أشلاق (القروش و الشفانين) (sharks and rays) >
Torpediniformes (Electric rays) >
Narcinidae (Numbfishes)
Etymology: Narcine: Greek, narke = numbness (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
البيئة
بحري قاعية المعيشة; نطاق العمق 170 - 500 m (Ref. 114953). Deep-water; 2°N - 20°S, 35°E - 48°E (Ref. 114953)
Western Indian Ocean: central Somalia to at least Mozambique.
الحجم / وزن / العمر
Maturity: Lm ? range ? - ? cm
Max length : 30.1 cm TL ذكر/ مختلط الجنس; (Ref. 11228)
وصف مختصر
مفاتيح التعريف | الوصف الخارجي | قياسات المظهر الخارجي
Shovel-shaped disc with a long tail (much longer than disc length); a longer-than-wide nasal curtain; slender tooth bands that are subtriangular in shape (Ref. 49866). Uniform light brown or golden-brown dorsally (Ref. 49866).
Known based on 11 specimens. Males mature at 26 cm TL; born at ca. 9 cm TL. Low fecundity based on two mid-term embryos (each just over 7 cm) found in right uterus of large female (Ref. 114953).
Life cycle and mating behavior
Maturities | التكاثر | Spawnings | Egg(s) | Fecundities | Larvae
Heemstra, P.C., 1995. Additions and corrections for the 1995 impression. p. v-xv. In M.M. Smith and P.C. Heemstra (eds.) Revised Edition of Smiths' Sea Fishes. Springer-Verlag, Berlin. (Ref. 11228)
IUCN Red List Status (Ref. 130435)
استخدامات بشرية
أدوات
تقارير خاصة
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مصادر علي الأنترنت
Estimates based on models
Preferred temperature (Ref.
123201): 13.8 - 15.9, mean 15.1 °C (based on 7 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01175 (0.00476 - 0.02897), 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 (Ref.
69278): 3.1 ±0.3 se; based on size and trophs of closest relatives
المرونه (Ref.
120179): منخفض, الحد الزمني الأدني لتضاعف عدد أفراد المجتمع 4.5-14 سنة (Assuming fecundity<100).
Fishing Vulnerability (Ref.
59153): Low vulnerability (20 of 100).
