Bagrus bajad, Bayad : fisheries, gamefish

Bagrus bajad (Fabricius, 1775)

Bayad
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Bagrus bajad
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Klassificering / Namn Populärnamn | synonymer | Catalog of Fishes(Släkte, Arter) | ITIS | CoL | WoRMS | Cloffa

> Siluriformes (Catfishes) > Bagridae (Bagrid catfishes)
Etymology: Bagrus: Mozarabic, bagre, taken from Greek, pagros = a fish (Dentex sp.) (Ref. 45335).

Miljö: miljö / Klimatzon / djupintervall / distributionsområde Ekologi

; sötvatten bottenlevande; flodvandrande (Ref. 51243); djupintervall ? - 60 m (Ref. 43507). Tropical; 22°C - 28°C (Ref. 12468)

Utbredning Territorier | FAO områden | Ekosystem | Förekomster | Prickkarta | Utplanteringar | Faunafri

Africa: Nile River, Lake Chad, Niger and Senegal rivers, lakes Mobutu [=Lake Albert] and Turkana (Ref. 3236). Reported from Sanaga River basin (Ref. 27691).

Längd vid första mognad / Storlek / Vikt / Ålder

Könsmognad: Lm 37.4, range 29 - 34 cm
Max length : 112 cm FL hane/ej könsbestämd; (Ref. 43434); common length : 50.0 cm TL hane/ej könsbestämd; (Ref. 13851); publicerad maxvikt: 12.5 kg (Ref. 43434); rapporterad maxålder: 8 år (Ref. 51644)

Kort beskrivning Bestämningsnycklar | Morfologi | Morfometri

Taggstrålar i ryggfenan (totalt) : 1; Mjukstrålar i ryggfenan (totalt) : 8 - 12; Taggstrålar i analfenan: 0; Mjukstrålar i analfenan: 13 - 15; Ryggkotor: 48 - 53. Diagnosis: head much depressed, often ridged (Ref. 4903), roundly pointed when viewed from above (Ref. 28714). Head width 1.6-2.2 times in head length (Ref. 28714, 57125) or 47.5-63% HL (Ref. 81641). Body rather elongate, 5-6 times longer than deep (Ref. 7324, 57125). Premaxillary tooth plate 6-7 times as long as broad, a little shorter than the vomerine tooth plate (Ref. 43434). 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 (Ref. 57125). Adipose fin long, its origin well in front of the anal fin (Ref. 28714), narrowly separated from dorsal fin (Ref. 43434). Width of premaxillary tooth plate 2.5-2.8 times in head length (Ref. 57125). Lobes of caudal fin often with short filaments (Ref. 7324, 13851, 57125). Upper caudal-fin lobe comprised 2-3 times in standard length (Ref. 57125).
Body shape (shape guide): fusiform / normal; Cross section: circular.

Biologi     Ordlista (t.ex. 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), but also feeds on insects, crustaceans and molluscs (some debris and vegetable matter may also be ingested) (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; 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, 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.

Livscykel och parningsbeteende Könsmognad | Reproduktion | Lek | Ägg | Fekunditet | Larver

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).

Huvudreferens Ladda upp dina referenser | referenser | Koordinator | Medarbetare

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)

Status på IUCN:s rödlista (Ref. 130435: Version 2025-2 (Global))

  Least Concern (LC) ; Date assessed: 13 January 2020

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Hot mot människor

  Harmless





Mänskliga användningsområden

Fiskeri: kommersiell; sportfisk: ja
FAO - Vattenbrukssystem: production search; Publication: search | FishSource |

Ytterligare information

Trofisk ekologi
Livsmedelsartiklar (preys)
Födosammansättning
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Frimärken, mynt, diverse.
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Populärnamn
synonymer
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Verktyg

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Ladda ner XML

Sammanfattande sida | Punktdata | Populärnamn | foton

Internet-källor

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: Släkte, Arter | DiscoverLife | ECOTOX | FAO - Vattenbrukssystem: production search; Publication: search | Faunafri | Fishipedia | Fishtrace | GloBI | Google Books | Google Scholar | Google | IGFA World Record | OneZoom | Open Tree of Life | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | TreeBase | Tree of Life | Wikipedia: Go, sök | World Records Freshwater Fishing | Zoologiskt register

Uppskattningar baserade på modeller

Index för fylogenetisk mångfald
(Ref. 82804) 		PD50 = 0.5005 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight a=0.01072 (0.00856 - 0.01342), b=2.95 (2.89 - 3.01), in cm total length, based on LWR estimates for this species (Ref. 93245).
Trofisk nivå
(Ref. 69278) 		4.0   ±0.2 se; based on diet studies.
Generation time 5.6 (4.0 - 13.6) years. Estimated as median ln(3)/K based on 10 growth studies.
Resiliens
(Ref. 120179) 		Låg, lägsta populationsfördubblingstid 4,5-14 år (tm=4-5; tmax=8; K=0.07-0.18; Fec=18,630-47,920).
Sårbarhet i fisket
(Ref. 59153) 		Moderate to high vulnerability (52 of 100). 🛈
Priskategori
(Ref. 80766) 		Unknown.
Näringsämnen
(Ref. 124155) 		Calcium = 61.2 [28.1, 126.1] mg/100g; Iron = 1.58 [0.87, 2.84] mg/100g; Protein = 17.4 [16.1, 18.7] %; Omega3 = 0.412 [0.145, 1.122] g/100g; Selenium = 99.4 [38.0, 226.6] μg/100g; VitaminA = 36.8 [10.7, 134.3] μg/100g; Zinc = 0.968 [0.617, 1.478] mg/100g (wet weight);