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Polypterus senegalus  Cuvier, 1829

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

Actinopterygii (ray-finned fishes) > Polypteriformes (Bichirs) > Polypteridae (Bichirs)
Etymology: Polypterus: Greek, poly = a lot of + Greek, pteron = wing, fin (Ref. 45335).

Environment / Climate / Range Ecology

Freshwater; demersal; pH range: 6.0 - 8.0; dH range: 5 - 19; potamodromous (Ref. 51243).   Tropical; 25°C - 28°C (Ref. 2060)

Length at first maturity / Size / Weight / Age

Maturity: Lm ?, range 15 - 23 cm
Max length : 70.0 cm SL male/unsexed; (Ref. 3188); max. published weight: 207.00 g (Ref. 3013)

Short description Morphology | Morphometrics

Dorsal spines (total): 8 - 11; Anal spines: 11-17; Vertebrae: 53 - 59. Cylindrical body (Ref. 2835, Ref. 3036, Ref. 30488). Body depth 7.6 to 10.6 times in standard length; head length 5.75 to 7 times in standard length (Ref. 2835, Ref. 45628). Upper jaw slightly prominent or sometimes jaws are of equal length (Ref. 1989, Ref. 2756, Ref. 2835). Dorsal fin with 8-11 finlets, anterior separated from each other when folded (Ref. 42908). Number of branched dorsal and caudal rays: 15-19 (Ref. 367, Ref. 2835, Ref. 3069). Pectoral fin not reaching the first dorsal spine (Ref. 2756, Ref. 28714, Ref. 13851, Ref. 30488). Ganoid scales (Ref. 42904): 53-61 lateral line scales, 32-40 scales around body, 14-21 predorsal scales (Ref. 2835, Ref. 42908, Ref. 43745). Dorsal surface uniform olive-colored and ventral side white, without blotches or marbling (Ref. 367, Ref. 3036, Ref. 30488). Fins are gray-colored (Ref. 367). Young specimens have three dark longitudinal bands on the flanks, but these markings disappear at an early age (Ref. 2835, Ref. 13851, Ref. 31439).

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

Africa: Nile basin and West Africa, including Senegal, Gambia, Niger, Volta and Lake Chad basins (Ref. 2835) and Congo River basin (Ref. 3188). Previously, 2 subspecies were recognized: Polypterus senegalus meridionalis and Polypterus senegalus senegalus. Only the former occurs in the Congo River basin, from the upper Lualaba (Ref. 45434) downstream to Yangambi (Ref. 4910), in Democratic Republic of the Congo.

Biology     Glossary (e.g. epibenthic)

This species inhabits marginal swamps and freshwater lagoons (Ref. 3066) and it appears to favor sheltered inshore habitats (Ref. 3034); it inhabits the muddy regions at the sides of rivers and swampy waters, where it lies quiet or glides about with snake-like movements (Ref. 49805). During the hottest hours of the day, it comes to the surface just on the outer edge of the vegetation, and it goes back to the bottom when disturbed (Ref. 45962). It feeds on insects, crustaceans, mollusks, frogs and fishes (Ref. 4903, Ref. 28714). Polypterus senegalus senegalus is mainly insectivorous (Ref. 367). Longevity of Polypterus senegalus in captivity can be 34 years and more (Ref. 48954). Larval fish 1.1-3.8 cm SL were found in papyrus root mat and juveniles up to 10 cm SL retaining external gills were found in fringing water hyacinth. Feeds mainly on fishes (Ref. 9695), insects, crustaceans, mollusks, frogs as well as on plant fragments and seeds.

Main reference Upload your references | References | Coordinator | Collaborators

Gosse, J.-P., 1990. Polypteridae. p. 79-87. In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux douces et saumâtres d'Afrique de l'Ouest. Tome 1. Coll. Faune Trop. n° XXVIII. Musée Royal de l'Afrique Centrale, Tervuren and Éditions de l'ORSTOM, Paris. 384 p. (Ref. 2835)

IUCN Red List Status (Ref. 90363)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




Human uses

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

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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5002   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00347 (0.00168 - 0.00717), b=3.13 (2.94 - 3.32), based on LWR estimates for species & Subfamily-body shape (Ref. 93245).
Trophic Level (Ref. 69278):  3.5   ±0.5 se; Based on diet studies.
Resilience (Ref. 69278):  Very Low, minimum population doubling time more than 14 years (tmax=34; Fec < 1,000).
Vulnerability (Ref. 59153):  Moderate to high vulnerability (50 of 100) .
Price category (Ref. 80766):   Unknown.