分类 / Names
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Teleostei >
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
生态学
; 淡水 居于水底的; 河川洄游 (Ref. 51243); 深度上下限 ? - 60 m (Ref. 43507). 熱帶; 22°C - 28°C (Ref. 12468)
Africa: Nile River, Lake Chad, Niger and Senegal rivers, lakes Mobutu [=Lake Albert] and Turkana (Ref. 3236). Reported from Sanaga River basin (Ref. 27691).
非洲: 尼羅河，查德湖，尼日與塞內加爾河，湖 Mobutu(湖艾伯特湖) 與 Turkana。 記錄來自沙那加河流域了。 (參考文獻 27691)
Length at first maturity / 大小 / 重量 / 年龄
Maturity: Lm 37.4, range 29 - 34 cm
Max length : 112 cm FL 雄鱼/尚未辨别雌雄; (Ref. 43434); common length : 50.0 cm TL 雄鱼/尚未辨别雌雄; (Ref. 13851); 最大体重: 12.5 kg (Ref. 43434); 最大年龄: 8 年 (Ref. 51644)
背棘 (总数) : 1; 背的软条 (总数) : 8 - 12; 臀棘: 0; 臀鳍软条: 13 - 15; 脊椎骨: 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).
身体约略延长了, 5-6 长度与高度比率.(参考文献 7324) 头部多扁平的, 平滑的上方 (参考文献 43434), 但是时常脊 (参考文献 4903), 与圆圆尖当从上方看.(参考文献 28714) 侧线上的眼睛有分离的眼窝边缘.(参考文献 367, 参考文献 11410) 在后部与前鼻孔从彼此是遥远的, 后面的被具有一个触须.(参考文献 11410) 上颌骨前的齿碟 6-7 倍于宽度, 稍微短于牦骨齿碟.(参考文献 43434) 鼻骨触须 0.3-0.6 倍于头长。 (参考文献 367) 上頜骨達到腹面或臀鰭的觸鬚.(參考文獻 43434) 外部的顎觸鬚 0.7-1.1 倍於頭長; 內在的顎觸鬚 1.7-2.1 倍於頭長.(參考文獻 367) 後頭骨活動接觸在一起與第一個背側間的.(參考文獻 42499, 參考文獻 2756) 具有第一個分支條的背鰭有平滑的棘 (參考文獻 367) 延長到短的絲狀突起內了。 (參考文獻 31256, 參考文獻 13851) 標準長度的最長絲狀突起 1/3-1/4 的長度.(參考文獻 7324) 持續背鰭的鰭條腹鰭的後面內部鰭條。 (參考文獻 4912) 倍它的基底 (參考文獻 3036) 與它的長度的長的脂鰭高度 2.5 兩倍長於有鰭條的背鰭, 狹窄地分開一個來自另外的。 (參考文獻 43434) 尾鰭的葉時常有短的絲狀突起。 (參考文獻 7324, 參考文獻 13851) 胸棘長達背棘而且與鋸齒在那在.之內 (參考文獻 2756, 參考文獻 367) 沒有胸的絲狀突起.(參考文獻 3036, 參考文獻 2756) 腹鰭在背鰭的第 5 或第 6個分枝鰭條下面插入。 (參考文獻 3036, 參考文獻 13851) 側線系統由一條管狀海拔的直線，尾鰭的從 scapulare 到中央組成。 (參考文獻 562)
體色 生活標本黃色-呈綠色或黑色的有白色的腹面.(參考文獻 7324, 參考文獻 13851) 鰭比較深色的, 有時淡紅的紫色; 側邊上稚魚有小黑色的斑點。 (參考文獻 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), 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.
发现于湖，沼泽与河了。 (参考文献 31256) 避开咸水。 (参考文献 31439) 几乎度过岩石的裂隙的白天的全部并且是因之少见的.(参考文献 51850) 生命并且吃或在底部的附近.(参考文献 3034) 成鱼专门以鱼为食.(参考文献 31256) 捕食小鱼, 特别地 Alestes spp。 (参考文献 13851), 或 Chrysichthys auratus 当在 Kainji湖中;(参考文献 3034) 也吃昆虫，甲壳动物，软件动物，植物。 (参考文献 28714) 捕捉猎物鲶鱼的效率被面对面攻击最大值, 避开损害被背部的与猎物的胸棘.(参考文献 33614) 此鱼种来到较浅的水域繁殖的有一些指证.(参考文献 43507) 产卵季节延伸从四月到七月。 (参考文献 51850) 亲鱼建立并且保卫巢, 是类似一平坦的体盘有一个中央的洞卵被降低哪里。 (参考文献 51638) 巢的大小与中央的洞仰赖鱼大小。 (参考文献 51638) 雄性变成达到 7 岁,8 年的雌性.(参考文献 51644) 平均的大小与雄性的重量是少于雌性从的相同年龄。 (参考文献 51644, 参考文献 51645) 一个重要的食用鱼。 肉是好的吃与经济重要性 (参考文献 36900), 通常卖作了食物.(参考文献 43521) 相传达到 100,000 g 。
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). 非洲: 尼羅河，查德湖，尼日與塞內加爾河，湖 Mobutu(湖艾伯特湖) 與 Turkana。 記錄來自沙那加河流域了。 (參考文獻 27691)
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)
人类利用
渔业: 商业性; 游钓鱼种: 是的
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 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).
营养阶层 (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.
回复力 (Ref.
120179): 低的, 最小族群倍增时间4.5 - 14 年 (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).
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);
