Élasmobranches (requins et raies) (sharks and rays) >
Rajiformes (Skates and rays) >
Arhynchobatidae (Softnose skates)
Etymology: Bathyraja: Greek, bathys = deep + Latin, raja, -ae = a ray (Raja sp) (Ref. 45335).
More on authors: Müller & Henle.
Environment: milieu / climate zone / depth range / distribution range
Écologie
marin bathydémersal; profondeur 440 - 1020 m (Ref. 5578). Deep-water; - 40°S
Southeast Atlantic: off central Namibia to Agulhas Bank, South Africa.
Taille / Poids / Âge
Maturity: Lm ? range ? - ? cm
Max length : 120 cm TL mâle / non sexé; (Ref. 5578)
Description synthétique
Morphologie | Morphométrie
A large softnose skate with a broadly triangular, bluntly pointed snout and an angular pectoral disc; tail shorter than body and with a single row of large thorns; upper disc of young with thorns but these are lost with growth (Ref. 5578). Dorsal surface greyish and may have white spots, ventral surface white with dark grey blotches around gill slits, vent and along ventral surface of tail (Ref. 5578). Tail with no color bands (Ref. 5578).
Found on the upper continental slope (Ref. 27121). A bottom-predator that feeds on bony fishes including hake, jacopever, barracudina and dragonet; also squid, octopus, crabs and prawns (Ref. 5578). Oviparous (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205). Sometimes caught by hake trawlers (Ref. 5578).
Life cycle and mating behavior
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
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)
Statut dans la liste rouge de l'IUCN (Ref. 130435)
Menace pour l'homme
Harmless
Utilisations par l'homme
Plus d'informations
Taille/ÂgeCroissanceLongueur-poidsLongueur-longueurFréquences de longueursMorphométrieMorphologieLarvesDynamique des populations larvairesRecrutementAbondanceBRUVS
RéférencesAquacultureProfil d'aquacultureSouchesGénétiqueElectrophoresesHéritabilitéPathologiesTraitementNutrientsMass conversion
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Estimates based on models
Preferred temperature (Ref.
123201): 4.6 - 11.8, mean 5.4 °C (based on 13 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00513 (0.00253 - 0.01042), b=3.12 (2.95 - 3.29), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Niveau trophique (Ref.
69278): 4.3 ±0.67 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): High to very high vulnerability (72 of 100).
