Elasmobranchi (squali e razze) (sharks and rays)
(Skates and rays) > Rajidae
Etymology: Rajella: Latin, raja, -ae = a sting ray (Raja sp.) (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
marino batidemersale; distribuzione batimetrica 102 - 1098 m (Ref. 106604). Deep-water; 27°S - 40°S
Southeast Atlantic: Lüderitz, Namibia to off Cape Agulhas, South Africa.
Size / Peso / Age
Maturity: Lm ?  range ? - ? cm
Max length : 65.1 cm TL maschio/sesso non determinato; (Ref. 106604)
Morfologia | Morfometria
Small skate with a very short, obtusely pointed snout, large, close-set, bulging eyes and a thick disc; tail thick and much longer than body; conspicuous light thorns make disc and tail very rough (Ref. 5578). Light grey to brownish above, with or without darker spots; young with distinctive white-barred pattern; underside white (Ref. 5578).
Found on the upper slope (Ref. 5578). Feed on mysids, lightfishes, and polychaetes (Ref. 5578). Oviparous (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205). Caught by hake trawlers (Ref. 5578).
Life cycle and mating behavior
Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve
Oviparous, 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)
IUCN Red List Status (Ref. 126983)
Threat to humans
BibliografiaAcquacolturaProfilo di acquacolturaVarietàGeneticaFrequenze allelicheEreditarietàMalattieElaborazioneNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 123201
): 6.5 - 13.8, mean 8 °C (based on 11 cells).
Phylogenetic diversity index (Ref. 82804
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00316 (0.00177 - 0.00563), b=3.23 (3.08 - 3.38), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic level (Ref. 69278
): 3.6 ±0.53 se; based on food items.
Resilienza (Ref. 120179
): Basso, tempo minimo di raddoppiamento della popolazione 4.5 - 14 anni (Fec assumed to be <100).
Fishing Vulnerability (Ref. 59153
): Moderate to high vulnerability (46 of 100).