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Bagrus bajad  (Forsskål, 1775)

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

Actinopterygii (ray-finned fishes) > Siluriformes (Catfish) > Bagridae (Bagrid catfishes)
Etymology: Bagrus: Mozarabic, bagre, taken from Greek, pagros = a fish (Dentex sp.) (Ref. 45335).

Environment / Climate / Range Ecology

Freshwater; demersal; potamodromous (Ref. 51243); depth range ? - 60 m (Ref. 43507).   Tropical; 22°C - 28°C (Ref. 12468), preferred ?

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

Africa: Nile River, Lake Chad, Niger and Senegal River, Lakes Mobutu (Lake Albert) and Turkana. Reported from Sanaga River basin (Ref. 27691).

Length at first maturity / Size / Weight / Age

Maturity: Lm 41.2, range 29 - 34 cm
Max length : 112 cm FL male/unsexed; (Ref. 43434); common length : 50.0 cm TL male/unsexed; (Ref. 13851); max. published weight: 12.5 kg (Ref. 43434); max. reported age: 8 years (Ref. 51644)

Short description Morphology | Morphometrics

Dorsal spines (total): 1; Dorsal soft rays (total): 8-12; Anal spines: 0; Anal soft rays: 13 - 15; Vertebrae: 48 - 53. Diagnosis: body rather elongate, 5-6 times longer than deep (Ref. 7324, 57125); occipital process 4-6 times longer than broad (Ref. 57125). 9-11 branched dorsal-fin rays (Ref. 57125), the first prolonged into short filaments (Ref. 13851, 31256, 57125). Longest filament comprised 3-4 times in standard length (Ref. 7324, 57125). Predorsal length 2.4-2.6 times in standard length; head width 1.7-2.2 times in head length; width of premaxillary tooth plate 2.5-2.8 times in head length; caudal-fin lobes often prolonged into short filaments; upper caudal-fin lobe comprised 2-3 times in standard length (Ref. 57125).

Biology     Glossary (e.g. epibenthic)

Found in lakes, swamps and rivers (Ref. 31256). Avoids salt water (Ref. 31439). Spends nearly the whole of the daylight hours in crevices of rocks and is therefor seldom seen (Ref. 51850). Lives and feeds on or near the bottom (Ref. 3034). Adults exclusively piscivorous (Ref. 31256). Preys on small fish, particularly Alestes spp. (Ref. 13851), or Chrysichthys auratus as in Lake Kainji (Ref. 3034); also feeds on insects, crustaceans, mollusks, vegetable matter (Ref. 28714). Efficiency of catching prey catfish is maximised by face to face attack, avoiding damage by dorsal and pectoral spines of the prey (Ref. 33614). There is some indication that the species comes to shallower water to breed (Ref. 43507). Spawning season extends from April to July (Ref. 51850). Parents build and guard the nest, which is like a flat disc with a central hole where the eggs are dropped (Ref. 51638). Size of the nest and the central hole depend on the fish size (Ref. 51638). Males become up to 7 years old, females 8 years (Ref. 51644). Mean sizes and weight of males are less than those of females from the same age (Ref. 51644, Ref. 51645). An important food fish. Flesh is good eating and of economic importance (Ref. 36900), commonly sold as food (Ref. 43521). Reputed to reach 100,000 g.

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

Reproduction takes place during high water (Ref. 2756). There is some indication that the species comes to shallower water to breed (Ref. 43507). From 4 breeding fish taken, 3 were from inshore waters and 1 from 40m depth in the open water (Ref. 49805). The nest is a relatively large depression with the shape of a flat dish and proportions relative to the size of the fish (Ref. 51638). A single well formed hole of about 10-15cm in diameter and 10-15cm depth is present nearly in the middle (Ref. 51638). Eggs are laid inside this hole (Ref. 51638). Eggs are white, having a diameter of little more than 1 millimeter (Ref. 45962). Larvae stay in the hole a couple of days after hatching (Ref. 51638). They swim above the nest when disturbed and return to hole after disturbance has stopped (Ref. 51638).

Main reference Upload your references | References | Coordinator | Collaborators

Risch, L.M., 1986. Bagridae. p. 2-35. In J. Daget, J.-P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ISNB, Brussels; MRAC, Tervuren; and ORSTOM, Paris. Vol. 2. (Ref. 3236)

IUCN Red List Status (Ref. 109396)

CITES (Ref. 94142)

Not Evaluated

Threat to humans


Human uses

Fisheries: commercial; gamefish: yes
FAO(Aquaculture: production; ; publication : search) | FisheriesWiki | Sea Around Us

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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5005   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00933 (0.00712 - 0.01223), b=3.00 (2.92 - 3.08), based on LWR estimates for this species (Ref. 93245).
Trophic Level (Ref. 69278):  4.0   ±0.2 se; Based on diet studies.
Resilience (Ref. 69278):  Low, minimum population doubling time 4.5 - 14 years (tm=4-5; tmax=8; K=0.07-0.18; Fec=18,630-47,920).
Prior r = 0.42, 2 SD range = 0.25 - 0.73, log(r) = -0.87, SD log(r) = 0.27, Based on: 9 K, 2 tgen, 1 tmax, 2 Fec records
Vulnerability (Ref. 59153):  Moderate to high vulnerability (52 of 100) .
Price category (Ref. 80766):   Unknown.