Élasmobranches (requins et raies) (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
Écologie
marin bathydémersal; profondeur 450 - 1570 m (Ref. 117245). Deep-water; 3°C - 5°C (Ref. 117245); 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.
Taille / Poids / Âge
Maturity: Lm ?  range ? - ? cm
Max length : 70.0 cm TL mâle / non sexé; (Ref. 4426)
Description synthétique
Clés d'identification | Morphologie | Morphométrie
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). This species is occasionally captured as by-catch (Ref. 117245).
Life cycle and mating behavior
Maturities | Reproduction | Spawnings | Egg(s) | Fecundities | Larves
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)
Statut dans la liste rouge de l'IUCN (Ref. 130435)
Menace pour l'homme
Harmless
Utilisations par l'homme
Outils
Articles particuliers
Télécharger en XML
Sources Internet
Estimates based on models
Preferred temperature (Ref.
123201): 3.3 - 8.5, mean 5.9 °C (based on 122 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00302 (0.00141 - 0.00645), b=3.24 (3.07 - 3.41), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Niveau trophique (Ref.
69278): 3.8 ±0.61 se; based on food items.
Résilience (Ref.
120179): Faible, temps minimum de doublement de population : 4,5 à 14 années (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): Moderate to high vulnerability (48 of 100).
Nutrients (Ref.
124155): Calcium = 9.46 [1.70, 47.25] mg/100g; Iron = 0.362 [0.086, 1.103] mg/100g; Protein = 16.6 [13.7, 19.2] %; Omega3 = 0.61 [0.18, 2.41] g/100g; Selenium = 14.7 [3.9, 48.4] μg/100g; VitaminA = 7.61 [1.88, 30.80] μg/100g; Zinc = 0.341 [0.168, 0.630] mg/100g (wet weight);