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Bagrus bajad (Fabricius, 1775)

Bayad
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Classification / Names প্রচলিত নাম সমূহ | প্রতিনাম সমূহ | Catalog of Fishes(গণ , প্রজাতি ) | 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 বাস্তুসংস্থান

; স্বাদু পানি তলদেশ বিহারী; পোটামোড্রোমাস (Ref. 51243); গভীরতার পরিসীমা ? - 60 m (Ref. 43507). Tropical; 22°C - 28°C (Ref. 12468)

বিতরণ দেশ সমূহ | এফ এ ও এলাকাসমূহ | বাস্তুতন্ত্র | দৃষ্টিগোচর | Point map | প্রচলন | 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 / আকৃতি / ওজন / Age

Maturity: Lm 37.4, range 29 - 34 cm
Max length : 112 cm FL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 43434); common length : 50.0 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 13851); সবের্াচ্চ প্রকাশিত ওজন : 12.5 kg (Ref. 43434); সর্বোচ্চ উলি্ল্লখিত বয়স : 8 বৎসর (Ref. 51644)

Short description সনাক্তকারী নির্দেশক | বহিঃ অঙ্গ সংস্থান | মরফোমেট্রিক্স

পৃষ্ঠীয় কাঁটা (মোট ) : 1; পৃষ্ঠীয় নরম পাখনা দন্ড (মোট ) : 8 - 12; পায়ূ কাঁটা : 0; পায়ূর নরম পাখনা্তুন্ড: 13 - 15; কশেরুকা : 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).

জীববিজ্ঞান     শব্দকোষ (উদাহরণ স্বরূপ 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 | প্রজনন | Spawnings | Egg(s) | Fecundities | শুককীট

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 | সূত্র সংখ্যা | সমম্বয়কারী | সহযোগী

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. 130435)

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

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

মৎস্য: বাণিজ্যিক; শিকারযোগ্য মাছ: হঁ্যা
FAO - Aquaculture systems: উৎপাদন ; ; Publication: search | FishSource |

আরো তথ্য

Life cycle
প্রজনন
Maturities
Fecundities
Spawnings
Spawning aggregations
Egg(s)
Egg developments
শুককীট
শুককীটের সত্রিুয়তা
Anatomy
Gill areas
মস্তিস্ক সমূহ
Otoliths
Physiology
Body compositions
Nutrients
Oxygen consumptions
-এর সাতাঁরের ধরণ
Swimming speeds
Visual pigment(s)
মৎস্য শব্দ
Diseases / Parasites
Toxicities (LC50s)
Genetics
বংশানুগতিবিদ্যা
Electrophoreses
Heritabilities
Human related
Aquaculture systems
একুয়াকালচার নকশাসমূহ
বংশ
Ciguatera cases
Stamps, coins, misc.

হাতিয়ার

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ইন্টারনেট সুত্র

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).
ট্রফিক পর্যায়ে (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.
স্থিতিস্থাপক (Ref. 120179):  নিম্ন/ , সর্বনিম্ন প্রজন দ্বিগুনের সময় ৪.৪-১৪ বৎসর (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).
Price category (Ref. 80766):   Unknown.
Nutrients (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);