Пластиножаберные (акулы и скаты) (sharks and rays) >
Rajiformes (Skates and rays) >
Rajidae (Skates)
Etymology: Malacoraja: Greek, malakos = soft + Latin, raja, -ae = ray, fis (Raja sp.) (Ref. 45335).
More on author: Barnard.
Environment: milieu / climate zone / depth range / distribution range
экология
; морской батидемерсальный; пределы глубины 450 - 1570 m (Ref. 117245). Deep-water; 67°N - 38°S, 72°W - 25°E
Eastern Atlantic: Baffin Bay-Davis Strait Offshore to Iceland-Faeroe Ridge, off northwest Africa (Rio de Oro), off southern Namibia and South Africa.
Size / Вес / Возраст
Maturity: Lm ? range ? - ? cm
Max length : 70.0 cm TL самец/пол неопределен; (Ref. 4426)
Краткое описание
морфология | морфометрия
Very broad, almost pentagonal disc, light above and abruptly dark below; snout bluntly pointed with a flexible tip, eyes small and close together, and a disc with broadly rounded rear margins and tips (Ref. 5578). Small juveniles with and adults without thorns and covered only with small denticles (Ref. 5578). Slate-grey or greyish-brown above except rear margins of pectoral and pelvic fins and claspers of adult males which are dark brown; dark brown below, sometimes with light blotches (Ref. 5578). Lack of large thorns on its disc posterior to the scapular region (Ref. 6902).
A very rare species inhabiting continental slopes and probably down to the abyssal plains (Ref. 3167). Benthic (Ref. 58426). Adults usually at depths greater than 1,500 m while juveniles are mainly taken from about 450 m downward (Ref. 4426). Minimum depth reported taken from Ref. 4426. Feeds on crustaceans (Ref. 58426). Oviparous (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205).
Life cycle and mating behavior
половая зрелость | размножение | нерест | икра | Fecundity | личинки
Oviparous (Ref. 3167). Paired eggs are laid. Embryos feed solely on yolk (Ref. 50449).
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)
Статус Красного Списка МСОП (Ref. 125652)
Угроза для людей
Harmless
Использование человеком
дополнительная информация
Возраст/РазмерыростЗависимость между длиной и массой телаЗависимость между длинамиРазмерный составморфометрияморфологияличинкидинамика численности личинокпополнениечисленностьBRUVS
ссылкиаквакультура (рыбоводство)особенности рыбоводствастепень растяжениягенетикачастоты аллелейнаследуемостьболезниобработкаNutrientsMass conversion
инструменты
Специальные отчеты
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Estimates based on models
Preferred temperature (Ref.
115969): 3.3 - 8.5, mean 5.9 °C (based on 122 cells).
Phylogenetic diversity index (Ref.
82805): PD
50 = 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00302 (0.00143 - 0.00636), b=3.23 (3.06 - 3.40), in cm total length, based on LWR estimates for this Subfamily-BS (Ref.
93245).
Trophic level (Ref.
69278): 3.5 ±0.50 se; based on food items.
устойчивость к внешним воздействиям (Ref.
120179): низкий, минимальное время удвоения популяции 4.5-14 лет (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): Moderate to high vulnerability (48 of 100) .
Climate Vulnerability (Ref.
125649): (0 of 100) .
Nutrients (Ref.
124155): Calcium = 14.1 [2.5, 45.0] mg/100g ; Iron = 0.328 [0.072, 0.839] mg/100g ; Protein = 15.7 [13.3, 18.1] % ; Omega3 = 0.445 [0.173, 1.313] g/100g ; Selenium = 16.5 [4.6, 50.2] μg/100g ; VitaminA = 6.94 [2.04, 23.89] μg/100g ; Zinc = 0.362 [0.179, 0.773] mg/100g (wet weight);
