Actinopterygii (ray-finned fishes) > Osteoglossiformes
(Bony tongues) > Mormyridae
Etymology: Petrocephalus: Latin, petra = stone + Greek, kephale = head (Ref. 45335). More on author: Pellegrin.
Environment / Climate / Range
Freshwater; demersal. Tropical
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 5.2 cm TL male/unsexed; (Ref. 11970)
soft rays: 25 - 29. Petrocephalus microphthalmus is distinguished from all other Petrocephalus species in Central Africa by the following combination of characteristics: short dorsal fin with only 18 or fewer branched rays, long anal fin with 23-27 branched rays, eye small (HL/ED=4,1-4,8), mouth moderately wide, only 9-11 teeth in the upper jaw, 14-20 teeth in the lower jaw, no more than 10 scales between the anterior base of the anal fin and the lateral line (Ref. 52344, 85331). Absence of black pigment patches, except for a characteristic black blotch on the anterior dorsal fin rays near the origin of this fin; body silvery/purplish, iridescent (Ref. 85331).
Africa: Sanaga River in the north to the more southern Kouilou-Niari River, including the rivers Ntem and Ogowe (Ref. 85331). Also in the middle Congo River basin (Ref. 85331).
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.
IUCN Red List Status (Ref. 90363)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01860 (0.00829 - 0.04172), b=2.85 (2.67 - 3.03), based on LWR estimates for this Genus-BS (Ref. 93245
Trophic Level (Ref. 69278
): 3.1 ±0.4 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .