Common names from other countries
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Teleostei >
Siluriformes (Catfishes)
鯰形目 (Catfishes) >
Schilbeidae (Schilbid catfishes)
北非鯰科 (Schilbid catfishes)
Etymology: intermedius: From the Latin «rostrum» (snout) and «depressus»
(flattened), referring to the dorsolateral flattened snout
of this species (Ref. 43912).
More on author: Rüppell.
Issue
Until recently, this species was known as Schilbe mystus, but De Vos and Skelton (1990) have shown, after morphological examination of the holotype of Silurus mystus Linnaeus, 1758, that this specimen belongs to the species generally known as Schilbe (Eutropius) niloticus (Rüppel, 1829); in accordance with the international code of zoological nomenclature, the older name, Schilbe mystus, should substitute the more recent name Schilbe niloticus; hence, the species erroneously considered to be Schilbe mystus, is now called Schilbe intermedius Rüppel, 1832, which is the oldest valid name (Ref. 57127).
Environment: milieu / climate zone / depth range / distribution range
生態學
; 淡水 大洋性; 河川洄游 (Ref. 51243); 深度上下限 0 - 60 m (Ref. 34291), usually 0 - 30 m (Ref. 34291). 熱帶
Africa: Senegal, Gambia, Casamance, Corubal, Geba, Little Scarcies, Sassandra, Boubo, Bandama, Agnébi, Mé, Comoé, Tano, Pra, Volta basin, Mono, Sio, Ouémé, Ogun, entire Niger and Chad basins, Cross, Wouri and Sanaga; absent between Little Scarcies and Sassandra; further in the entire Congo River basin, Malagarasi, Luiche, Cunene, Okavango, entire Zambezi including the Kafue system, Lake Kariba, Nile, Lake Victoria basin, Webi Shebeli, Wando, Tana, Galana, Athi, Wami, Rufiji-Ruaha, Lake Rukwa, lower Sabi-Lundi, Shire below Murchison Falls, Lake Chilwa, Ruvu, Pungwe, Limpopo, Incomati and Pongola (Ref. 43912).
非洲: 塞內加爾，甘比亞，卡薩芒斯， Corubal ， Geba ，薩桑德拉河， Boubo ， Bandama ， Agnebi ， Comoe ， Tano ， Pra ，佛塔河，單一， Oueme ， Ogun ，尼日，查德與十字河流域。 非洲: 在蘇丹的尼羅河.(參考文獻 28714) 記錄來自奧塔萬戈河三角州，波札那 (參考文獻 27501) ，尚比亞，莫三比克與南非了,(參考文獻 13332)
Length at first maturity / 大小 / 重量 / 年齡
Maturity: Lm 10.0, range 11 - ? cm
Max length : 50.0 cm SL 雄魚/尚未辨別雌雄; (Ref. 57127); 最大體重: 1.4 kg (Ref. 43912)
背棘 (總數) : 1; 背的軟條 (總數) : 5 - 6; 臀鰭軟條: 41 - 66. Diagnosis: 8-13 gill rakers (exceptionally 7-14, Ref. 43912) on lower limb of first gill arch; 41-66 branched anal-fin rays; eyes positioned laterally (Ref. 43912, 57127, 81643). In the Nile (Ref. 43912) and in West Africa adipose fin usually absent, but specimens with a rudimentary adipose fin occasionally present (Ref. 43912, 57127, 81643). In Central and East Africa populations without as well as with entirely developed adipose fin occur; in several populations both morphotypes are mixed together, the adipose fin being absent or present but sometimes varying in size from a recognizable protrusion low down the back to a fully developed adipose fin; posterior nostrils always closer to each other than are anterior ones; lower jaw reaches beyond snout but hardly remarkable in some specimens, mouth being almost isognath; inner side of pectoral spine feebly serrated; nasal barbel at least reaching to midway between eye and opercle but often reaching beyond this level; small specimens (up to about 15 cm) with typical colour pattern with dark lateral bands along sides and anal fin, this pattern gradually disappearsing in larger specimens, the body becoming in general entirely brownish, yellowish and silvery with very few traces of dark lateral bands (Ref. 43912). Eyes positioned laterally (Ref. 81643).
臀鰭長的, 從排洩孔延伸幾乎到尾鰭的起源。 四對短又嘴巴周圍的觸鬚。 銀灰色, 背面顏色略深.(參考文獻 34290)
Reported to be a pelagic species (Ref. 34290), generally abundant in open water, in both lacustrine and fluviatile conditions, often showing shoaling habits; seems to prefer large or rather large rivers and lakes and apparently rarely penetrates small rivers or small affluents (Ref. 43912). Occur mainly on shallow waters. Migrate to the surface at night (Ref. 34291). Surface feeder; nocturnal, omnivorous, voracious and predaceous (Ref. 43912). Feeds on fish (juvenile as well as adults), insects (aquatic as well as terrestrial ones, larvae as well as adult insects), molluscs, freshwater prawns and other crustaceans, algae and bottom-living and planktonic organisms; vegetable material and eggs were also reported from stomach contents (Ref. 43912). Primarily piscivorous at 13-34 cm TL (Ref. 34291, 43912). Rarely grow to lengths greater than 30 cm SL (Ref. 34290). Maximum total length recorded 60.5 cm (Ref. 43912), 52331). Maximum lifetime observed almost 10 years (Ref. 43912). Spawn throughout the year peaking once (Ref. 34291). Migrate into rivers in fairly compact schools during the rainy season to spawn in floodwater pools (Ref. 34291). Reproduction occurs at high water after the floods (Ref. 43912). Oviparous, eggs are unguarded (Ref. 205). Flesh edible and of good flavour; possible aquaculture species (Ref. 43912).
報告是一個大洋性魚種。 (參考文獻 34290) 出現主要吃淺水域。 迴游到表面在晚上。 (參考文獻 34291) 捕食寬範圍的無脊椎動物包括陸棲的昆蟲與全部或魚的碎片。 (參考文獻 28714) 主要以魚為食在 13-34 公分TL.(參考文獻 34291) 很少對長度大於 30 公分 SL 生長。 (參考文獻 34290) 產卵全年度到達高點一次。 (參考文獻 34291) 在產卵於洪水水池中的雨季的時候在非常緊密的魚群中迴游進入河之內。 (參考文獻 34291) 卵生的, 卵是沒有防衛的.(參考文獻 205)
Distinct pairing (Ref. 205).非洲: 塞內加爾，甘比亞，卡薩芒斯， Corubal ， Geba ，薩桑德拉河， Boubo ， Bandama ， Agnebi ， Comoe ， Tano ， Pra ，佛塔河，單一， Oueme ， Ogun ，尼日，查德與十字河流域。 非洲: 在蘇丹的尼羅河.(參考文獻 28714) 記錄來自奧塔萬戈河三角州，波札那 (參考文獻 27501) ，尚比亞，莫三比克與南非了,(參考文獻 13332)
De Vos, L., 2003. Schilbeidae. p. 97-116 In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux douce et saumâtres de l'Afrique de l'Ouest, Tome 2. Coll. Faune et Flore tropicales 40. Musée Royal de l'Afrique Centrale, Tervuren, Belgique, Museum National d'Histoire Naturalle, Paris, France and Institut de Recherche pour le Développement, Paris, France. 815 p. (Ref. 57127)
CITES (Ref. 128078)
Not Evaluated
人類使用
漁業: 商業性; 養殖: 實驗的
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00708 (0.00540 - 0.00927), b=3.06 (2.98 - 3.14), in cm Total Length, based on LWR estimates for this species (Ref.
93245).
營養階層 (Ref.
69278): 3.6 ±0.60 se; based on food items.
回復力 (Ref.
120179): 中等的, 族群倍增時間最少 1.4 - 4.4年 (tmax=5, probably greater; K=0.1-0.3; Fec = 18,000).
Fishing Vulnerability (Ref.
59153): Low to moderate vulnerability (29 of 100).
