Bagrus bajad (Forsskål, 1775)

Bayad

Catalog of Fishes (gen., sp.) | ITIS | CoL

Classification	Actinopterygii \| Siluriformes \| Bagridae
Synonyms	Silurus bajad, Porcus bajad, Porcus docmac bayad, ... more
Common names	Silver catfish, Black Nile catfish, 鲿, ... more

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Main reference

Risch, L.M. 1986. (Ref. 3236)
Other references | Biblio | Coordinator | Collaborators

Size / Weight / Age

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)

Environment

Demersal; potamodromous (Ref. 51243); freshwater; depth range ? - 60 m (Ref. 43507)

Climate / Range

Tropical; 22°C - 28°C (Ref. 12468)

Africa: Nile River, Lake Chad, Niger and Senegal River, Lakes Mobutu (Lake Albert) and Turkana. Reported from Sanaga River basin (Ref. 27691).
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 1; Dorsal soft rays (total): 8 - 12; Anal spines: 0; Anal soft rays: 13 - 15; Vertebrae: 48 - 53. Body more or less elongated, 5-6 times longer than high (Ref. 7324). Head much depressed, smooth above (Ref. 43434), but often ridged (Ref. 4903), and roundly pointed when viewed from above (Ref. 28714). Supralateral eyes with a free orbital margin (Ref. 367, Ref. 11410). Posterior and anterior nostrils are remote from each other, the posterior being provided with a barbel (Ref. 11410). Premaxillary tooth plate 6-7 times as long as broad, a little shorter than the vomerine tooth plate (Ref. 43434). Nasal barbel 0.3-0.6 times the head length (Ref. 367). Maxillary barbel reaching ventral or anal fin (Ref. 43434). External mandibular barbel 0.7-1.1 times head length; internal mandibular barbel 1.7-2.1 times head length (Ref. 367). Occipital processus in contact with the first interneural (Ref. 42499, Ref. 2756). Dorsal fin with smooth spine (Ref. 367) with the first branched rays prolonged into short filaments (Ref. 31256, Ref. 13851). Length of the longest filament 1/3-1/4 of standard length (Ref. 7324). Last ray of dorsal fin behind inner ray of ventral fin (Ref. 4912). Adipose fin height 2.5 times in length of its base (Ref. 3036) and its length twice as long as rayed dorsal fin, narrowly separated one from another (Ref. 43434). Lobes of caudal fin often with short filaments (Ref. 7324, Ref. 13851). Pectoral spine as long as dorsal spine and with serrations at the inside (Ref. 2756, Ref. 367). No pectoral filaments (Ref. 3036, Ref. 2756). Pelvic fins inserted under 5th or 6th branched ray of dorsal fin (Ref. 3036, Ref. 13851). Lateral line system consists of a straight line of tubular elevations, from the scapulare to the middle of the caudal fin (Ref. 562). Coloration: life specimens yellow-greenish or blackish with white belly (Ref. 7324, Ref. 13851). Fins darker, sometimes reddish purple; juveniles with little black spots on the sides (Ref. 7324).

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.


IUCN Red List Status (Ref. 57073)	Threat to humans
Least Concern (LC)	Harmless

Human uses
Fisheries: commercial; gamefish: yes


More information
Countries FAO areas Ecosystems Occurrences Introductions Ecology Diet Food items Food consumption Ration	Common names Synonyms Metabolism Predators Ecotoxicology Reproduction Maturity Spawning Eggs Egg development	Age/Size Growth Length-weight Length-length Length-frequencies Morphometrics Morphology Larvae Larval dynamics Recruitment	Other references Biblio Aquaculture Aquaculture profile Strains Genetics Allele frequencies Heritability Diseases Processing	Collaborators Pictures Stamps Sounds Ciguatera Speed Swim. type Gill area Otoliths Brains Vision

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Internet sources

Estimation of some characteristics with mathematical models

Resilience (Ref. 69278)

Medium, minimum population doubling time 1.4 - 4.4 years (tm=4-5; tmax=8; K=0.18; Fec=18,630-47,920)


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
Moderate to high vulnerability (52 of 100)	Not marketed/unknown

Entered by Luna, Susan M.

Modified by Ortañez, Auda Kareen

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