Nigeria country information

Common names: Afo, Aika, Akau
Occurrence: native
Salinity: freshwater
Abundance: abundant (always seen in some numbers) | Ref: Reed, W., J. Burchard., A.J. Hopson, J. Jenness and I. Yaro, 1967
Importance: commercial | Ref: Ita, E.O., 1984
Aquaculture: commercial | Ref: Garibaldi, L., 1996
Regulations: | Ref:
Uses: live export: yes;
Comments: Known from Ogun River (Ref. 3076), Ona-Omi basin (Ref. 33547), Niger River (Ref. 13851), Sokoto River (Ref. 41503), Kainji Lake (Ref. 3034, 3799, 13864, 28265, 45874, 50384), Benue River (Ref. 3064, 43735, 50352), Hadejia River (Ref. 1880) and Lake Chad (Ref. 41490). Introduced in Cross River (Ref. 31256) and Panyam rivers from Shemankar river (Ref. 50594, Ref. 50611). Introduced for aquaculture for the handsome shape, heavy weight and relatively few bones (Ref. 50594). It did not spawn in ponds less than 3 acres (Ref. 50594). Also 1880, 3031, 26112, 42906, 50611.
National Checklist:
Country Information: httpss://www.cia.gov/library/publications/resources/the-world-factbook/geos/ni.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Paugy, D., 1990
National Database:

Classification / Names

Actinopterygii (ray-finned fishes) > Osteoglossiformes (Bony tongues) > Arapaimidae (Bonytongues)
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL

Common names from other countries

Bony tongue, African arowana, Poisson sans nom, ... more

Main reference

Paugy, D. 1990. (Ref. 2920)
References | Biblio | Coordinator | Collaborators

Size / Weight / Age

Max length : 100.0 cm SL male/unsexed; (Ref. 31256); max. published weight: 10.2 kg (Ref. 2920)

Length at first maturity
L_m ?, range 40 - 40 cm

Environment

Freshwater; pelagic; depth range 1 - ? m (Ref. 13851)

Climate / Range

Tropical; 25°C - 30°C (Ref. 2060), preferred ?; 16°N - 3°N, 17°W - 37°E

Distribution

Africa: native in all the basins of the Sahelo-Sudanese region, the Senegal, Gambia, Corubal, Volta, Ouémé, Niger, Bénoue, Chad and Nile basins and Lake Turkana (Ref. 2920, Ref. 3012, Ref. 3514). Successful introductions in the storage reservoirs of Côte d'Ivoire, the Cross, Sanaga, Nyong and Ogowe rivers and the lower and middle Congo basin, including Ubangui and Kasaï (Ref. 2920); rapidly enlarged its distribution in the Lualaba (upper Congo basin) after extraordinary inundations in 1979 (Ref. 51906). Also introduced in Madagascar (Ref. 13333). Several countries report adverse ecological impact after introduction.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 0; Dorsal soft rays (total): 32-37; Anal spines: 0; Anal soft rays: 34 - 39; Vertebrae: 66 - 69. Elongated and robust body, its height 3.5 to 5 times in standard length (Ref. 2920). Relatively short head, its length 3.5 to 5 times in standard length (Ref. 2920, Ref. 5156). Dermal bones of the cranium are deeply carved by large sensory pits (Ref. 1878, Ref. 2920). The lips are thick and there is a dermal flap on the border of the gill cover (Ref. 13851). Conical teeth (Ref. 5156). Dorsal and anal fins, which are spineless, elongated and posteriorly positioned, ending close to the small, rounded caudal fin (Ref. 3032, Ref. 13851, Ref. 28714, Ref. 30488). Caudal peduncle very short (Ref. 2756, Ref. 3054, Ref. 3069). Strong, large scales (Ref. 28714, Ref. 30488), oval with the exposed portion thick and corrugated, with a more or less vermiform sculpture (Ref. 53264): 34-40 lateral-line scales, 2.5/6 scales on the lateral side of the body before the pelvic fin, 5-6 scales between dorsal and anal fin (Ref. 367, Ref. 2756, Ref. 2920, Ref. 5156). The lateral line is extending in a straight line from above the operculum to the middle of the caudal peduncle (Ref. 1878). The number of gill rakers increases with the length; 33 (young) to 98 on the ceratobranchial and 21 (young) to 76 on the epibranchial (Ref. 2920). Young specimens possess external gills (Ref. 30488). Uniform gray, brown or bronze colored (Ref. 2920), darker during the reproduction-period (Ref. 367). Young specimens are often marked with dark longitudinal bands and scales with an oval spot in the posterior zone of the anal and dorsal fin (Ref. 2920).

Maximum observed length in Lake Kainji: 100 cm, observed weight: 10000 g (Ref. 3034, Ref. 3799). Young found in swampy places among aquatic vegetation (Ref. 5156, Ref. 30488); adults live in the open water of rivers and lakes, where they can be found in the pelagic zone as well as the littoral zone (Ref. 5156). Are able to survive in deoxygenated waters; the hardiness of this fish, together with its great growth rate make it a candidate for aquaculture in Africa and it has been transported to a number of countries for this purpose (Ref. 1739, Ref. 50623). Escapees from ponds into the wild resulted in established populations, which form the basis for fisheries (Ref. 1739). Are considered as mud-feeders (Ref. 6160), but in West Africa also as phytoplankton feeders (Ref. 3023, Ref. 31256). Feed mostly on plankton, being the only plankton-feeders of the Osteoglossidae (Ref. 13851). It has a suprabranchial organ which has a sensory function, but also a mechanic function in concentrating the little food particles (Ref. 3012, Ref. 50624). During breeding, mature adults create a circular nest in swamps (Ref. 13851, Ref. 26281, Ref. 41544). The young leave the nest after a few days and are guarded by the male (Ref. 26281).

IUCN Red List Status (Ref. 115185)

Least Concern (LC)

Threat to humans

Potential pest (Ref. 40814)

Human uses

Fisheries: commercial; aquaculture: commercial; aquarium: commercial

More information

Countries
FAO areas
Ecosystems
Occurrences
Introductions
Stocks
Ecology
Diet
Food items
Food consumption
Ration

Common names
Synonyms
Metabolism
Predators
Ecotoxicology
Reproduction
Maturity
Spawning
Fecundity
Eggs
Egg development

Age/Size
Growth
Length-weight
Length-length
Length-frequencies
Morphometrics
Morphology
Larvae
Larval dynamics
Recruitment
Abundance

References
Aquaculture
Aquaculture profile
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Genetics
Allele frequencies
Heritability
Diseases
Processing
Mass conversion

Collaborators
Pictures
Stamps, Coins
Sounds
Ciguatera
Speed
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Otoliths
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Check for Aquarium maintenance | Check for Species Fact Sheets | Check for Aquaculture Fact Sheets

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Internet sources

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805)
PD₅₀ = 1.0312 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Trophic Level (Ref. 69278)
2.7 ±0.1 se; Based on diet studies.

Resilience (Ref. 69278)
Medium, minimum population doubling time 1.4 - 4.4 years (K=0.22-0.4; Fec > 1,000)

Vulnerability (Ref. 59153)
Moderate to high vulnerability (55 of 100)

Price category (Ref. 80766)
Unknown

Heterotis niloticus (Cuvier, 1829)