Elasmobranchii (sharks and rays) > Rajiformes
(Skates and rays) > Rajidae
Etymology: Raja: Latin, raja, -ae = a sting ray (Raja sp.) (Ref. 45335).
Environment / Climate / Range
Marine; demersal; depth range ? - 100 m (Ref. 4426). Temperate; 55°N - 24°N, 16°W - 1°W
Length at first maturity / Size / Weight / Age
Maturity: Lm 70.0  range ? - ? cm
Max length : 80.0 cm TL male/unsexed; (Ref. 41333); 86.0 cm TL (female); max. published weight: 4.5 kg (Ref. 4699)
soft rays: 0. Eyes conspicuously small; dorsal fins close-set, no thorns between; upper surface predominantly spinulose, underside almost smooth in young, but head and centre of disc prickly in larger specimens; orbital thorns separate, a regular row of about 50 thorns from nape to first dorsal fin; upper surface greyish, olive to light brown with light blotches and long bands, underside white (Ref. 3167).
Eastern Atlantic: southwestern England and Ireland to Rio de Oro in Western Sahara; absent from the North Sea and the Mediterranean.
Found on sandy bottoms, from inshore waters to about 100 m in tidal areas (Ref. 3167). Feed on fishes (Ref. 3167). Oviparous. Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (Ref. 205). Eggs are oblong capsules with stiff pointed horns at the corners deposited in sandy or muddy flats (Ref. 205). Egg capsules are 6.6-10.0 cm long and 4.1-6.3 cm wide (Ref. 41250). About 54-61 eggs are laid by an individual in a year (Ref. 41250).
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.
IUCN Red List Status (Ref. 90363)
CITES (Ref. 94142)
Threat to humans
Fisheries: minor commercial; gamefish: yes
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00479 (0.00299 - 0.00765), b=3.30 (3.17 - 3.43), based on LWR estimates for species & Genus-BS (Ref. 93245
Trophic Level (Ref. 69278
): 3.9 ±0.7 se; Based on diet studies.
Resilience (Ref. 69278
): Low, minimum population doubling time 4.5 - 14 years (Fec= 54-61).
Vulnerability (Ref. 59153
): High vulnerability (62 of 100) .