Elasmobranchii (hajar och rockor) (sharks and rays)
(Skates and rays) > Rajidae
(Skates) > Rajinae
Etymology: Raja: Latin, raja, -ae = a sting ray (Raja sp.) (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
; marina bottenlevande; djupintervall ? - 100 m (Ref. 4426). Temperate; 55°N - 24°N, 16°W - 1°W
Eastern Atlantic: southwestern England and Ireland to Rio de Oro in Western Sahara; absent from the North Sea and the Mediterranean.
Length at first maturity / Size / Vikt / Age
Maturity: Lm 74.0, range 73 - ? cm
Max length : 87.0 cm TL hane/ej könsbestämd; (Ref. 6014); publicerad maxvikt: 4.5 kg (Ref. 4699)
Taggstrålar i ryggfenan (totalt): 0; Taggstrålar i analfenan 0; Mjukstrålar i analfenan: 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).
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).
Oviparous (Ref. 3167). Paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (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. 119314)
CITES (Ref. 115941)
Threat to humans
Fiskeri: mindre kommeriell; sportfisk: ja
Estimates of some properties based on models
Preferred temperature (Ref. 115969
): 10.4 - 15.4, mean 12 (based on 138 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00437 (0.00262 - 0.00727), b=3.27 (3.13 - 3.41), in cm Total Length, based on LWR estimates for this species & Genus-body shape (Ref. 93245
Trofisk nivå (Ref. 69278
): 3.9 ±0.2 se; Based on diet studies.
Resiliens (Ref. 69278
): Låg, lägsta populationsfördubblingstid 4,5-14 år (Fec= 54-61).
Vulnerability (Ref. 59153
): Moderate to high vulnerability (53 of 100) .