أشلاق (القروش و الشفانين) (sharks and rays) >
Torpediniformes (Electric rays) >
Narcinidae (Numbfishes)
Etymology: Narcine: Greek, narke = numbness (Ref. 45335).
Eponymy: Dr Edward Nathaniel Bancroft (1772–1842) was a British surgeon at St Georges, London (1805–1811). [...] (Ref. 128868), visit book page.
Environment: milieu / climate zone / نطاق العمق / distribution range
البيئة
بحري القاع; نطاق العمق ? - 35 m (Ref. 114953). Tropical; 35°N - 10°N, 97°W - 60°W (Ref. 114953)
Western Atlantic: North Carolina to northeastern Brazil, including the Gulf of Mexico, Caribbean Sean and the islands of the West Indies. Not in Compagno's 1999 checklist (Ref. 35766). Reported in Brazil (Ref. 53431).
الحجم / وزن / العمر
النضج: Lm ? range ? - ? cm
Max length : 65.0 cm TL ذكر/ مختلط الجنس; (Ref. 114953)
A benthic species on continental and insular shelves. Mainly feeds on invertebrates suction-fed off the bottom. Produces up to 16 embryos during each gestation. Maturity size of males at ca. 23 cm TL; birth size observed to be ca. 9 cm TL (Ref. 114953).
Life cycle and mating behavior
النضج | التكاثر | وضع البيض | بيض | الخصوبة | Larvae
de Carvalho, M.R., 1999. Systematic revision of the electric ray genus Narcine Henle, 1834 (Chondrichthyes: Torpediniformes: Narcinidae), and the higher-level phylogenetic relationships of the orders of elasmobranch fishes (Chondrichthyes). Unpublished Ph.D. thesis, the City University of New York. (Ref. 31157)
IUCN Red List Status (Ref. 130435: Version 2025-1)
استخدامات بشرية
أدوات
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مصادر علي الأنترنت
Estimates based on models
Phylogenetic diversity index (مرجع
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01175 (0.00470 - 0.02937), b=2.88 (2.66 - 3.10), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
مستوى غذائي (مرجع
69278): 3.1 ±0.3 se; based on size and trophs of closest relatives
المرونه (مرجع
120179): منخفض, الحد الزمني الأدني لتضاعف عدد أفراد المجتمع 4.5-14 سنة (Assuming fecundity<100).
Fishing Vulnerability (Ref.
59153): Moderate to high vulnerability (46 of 100).
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