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Mormyrops anguilloides  (Linnaeus, 1758)

Cornish jack
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Mormyrops anguilloides
Picture by de Vos, L.

Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Osteoglossiformes (Bony tongues) > Mormyridae (Elephantfishes)
Etymology: Mormyrops: Greek, mormyros = a fish (Sparus sp) + Greek, ops = appearance (Ref. 45335).

Environment / Climate / Range Ecology

Freshwater; demersal; potamodromous (Ref. 51243).   Tropical; 22°C - 24°C (Ref. 12468); 10°S - 21°S

Length at first maturity / Size / Weight / Age

Maturity: Lm 32.5  range ? - ? cm
Max length : 150 cm TL male/unsexed; (Ref. 2915); max. published weight: 15.0 kg (Ref. 52193)

Short description Morphology | Morphometrics

Dorsal spines (total): 0; Dorsal soft rays (total): 21-33; Anal spines: 0; Anal soft rays: 38 - 51. Diagnosis: head depressed, mouth large and terminal; body elongated (Ref. 13337, 52193). Chin (mental swelling) absent; origin of dorsal fin behind origin of anal fin, nearer caudal fin base than tip of snout; dorsal fin shorter than anal fin; mouth width subequal to snout length: snout long (Ref. 52193). SL/Body depth 4.9-7.5; head 3.4-5.1 times in standard length; snout almost as wide as head; interorbital space wide, head length/interorbital space 2.9-6.8; variation in meristic characteristics due to differences in geographic clines (Ref. 2915).

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Africa: White Nile, Lake Albert basin, inland waters from Senegal to Chad, rivers in Cameroon, small coastal basins in the Guinean zone. Widespread in the Congo basin, Lake Malawi, Tanganyika and Mobuto (Ref. 52193). Volta basin, Whebi Shebeli and Juba (as Mormyrops deliciosus). In southern Africa, it is restricted to the middle and lower Zambezi, Buzi, and Pungwe River (Ref. 52307).

Biology     Glossary (e.g. epibenthic)

Juveniles occur in marginal habitats, adults prefer deep quiet water between boulders and below overhangs, away from strong currents; also occurs beneath Salvinia mats and in river estuaries in Lake Kariba; juveniles prey on invertebrates, mainly shrimps and insect larvae; larger individuals feed on small cichlids, minnows and labeos; may live for 8 years or more; breeds in summer during the rainy season; mature females carry 25000 or more eggs (Ref. 7248, 52193). A fractional spawner (Ref. 10606, 10605). Affinities: M. breviceps.

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator | Collaborators

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. 96402)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




Human uses

Fisheries: commercial; gamefish: yes
FAO(Publication : search) | FisheriesWiki | Sea Around Us

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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00724 (0.00387 - 0.01357), b=2.96 (2.78 - 3.14), based on LWR estimates for species & (Sub)Family-body shape (Ref. 93245).
Trophic Level (Ref. 69278):  3.8   ±0.61 se; Based on food items.
Resilience (Ref. 69278):  Low, minimum population doubling time 4.5 - 14 years (K=0.08-0.12; tm > 8).
Vulnerability (Ref. 59153):  Moderate to high vulnerability (47 of 100) .
unknown
Price category (Ref. 80766):   Unknown.