Elasmobranchii (hajar och rockor) (sharks and rays) >
Rajiformes (Skates and rays) >
Rajidae (Skates)
Etymology: Dipturus: Greek, di = two + Greek, pteryx = fin (Ref. 45335).
More on author: Mitchill.
Miljö: miljö / Klimatzon / djupintervall / distributionsområde
Ekologi
marina bottenlevande; havsvandrande (Ref. 51243); djupintervall 0 - 750 m (Ref. 55276), usually 0 - 150 m (Ref. 55276). Temperate; 0°C - 20°C; 51°N - 33°N, 84°W - 42°W (Ref. 55276)
Western Atlantic: Grand Bank and southern Gulf of St. Lawrence in Canada to North Carolina, USA. Threatened with extinction by intensive trawling (Ref. 27438).
Storlek / Vikt / Ålder
Könsmognad: Lm ?  range ? - ? cm
Max length : 163 cm TL hane/ej könsbestämd; (Ref. 114953); publicerad maxvikt: 18.0 kg (Ref. 7251)
Kort beskrivning
Bestämningsnycklar | Morfologi | Morfometri
Disk broad, with sharply angled corners and a pointed snout; front edges concave. No middorsal spines on disk. Tail with 3 rows of spine (1 middorsal row and 1 row on each side). Dorsal fins close together (Ref. 7251). Upper surface brownish, with many scattered small dark spots. Mucous pores on nuchal region. Lower surface white, blotched irregularly with gray (Ref. 6902).
Body shape (shape guide): other.
Occur from water's edge to 430 m depth; absent from shoal waters in south during warm months (Ref. 7251). Found in salinities that range from 35 along the continental edge to 31.5 inshore along the open coast and as low as 21-24 (Ref. 6902). Live on all kinds of bottom (Ref. 205). Benthic (Ref. 5951). Feed on bivalve mollusks, squids, rock crabs, lobsters, shrimps, worms and fishes. 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 during summer (with 6-month development) in sandy or muddy flats (Ref. 205, Ref. 114953). Egg capsules are 7.1-13.2 cm long and 4.6-7.4 cm wide (Ref. 41250). Males reaches maturity at ca. 100 cm TL, females at 96-105 cm TL; hatch size at 18-19 cm TL (Ref. 114953). Little use is made of the small quantities that are caught. In some cases, they are made into fish meal.
Livscykel och parningsbeteende
Könsmognad | Reproduktion | Lek | Ägg | Fekunditet | Larver
Oviparous, 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)
Status på IUCN:s rödlista (Ref. 130435: Version 2025-2 (Global))
Hot mot människor
Harmless
Mänskliga användningsområden
Fiskeri: saknar intresse; sportfisk: ja
Verktyg
Särskilda rapporter
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Uppskattningar baserade på modeller
Önskad temperatur (Ref.
123201): 0.9 - 13.9, mean 7.3 °C (based on 497 cells).
Index för fylogenetisk mångfald (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00219 (0.00131 - 0.00366), b=3.22 (3.08 - 3.36), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245).
Trofisk nivå (Ref.
69278): 3.5 ±0.0 se; based on diet studies.
Generation time: 11.0 ( na - na) years. Estimated as median ln(3)/K based on 2
growth studies.
Resiliens (Ref.
120179): Låg, lägsta populationsfördubblingstid 4,5-14 år (Fec assumed to be <100).
Sårbarhet i fisket (Ref.
59153): High to very high vulnerability (69 of 100).
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Sårbarhet för klimatet (Ref.
125649): High vulnerability (60 of 100).
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Näringsämnen (Ref.
124155): Calcium = 4.1 [0.6, 75.0] mg/100g; Iron = 0.259 [0.025, 3.160] mg/100g; Protein = 15.8 [13.7, 17.8] %; Omega3 = 0.68 [0.28, 1.65] g/100g; Selenium = 19 [4, 97] μg/100g; VitaminA = 5.44 [0.42, 65.10] μg/100g; Zinc = 0.287 [0.020, 3.199] mg/100g (wet weight);