Élasmobranches (requins et raies) (sharks and rays)
(Skates and rays) > Rajidae
Etymology: Dipturus: Greek, di = two + Greek, pteryx = fin (Ref. 45335).
Junior synonym Raia intermedia Parnell, 1837 (= Dipturus intermedius) is considered valid in CofF ver. January 2018 following Last et al., 2016 (Ref. 114953). Its synonymy under the current species will be removed.
Environment: milieu / climate zone / depth range / distribution range
; marin démersal; profondeur 100 - 1000 m (Ref. 4426), usually 100 - 200 m (Ref. 4426). Subtropical; 69°N - 12°N, 30°W - 42°E
Eastern Atlantic: Norway, Iceland, the Faroes to Senegal, including western Mediterranean and western part of the Baltic. Extirpated by trawling from much of its former range (Ref. 27438).
Length at first maturity / Taille / Poids / Âge
Maturity: Lm 160.0  range ? - ? cm
Max length : 285 cm TL mâle / non sexé; (Ref. 35388); common length : 100.0 cm TL mâle / non sexé; (Ref. 3261); poids max. publié: 97.1 kg (Ref. 40637)
Épines dorsales (Total): 0; Épines anales 0; Rayons mous anaux: 0. Snout very long and pointed; length before eyes 2,5-4,0 times distance between them; disc broadly rhombic with acute outer corners; upper surface and underside smooth in young, partly prickly in larger specimens; no thorns on disc, a row of 12-18 thorns along tail; 40-56 tooth rows; upper surface olive-grey or brown with a variable pattern of light spots, underside ashy-grey to blue-grey (Ref. 3167).
Benthic species in shelf and slope waters with a wide tolerance for depth and temperature (Ref. 4426). Found in coastal waters mainly within the 200 m range (Ref. 3167). Feed on all kinds of bottom animals, large individuals prefer fish (Ref. 3167). Oviparous. Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (Ref. 205). Mate in spring and the egg capsules are laid during the summer. Eggs are oblong capsules with stiff pointed horns at the corners deposited in sandy or muddy flats (Ref. 205). Egg capsules are 10.6-24.5 cm long and 5.0-14.5 cm wide (Ref. 41250). About 40 eggs per individual are laid annually (Ref. 41250). Flesh is marketed fresh or smoked (Ref. 35388).
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Egg-cases laid in spring and summer, very large (Ref. 3167). Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (Ref. 205). 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)
Statut dans la liste rouge de l'IUCN (Ref. 115185)
CITES (Ref. 115941)
Menace pour l'homme
Utilisations par l'homme
Pêcheries: intérêt commercial mineur; pêche sportive: oui
RéférencesAquacultureProfil d'aquacultureSouchesGénétiqueFréquences alléliquesHéritabilitéPathologiesTraitementMass conversion
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Estimates of some properties based on models
Preferred temperature (Ref. 115969
): 7.1 - 15, mean 9.8 (based on 243 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00355 (0.00189 - 0.00667), b=3.17 (3.01 - 3.33), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Niveau trophique (Ref. 69278
): 3.5 ±0.6 se; Based on diet studies.
Résilience (Ref. 69278
): Très faible, temps minimum de doublement de population supérieur à 14 ans (K=0.06; tm=11; tmax=51).
Prior r = 0.14, 2 SD range = 0.03 - 0.58, log(r) = -1.97, SD log(r) = 0.72, Based on: 1 M, 1 K, 1 tgen, 1 Fec records
Vulnérabilité (Ref. 59153
): Very high vulnerability (86 of 100) .