Actinopterygii (ray-finned fishes) > Osteoglossiformes
(Bony tongues) > Mormyridae
Etymology: Marcusenius: Becasue of J. Marcusen, author of "Zur Phauna des Schwarzen Meeres", 1867; ichthyologist.
Environment / Climate / Range
Freshwater; demersal. Tropical, preferred ?
Africa: coastal rivers draining into the Indian Ocean, ranging from the Incomati system in the north (Mpumalanga Province of South Africa, and Mozambique) to the Mhlatuze System in KwaZulu-Natal (> 28°S) as its southern limit, including the Pongola which is the type river.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Morphology | Morphometrics
soft rays: 27 - 29. Diagnosed by the following characters: scales in lateral series 70-76 (median 73); scales around caudal peduncle 15-20 (median 18.5); dorsal fin rays 21-24 (median 23); anal fin rays 27-29 (median 28.5); body depth 19.1-26.2% of SL (mean 22.6%); electric organ discharges (EOD) lacking a weak head-negative pre-potential, in females and juveniles Ndur of short duration (typically, 140±S.E. 2.8 ?s at 25°C and ‘‘5% threshold criterion’’); no striking sexual dimorphism in EOD waveform present, but longer EOD duration and statistically significant increase with SL in males (Ref. 75962).
Occurs in fast-flowing, major, perennial rivers, bordered by dense subtropical or tropical vegetation and with high water conductivity. Usually found during the day below undercut river banks, especially in dense network of tree roots. Has been observed high up in river systems with rapid water flow and rocky substrate in Swaziland (Ref. 75962).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Kramer, B., P. Skelton, H. van der Bank and M. Wink, 2007. Allopatric differentiation in the Marcusenius macrolepidotus species complex in southern and eastern Africa: the resurrection of M. pongolensis and M. angolensis, and the description of two new species (Mormyridae, Teleostei). J. Nat. Hist. 41(9-12):647-708. (Ref. 75962)
IUCN Red List Status (Ref. 109396)
CITES (Ref. 94142)
Threat to humans
CountriesFAO areasEcosystemsOccurrencesIntroductionsStocksEcologyDietFood itemsFood consumptionRation
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00501 (0.00212 - 0.01187), b=3.07 (2.86 - 3.28), based on LWR estimates for this (Sub)family-body shape (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 to moderate vulnerability (29 of 100) .