Actinopteri (ray-finned fishes) > Osteoglossiformes
(Bony tongues) > Mormyridae
Etymology: Isichthys: Greek, isos = equal + Greek, ichthys = fish (Ref. 45335). More on author: Gill.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; demersal; pH range: 5.0 - ?. Tropical; 22°C - 24°C (Ref. 12468)
Africa: coastal basins of Guinea, Sierra Leone and Liberia (Ref. 81274) and the Niger basin through Cameroon and Gabon to the Kouilou River basin (Ref. 81635). Also in the Chiloango in Cabinda Province of Angola (Ref. 120641).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 28.7 cm SL male/unsexed; (Ref. 2915)
Possesses electroreceptors over the entire head, the dorsal region and some parts of the ventral region; absent from the side and the caudal peduncle where the electric organ is located. Electric organ discharge (EOD) rates are of low frequency and sexually dimorphic as to waveform (Ref. 10011).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Bigorne, R., 1990. Mormyridae. p. 122-184. In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux saumâtres d'Afrique de l'Ouest. tome 1. Faune Trop. 28. Musée Royal de l'Afrique Centrale, Tervuren, and ORSTOM, Paris. (Ref. 2915)
IUCN Red List Status (Ref. 123251)
CITES (Ref. 123416)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00871 (0.00480 - 0.01580), b=2.69 (2.53 - 2.85), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic level (Ref. 69278
): 3.2 ±0.3 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (32 of 100) .