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Bagrus bajad (Fabricius, 1775)

Bayad
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Bagrus bajad
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Egypt country information

Common names: Bagar, Bayad, Forskals catfish
Occurrence: native
Salinity: freshwater
Abundance: | Ref:
Importance: commercial | Ref: Bishai, H.M. and M.T. Khalil, 1997
Aquaculture: | Ref:
Regulations: | Ref:
Uses: live export: yes;
Comments: Known from the Nile River (Ref. 51686), including Lake Nasser (Ref. 3799), Lake Edkou (Ref. 31439), Lake Borollos (Ref. 4904), Lake Karoun (Ref. 4904) and only in the freshwater portion after the high Nile in Lake Menzaleh (Ref. 4904, Ref. 31439). Total production in 1996: 5826 tons, or about 9% of the total Nile catch (Ref. 51850).
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/eg.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Ita, E.O., 1984
National Database:

Common names from other countries

Black Nile catfish, Silver catfish, Avedzeame, ... more

分類 / Names 共通名の | 類義語 | Catalog of Fishes(部類, 種) | ITIS | CoL | WoRMS | Cloffa

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

Environment: milieu / climate zone / depth range / distribution range 生態学

; 新鮮な水 底生の; potamodromous (Ref. 51243); 深さの範囲 ? - 60 m (Ref. 43507).   Tropical; 22°C - 28°C (Ref. 12468)

分布 国々 | 国連食糧農業機関の区域 | エコシステム | 事件 | Point map | 導入 | 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).

Length at first maturity / サイズ / 重さ / 年齢

Maturity: Lm 37.4, range 29 - 34 cm
Max length : 112 cm FL オス/雌雄の選別がない; (Ref. 43434); common length : 50.0 cm TL オス/雌雄の選別がない; (Ref. 13851); 最大公表体重: 12.5 kg (Ref. 43434); 最大記録サイズ: 8 年 (Ref. 51644)

簡単な記述 検索表 | 形態学 | 形態計測学

背面の脊椎 (合計) : 1; 背鰭 (合計) : 8 - 12; 肛門の骨: 0; 臀鰭: 13 - 15; 脊つい: 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).

生物学     用語集 (例 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.

Life cycle and mating behavior Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 幼生

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).

主な参考文献 Upload your references | 参考文献 | コーディネーター | 協力者

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のレッドリストの状況は (Ref. 130435)

  軽度懸念 (LC) ; Date assessed: 13 January 2020

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless




Human uses

水産業: 商業; ゲームフィッシュ: はい
FAO(Aquaculture systems: 代謝; ; publication : search) | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5005   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00955 (0.00766 - 0.01191), b=3.00 (2.94 - 3.06), in cm Total Length, based on LWR estimates for this species (Ref. 93245).
栄養段階 (Ref. 69278):  4.0   ±0.2 se; based on diet studies.
回復力 (Ref. 120179):  低い, ４．５年～１４年の倍増期間の最小個体群 (tm=4-5; tmax=8; K=0.07-0.18; Fec=18,630-47,920).
Fishing Vulnerability (Ref. 59153):  Moderate to high vulnerability (52 of 100).
価格帯 (Ref. 80766):   Unknown.