分類 / Names
共通名の | 類義語 | Catalog of Fishes(部類, 種) | ITIS | CoL | WoRMS | Cloffa
Issue
The species Chrysichthys furcatus Günther, 1864 is considered valid in Eschmeyer (CofF ver. Mar. 2012: Ref. 89686). It is treated here a synonym of Chrysichthys nigrodigitatus (Lacepède, 1803) following Risch (1992: Ref. 7324), Risch (2003: Ref. 57126) and Geerinckx et al. (2007: Ref. 81642).
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 3 - ? m (Ref. 13851). Tropical; 22°C - 28°C (Ref. 12468); 15°N - 13°S, 16°W - 30°E
Africa: Senegal to Cabinda, Angola (Ref. 3236, 81642). To the north also reported from Mauritania (Ref. 55783), southwards down to the lower Congo River (Ref. 1879) and Angolan coastal rivers (Ref. 120641).
Length at first maturity / サイズ / 重さ / 年齢
Maturity: Lm ?, range 14 - ? cm
Max length : 65.0 cm SL オス/雌雄の選別がない; (Ref. 81642)
背面の脊椎 (合計) : 2; 背鰭 (合計) : 6; 肛門の骨: 0. Diagnosis: recognized by its pointed snout, the rather small mouth, and the width of the premaxillary tooth plate (1/5-1/3.5, usually 1/4, of head length); vomerine dentition represented by a square to rectangular tooth plate which begins to develop at sizes between 60 and 70 mm standard length; palatine dentition developing at sizes over 100 mm standard length, initially as isolated teeth; second or third branched dorsal-fin ray always the longest; upper caudal-fin lobe much longer than lower lobe; gill rakers long and smooth; other characters, such as length of dorsal fin, number of branched rays in anal fin, and number of gill rakers on first gill arch, are subject to intraspecific variations; sexually mature males and (some) ripe females show considerable morphological differences; such specimens have often been labelled as Chrysichthys furcatus; maturity occurs probably at a rather advanced stage (at over 200 mm SL) and leads to the inflation of head, broadening of mouth and premaxillary tooth plate, shortening of spines and overgrowth of fin-spines by thick skin, the fins becoming more rounded, and the caudal-fin lobes sometimes becoming subequal; the body acquires an emaciated, thinned down appearance (Ref. 57126, 81642). Characters only clear in mature males in
reproduction: adipose fin short, base contained 8-11 times in SL and measuring 28-64% of distance between dorsal fin and adipose fin; maxillary barbel not reaching beyond dorsal spine when extended; head swollen; skin mucous; spines thick and covered with skin (Ref. 81642).
Adults occur in shallow waters of lakes (less than 4 m), over mud and fine sand bottom. Omnivorous, feed on seeds, insects, bivalves and detritus (Ref. 13851). Feeding becomes specialized with age and size, larger fish may feed on decapods and fish (Ref. 27935).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Risch, L. and E.J. Vreven, 2007. Claroteinae. p. 607-629. In M.L.J. Stiassny, G.G. Teugels and C.D. Hopkins (eds.) The fresh and brackish water fishes of Lower Guinea, West-Central Africa. Volume I. Collection Faune et Flore tropicales 42. Institut de Recherche pour le Développement, Paris, France, Muséum National d’Histoire Naturelle, Paris, France, and Musée Royal de l’Afrique Centrale, Tervuren, Belgium. 800 pp. (Ref. 74659)
IUCNのレッドリストの状況は (Ref. 130435: Version 2024-1)
Human uses
水産業: 少数商業の; 水産養殖: 商業; ゲームフィッシュ: はい
用具
特記事項
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インターネットの情報源
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=0.01000 (0.00794 - 0.01259), b=2.96 (2.91 - 3.01), in cm total length, based on LWR estimates for this species (Ref.
93245).
栄養段階 (Ref.
69278): 3.2 ±0.41 se; based on food items.
回復力 (Ref.
120179): 手段, １．４年～４．４年の倍増期間の最小個体群 (K=0.12-0.65; Fec = 3,086-28,086).
Fishing Vulnerability (Ref.
59153): Low to moderate vulnerability (32 of 100).
Nutrients (Ref.
124155): Calcium = 119 [71, 233] mg/100g; Iron = 1.48 [0.88, 2.35] mg/100g; Protein = 16.8 [15.8, 17.9] %; Omega3 = 0.272 [0.115, 0.642] g/100g; Selenium = 87.9 [39.6, 223.6] μg/100g; VitaminA = 18.6 [7.7, 43.8] μg/100g; Zinc = 1.4 [1.0, 2.0] mg/100g (wet weight);
