أشلاق (القروش و الشفانين) (sharks and rays) >
Rajiformes (Skates and rays) >
Rajidae (Skates)
Etymology: Amblyraja: Greek, amblys = darkness + Latin, raja, -ae = ray (Raja sp.) (Ref. 45335).
Eponymy: Professor Adolf Severin Jensen (1866–1953) was a Danish zoologist, ichthyologist and malacologist. [...] (Ref. 128868), visit book page.
Taxonomic Remarks
Provisionally retained as valid but treated as junior synonym of A. hyperborea by Weigmann (2016, Ref. 106604) due to strong morphological similarity and preliminary molecular data. Further work is needed to resolve this issue (Ref. 118749).
البيئة: الوسط / المنطقة المناخية / نطاق العمق / نطاق التوزيع
البيئة
بحري قاعية المعيشة; نطاق العمق 165 - 3000 m (Ref. 114953). Deep-water; 67°N - 39°N, 72°W - 10°W (Ref. 114953)
Western Atlantic: Nova Scotia, Canada to southern New England, USA; Eastern Atlantic: Iceland (Ref. 12462); North Atlantic: Labrador Sea and off British Isles (Ref. 114953)
الحجم / وزن / العمر
النضج: Lm ?  range ? - ? cm
Max length : 74.3 cm TL ذكر/ مختلط الجنس; (Ref. 4926); 85.0 cm TL (female)
وصف مختصر
مفاتيح التعريف | الوصف الخارجي | قياسات المظهر الخارجي
Lacks large thorns on anterior margins and mid posterior parts of pectorals and on either side of mid-dorsal ridge on the disc. Upper surface plain light brown, either grayish or of chocolate hue, darker along margins of fins. Lower surface brownish gray, grayish white or perhaps pure white (Ref. 6902).
Body shape (shape guide): other.
Benthic (Ref. 58426). Deep-water species. Prefers higher temperatures. Feeds on small fishes and crustaceans (Ref. 6902). Oviparous (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205). Maximum depth reported taken from Ref. 117245. It may be captured as by-catch in deep water fisheries, but due to its depth preference, it is less likely to be vulnerable (Ref. 117245).
دورة الحياة وسلوك التزاوج
النضج | التكاثر | وضع البيض | بيض | الخصوبة | اليرقات
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205).
McEachran, J.D. and K.A. Dunn, 1998. Phylogenetic analysis of skates, a morphologically conservative clade of elasmobranchs (Chondrichthyes: Rajidae). Copeia 1998(2):271-290. (Ref. 27314)
حالة القائمة الحمراء للاتحاد الدولي لحفظ الطبيعة والموارد الطبيعية (Ref. 130435: Version 2025-2 (Global))
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مؤشر التنوع الشُعبي الوراثي (مرجع 82804) |
PD50 = 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00309 (0.00144 - 0.00663), b=3.24 (3.07 - 3.41), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
مستوى غذائي (مرجع 69278) |
3.7 ±0.57 se; based on food items. |
المرونه (مرجع 120179) |
منخفض, الحد الزمني الأدني لتضاعف عدد أفراد المجتمع 4.5-14 سنة (Fec assumed to be <100). |
ضعف الصيد (Ref. 59153) |
High vulnerability (57 of 100). 🛈 |
المغذيات (Ref. 124155) |
Calcium = 4.4 [0.7, 91.3] mg/100g; Iron = 0.345 [0.032, 4.848] mg/100g; Protein = 14.9 [12.9, 17.0] %; Omega3 = 0.479 [0.188, 1.215] g/100g; Selenium = 18.7 [3.3, 89.1] μg/100g; VitaminA = 7.03 [0.51, 95.98] μg/100g; Zinc = 0.266 [0.018, 3.130] mg/100g (wet weight); |