Elasmobranchii (sharks and rays) > Rajiformes
(Skates and rays) > Rajidae
Etymology: Amblyraja: Greek, amblys = darkness + Latin, raja, -ae = ray (Raja sp.) (Ref. 45335).
Possibly a junior synonym of A. hyperborea due to strong morphological similarity according to Ebert & Stehmann (2013, Ref. 98315) and Weigmann (2016, Ref. 118749) (Ref. 118749).
Environment: milieu / climate zone / depth range / distribution range
Marine; bathydemersal; depth range 600 - 2610 m (Ref. 114953). Deep-water; 30°S - 50°S, 78°W - 51°W (Ref. 114953)
Southwest Atlantic: off the mouth of Río de la Plata, Argentina (Ref. 26282, Ref. 114953) and Uruguay (Ref. 58839, Ref. 114953). Possibly Southeast Pacific: Chile (Ref. 27540, Ref. 114953).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 91.0 cm TL male/unsexed; (Ref. 114953)
Found on continental slope and upper abyssal plain. Feeds on small benthic invertebrates, adults possibly piscivorous (Ref. 114953). Oviparous (Ref. 50449). Males reaches maturity by ca. 76 cm TL; young hatch at ca. 22 cm TL (Ref. 114953). Produces horny-shelled eggs (Ref. 205).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
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)
IUCN Red List Status (Ref. 125652)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82804
= 0.5010 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00302 (0.00142 - 0.00642), b=3.23 (3.06 - 3.40), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 4.2 ±0.3 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Fishing Vulnerability (Ref. 59153
): High vulnerability (56 of 100).
Nutrients (Ref. 124155
): Calcium = 10.9 [1.8, 32.7] mg/100g ; Iron = 0.317 [0.077, 0.816] mg/100g ; Protein = 15.8 [13.4, 18.1] % ; Omega3 = 0.5 [0.2, 1.4] g/100g ; Selenium = 16.8 [4.6, 48.7] μg/100g ; VitaminA = 14.2 [4.0, 47.3] μg/100g ; Zinc = 0.271 [0.129, 0.520] mg/100g (wet weight);