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Osteoglossiformes (Bony tongues) >
Mormyridae (Elephantfishes)
Etymology: Petrocephalus: Latin, petra = stone + Greek, kephale = head (Ref. 45335).
Eponymy: Dr Cuthbert Christy (1863–1932) was a physician and zoologist who was particularly known for his work on sleeping sickness. [...] (Ref. 128868), visit book page.
More on author: Boulenger.
Environment: milieu / climate zone / djupintervall / distribution range
Ekologi
; sötvatten bottenlevande; pH range: 5.0 - ?. Tropical; 22°C - 24°C (Ref. 12468)
Africa: widespread in the Congo River basin, from the rapids just below Pool Malebo (Ref. 85331) to the upper Lualaba (Ref. 45616), in Central African Republic (Ref. 113655), Republic of Congo (Ref. 85331), Democratic Republic of the Congo (Ref. 4910, 41585, 45441, 106245, 106290) and Angola (Ref. 11970, 120641).
Size / Vikt / Age
Könsmognad: Lm ? range ? - ? cm
Max length : 7.7 cm TL hane/ej könsbestämd; (Ref. 11970)
Mjukstrålar i ryggfenan (totalt) : 24; Mjukstrålar i analfenan: 28 - 29. Petrocephalus christyi is distinguished from all other Petrocephalus species in Central Africa by the following combination of characteristics: dorsal fin with 22-24 branched rays, anal fin with 25-29 branched rays, eye large (HL/ED=3,1-4,2), mouth small, 9-13 teeth in the upper jaw, 17-22 teeth in the lower jaw (Ref. 85331). Melanin pattern consisting of two characteristic black patches: (1) a distinct round mark below the anterior base (first to the fifth rays) of the dorsal fin; and (2) a somewhat diffuse crescent-like mark, centered at the base of the caudal fin and extending onto the fleshy dorsal and ventral lobes of this fin (Ref. 85331).
Body shape (shape guide): fusiform / normal.
Life cycle and mating behavior
Könsmognad | Reproduktion | Lek | Ägg | Fecundity | Larver
Gosse, J.-P., 1984. Mormyridae. p. 63-122. In J. Daget, J.-P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ORSTOM, Paris and MRAC, Tervuren. Vol. 1. (Ref. 3203)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Threat to humans
Harmless
Human uses
Verktyg
Special reports
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01549 (0.00838 - 0.02861), b=2.88 (2.72 - 3.04), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245).
Trofisk nivå (Ref.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Resiliens (Ref.
120179): Hög, lägsta populationsfördubblingstid mindre än 15 månader (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
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