(كوسه ها و سپرماهيان) (sharks and rays) >
Rajiformes (Skates and rays) >
Rajidae (Skates)
Etymology: Raja: Latin, raja, -ae = a sting ray (Raja sp.) (Ref. 45335).
Eponymy: Colonel George Montagu (1751–1815) was a soldier and natural history writer. [...] (Ref. 128868), visit book page.
More on author: Fowler.
محیط زیست: محیط زیست / منطقه آب و هوایی / تغييرات عمق / محدوده توزیع
بوم شناسي
دريايي نزديك كف زي; تغييرات عمق 8 - 530 m (Ref. 88171). Temperate; 61°N - 16°N, 18°W - 25°E
Eastern Atlantic: Shetlands, southern North Sea and the western Baltic to Mauritania, including the western part of the Mediterranean (to Tunisia and western Greece).
طول در اولین بلوغ / اندازه / وزن / سن
بلوغ: Lm 61.0  range ? - ? cm
Max length : 102 cm TL جنس نر / بدون خواص جنسي; (Ref. 6014); common length : 50.0 cm TL جنس نر / بدون خواص جنسي; (Ref. 3261); بيشينه سن گزارش شده: 18 سال ها (Ref. 88187)
خارهاي باله پشتي (کل) : 0; خارهاي باله مخرجي: 0. Sub-rhomboid in shape with a short rostrum and rounded wing-tips. Upper surface almost smooth in young, but prickly in large specimens, except for bare centers of pectoral fins and hind part of disc, underside nearly smooth; orbital thorns separate, a regular row of 20-50 usually persistent thorns from nape to first dorsal fin; with 1-2 thorns between dorsal fins; 2 equal-sized dorsal fins at end of tail. Brownish dorsally with numerous small dark spots which do not reach the margin of the disc, frequently with a concentration of dark spots forming a ring around a pale centre on hind part of each pectoral fin, underside white (Ref. 3167).
Body shape (shape guide): other; Cross section: flattened.
Found mainly along the continental shelf (Ref. 3167). Depth range from 8-283 m in the northeast Atlantic (Ref. 82399), in the southern part of its range it occurs down to 530 m (Ref. 78469, 89037), but most common between 20-120 m (Ref. 88187). Prefers habitats with sand or mud bottoms (Ref. 78469). Juveniles usually found in shallow sandy inshore areas, adults utilize more offshore sand or sand-gravel habitats (Ref. 82399, 89038). Species buries itself to avoid predation and ambush potential prey. Feeds mainly on crustaceans (Ref. 3167) with prey size increasing as it grows (Ref. 88171), also preys on benthic worms, cephalopods and small fishes (Ref. 41849, 58137). Most individuals attain a length of 40-60 cm (Ref. 3261). Oviparous. Young may tend to follow large objects, such as their mother (Ref. 205). Detects weak electric fields generated by other organisms and generate its own weak electric fields (Ref. 10311).
چرخه زندگی و رفتار جفتگیری
بلوغ | تولید مثل | تخم ریزی | تخم ها | باروری | توزاد ( لارو)
Oviparous. Distinct pairing with embrace. Paired eggs are laid during summer (Ref. 3167). Eggs are oblong capsules with stiff pointed horns at the corners deposited in sandy or muddy flats (Ref. 205). Egg capsules are 5.3-7.8 cm long and 3.0-5.0 cm wide (Ref. 41250). Fully formed pups hatch after about 5-6 months and are about 11-12 cm in length (Ref. 78469, 88187).
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)
وضعيت در فهرست قرمز IUCN (Ref. 130435: Version 2025-2 (Global))
خطر برای انسان ها
Harmless
استفاده انسانی
ماهي گيري – شيلات: ارزش تحاري اندك
ابزارها
گزارش های ويژه
بارگيری XML
منابع اينترنتي
تخمینها بر اساس مدلها
شاخص تنوع فیلوژنتیکی (مرجع 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
|
Bayesian length-weight
|
a=0.00251 (0.00202 - 0.00312), b=3.25 (3.21 - 3.29), in cm total length, based on LWR estimates for this species (Ref. 93245). |
سطح تروفیک (مرجع 69278) |
3.9 ±0.2 se; based on diet studies. |
جهندگی (مرجع 120179) |
پايين ، كم, كمينه زمان لازم براي دو برابر شدن جمعيت 5/4 – 14 سال (K=0.18-0.21; tm=8; tmax=14; Fec=24). |
|
Rate of population increase |
Prior r = 0.40, 95% CL = 0.27 - 0.61, Based on 1 full stock assessment. |
آسیبپذیری ماهیگیری (Ref. 59153) |
High vulnerability (58 of 100). 🛈 |
آسیبپذیری اقلیمی (Ref. 125649) |
High to very high vulnerability (67 of 100). 🛈 |
طبقه قيمت (Ref. 80766) |
Medium.
|
مواد مغذی (Ref. 124155) |
Calcium = 5.91 [0.83, 102.85] mg/100g; Iron = 0.244 [0.023, 2.859] mg/100g; Protein = 16.8 [14.0, 19.1] %; Omega3 = 1 [0, 2] g/100g; Selenium = 14.6 [3.0, 72.2] μg/100g; VitaminA = 6.24 [0.46, 70.18] μg/100g; Zinc = 0.34 [0.02, 3.74] mg/100g (wet weight); |