of lamprey (Ref. 45335).
More on author: Günther.
Ambiente: milieu / zona climatica / distribuzione batimetrica / gamma di distribuzione
Ecologia
; acqua dolce demersale. Tropical; 17°N - 2°N
Africa: lower reaches and the delta of the Niger (Nigeria) and the Cross basin (Nigeria and Cameroon)(Ref. 57129, 81644). Also reported from the rivers Ouémé (Benin) (Ref. 57129, 81644) and Osse (Nigeria)(Ref. 57129).
Dimensione / Peso / Età
Maturità: Lm ? range ? - ? cm
Max length : 29.7 cm TL maschio/sesso non determinato; (Ref. 81644)
Spine dorsali (totale) : 0; Raggi dorsali molli (totale) : 96 - 109; Spine anali: 0; Raggi anali molli: 83 - 94. Diagnosis: dorsal and anal fins always confluent with caudal fin (Ref. 57129, 81644). Body very elongate, maximum body depth 14-15% standard length (Ref. 57129), abdominal depth 4.5-8% SL (mean 6) (Ref. 81644). Head very short, 12.5-14.3% standard length; lateral cephalic bones separated from each other by a distinct gap (Ref. 57129). Distance between supraoccipital process and dorsal fin short, 5-14% SL; pectoral fins present, 30-56% skull length, supported by a short spine (about half of fin length); pelvic fins always present and short; skull short, 11-18% SL (mean 13), with a very narrow roof, 9-23% (mean 14) head length, partially covered by jaw muscles; these muscles almost completely exposed dorsally and laterally and frequently bulging (especially in larger specimens); supraoccipital process short and narrow, 10-20% (mean 16) head length; eyes very small (4-9%), bordered by small infraorbital bones (hard to observe externally); barbels long, maxillary longest (86-155% skull
length); maxillary barbel connected at base to large skin folds that border mouth opening; when mouth is closed, these skin flaps are folded and conspicuous in dorsal view; internal mandibular barbel shortest, 58-99% (mean 76) head length (Ref. 81644).
Coloration: in life: uniformly light brown (Ref. 81644). Preserved specimens: brownish-black on back and sides, light brown on belly (Ref. 57129). Ventral prepelvic region slightly paler than rest of body (Ref. 81644).
Body shape (shape guide): eel-like.
Prefers small streams and ditches with leaf litter. Also found in swamp regions. Diet probably consists of insect larvae, worms and similar smaller organisms. Fishes are not eaten (Ref. 78218).
Ciclo vitale e comportamento di accoppiamento
Maturità | Riproduzione | Deposizione | Uova | Fecondità | Larve
Teugels, G.G., 2003. Clariidae. p. 144-173 In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux douce et saumâtres de l'Afrique de l'Ouest, Tome 2. Coll. Faune et Flore tropicales 40. Musée Royal de l'Afrique Centrale, Tervuren, Belgique, Museum National d'Histoire Naturalle, Paris, France and Institut de Recherche pour le Développement, Paris, France. 815 p. (Ref. 57129)
Stato della Lista Rossa IUCN (Ref. 130435: Version 2025-2 (Global))
Minaccia per l'uomo
Harmless
Usi umani
Strumenti
Rapporti speciali
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Fonti Internet
Stime basate su modelli
Indice di diversità filogenetica (Fonte Biblio.
82804): PD
50 = 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00102 (0.00046 - 0.00225), b=3.06 (2.88 - 3.24), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
Livello trofico (Fonte Biblio.
69278): 3.4 ±0.6 se; based on size and trophs of closest relatives
Resilienza (Fonte Biblio.
120179): Alto, tempo minimo di raddoppiamento della popolazione meno di 15 mesi (Preliminary K or Fecundity.).
Vulnerabilità della pesca (Ref.
59153): Low vulnerability (20 of 100).
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