You can sponsor this page

Mormyrops anguilloides (Linnaeus, 1758)

Cornish jack
Upload your photos and videos
Pictures | Google image

Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Teleostei (teleosts) > Osteoglossiformes (Bony tongues) > Mormyridae (Elephantfishes)
Etymology: Mormyrops: Greek, mormyros = a fish (Sparus sp) + Greek, ops = appearance (Ref. 45335).
More on author: Linnaeus.

Environment: milieu / climate zone / depth range / distribution range Ecology

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

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

Africa: a very wide distribution area which includes most of the West African river basins (Ref. 81274), the White Nile, Uebi Shebeli and Juba (Ref. 3203), and the Congo River basin (Ref. 52193). In southern Africa, restricted to the middle and lower Zambezi, Buzi and Pungwe (Ref. 52193). Also known from Lake Malawi, Lake Tanganyika and Lake Albert [former Lake Mobuto] (Ref. 3203, 52193).

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 Identification keys | Morphology | Morphometrics

Dorsal spines (total): 0; Dorsal soft rays (total): 21 - 33; Anal spines: 0; Anal soft rays: 38 - 51. Diagnosis: head depressed (Ref. 13337, 52193). Body elongated (Ref. 2915, 13337, 52193), shallow (Ref. 28714), ratio standard length/body depth 4.9-7.5 (Ref. 81274). Mouth large (Ref. 13337, 52193) and terminal (Ref. 13337, 28714, 52193, 81274), with 16-28 teeth in upper, and 14-28 in lower jaw (the number of teeth increases with size) (Ref. 81274). Chin (mental swelling) absent (Ref. 52193). Origin of dorsal fin behind origin of anal fin, nearer caudal fin base than tip of snout (Ref. 4903, 52193). Dorsal fin shorter than anal fin; mouth width subequal to snout length (Ref. 52193). Snout long (Ref. 52193), rounded, its length 1/5-1/4 that of the head (Ref. 4903), almost as broad as head (Ref. 2915, 81274). 21-33 dorsal- and 38-50 anal-fin rays (Ref. 52193, 81274). Head 3.4-5.1 times in standard length; interorbital space relatively broad, ratio head length/interorbital width 2.9-6.8; wide ranges for most of the meristic characters are caused by the existence of geographical clines (Ref. 2915, 81274).

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 (Ref. 7248, 52193). Adults/larger individuals are piscivorous (Ref. 28714), feeding on small cichlids, minnows and labeos (Ref. Ref. 7248, 52193). 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 Maturities | Reproduction | Spawnings | Egg(s) | Fecundities | 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. 130435)

  Least Concern (LC) ; Date assessed: 20 June 2018

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

Fisheries: commercial; gamefish: yes
FAO - Publication: search | FishSource |

More information

Trophic ecology
Food items
Diet compositions
Food consumptions
Food rations
Predators
Ecology
Ecology
Population dynamics
Growths
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversions
Recruitments
Abundances
Life cycle
Reproduction
Maturities
Fecundities
Spawnings
Spawning aggregations
Egg(s)
Egg developments
Larvae
Larval dynamics
Distribution
Countries
FAO areas
Ecosystems
Occurrences
Introductions
BRUVS - Videos
Anatomy
Gill areas
Brains
Otoliths
Physiology
Body compositions
Nutrients
Oxygen consumptions
Swimming type
Swimming speeds
Visual pigment(s)
Fish sounds
Diseases / Parasites
Toxicities (LC50s)
Genetics
Genetics
Electrophoreses
Heritabilities
Human related
Aquaculture systems
Aquaculture profiles
Strains
Ciguatera cases
Stamps, coins, misc.
Outreach
Collaborators
References
References

Tools

Special reports

Download XML

Internet sources

Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00562 (0.00422 - 0.00750), b=2.99 (2.91 - 3.07), in cm total length, based on LWR estimates for this species (Ref. 93245).
Trophic level (Ref. 69278):  3.8   ±0.61 se; based on food items.
Resilience (Ref. 120179):  Low, minimum population doubling time 4.5 - 14 years (K=0.08-0.33; tm > 8).
Fishing Vulnerability (Ref. 59153):  Moderate to high vulnerability (47 of 100).
Price category (Ref. 80766):   Unknown.
Nutrients (Ref. 124155):  Calcium = 89 [41, 209] mg/100g; Iron = 1.32 [0.61, 2.81] mg/100g; Protein = 17.7 [15.3, 20.1] %; Omega3 = 0.285 [0.119, 0.717] g/100g; Selenium = 117 [42, 282] μg/100g; VitaminA = 21 [7, 66] μg/100g; Zinc = 0.934 [0.594, 1.879] mg/100g (wet weight);