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Пластиножаберные (акулы и скаты) (sharks and rays) > Rajiformes (Skates and rays) > Rajidae (Skates)
Etymology: Leucoraja: Greek, leykos = white + Latin, raja = a fish, Raja sp. (Ref. 45335).
More on author: Mitchill.

Environment: milieu / climate zone / depth range / distribution range экология

морской демерсальный; мигрирует в океане (Ref. 51243); пределы глубины 4 - 723 m (Ref. 106604). Temperate; 51°N - 34°N, 79°W - 55°W (Ref. 55278)

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Western Atlantic: Newfoundland Banks and southern Gulf of St. Lawrence in Canada to North Carolina, USA.

Length at first maturity / Size / Вес / Возраст

Maturity: L_m 74.5, range 73 - 76 cm
Max length : 113 cm TL самец/пол неопределен; (Ref. 106604); наибольший возраст (опубликованны данные): 21 годы (Ref. 52109)

Краткое описание определительные ключи | морфология | морфометрия

Disk rounded, with many small dark spots on upper surface. Usually 1-4 ocelli on upper surface on each side of disk, each with a dark brownish center and pale edge. Young have long middorsal row of large spines on disk and tail. Upper jaw has 72 rows of teeth (Ref. 7251). Lower surface usually white but marked with irregular pale brownish blotches (Ref. 6902).

Prefer sandy and gravelly bottoms in shoal water in the north range; to at least 90 m in south (Ref. 7251). Benthic (Ref. 5951). Those caught at Cans, Nova Scotia in Canada were found to have eaten dollarfish, cunner, and squid. Mostly inactive during daylight hours, but active under dark conditions (Ref. 10807). 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 5.5-9.9 cm long and 3.5-5.3 cm wide (Ref. 41249, 7135, 71301). Electric organ discharge (EOD) activity seemed more frequent during dark periods (Ref. 10808). The individual EOD of this species is monophasic, head-negative, and lasts 217 ms (Ref. 10011). This species is used only for the manufacture of fish meal.

Life cycle and mating behavior Maturities | размножение | Spawnings | Egg(s) | Fecundities | личинки

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).

Основная ссылка Upload your references | ссылки | координатор : McEachran, John | соавторы

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)

Статус Красного Списка МСОП (Ref. 130435)

Под угрозой исчезновения (EN) (A2bd); Date assessed: 19 June 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Угроза для людей

Harmless

Использование человеком

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Estimates based on models

Preferred temperature (Ref. 123201): 1.5 - 14.4, mean 7.9 °C (based on 130 cells).

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00263 (0.00232 - 0.00298), b=3.23 (3.20 - 3.26), in cm total length, based on LWR estimates for this species (Ref. 93245).

Trophic level (Ref. 69278): 4.4 ±0.5 se; based on diet studies.

устойчивость к внешним воздействиям (Ref. 120179): очень низкий, минимальное время удвоения популяции более 14 лет (tmax=20.8; tm=11-12; Fec assumed to be <100).

Prior r = 0.04, 95% CL = 0.02 - 0.05, Based on 1 full stock assessment.

Fishing Vulnerability (Ref. 59153): High vulnerability (59 of 100).

Nutrients (Ref. 124155): Calcium = 10.8 [2.1, 52.6] mg/100g; Iron = 0.305 [0.081, 0.865] mg/100g; Protein = 17.6 [14.8, 20.3] %; Omega3 = 0.877 [0.282, 3.251] g/100g; Selenium = 10.7 [2.7, 33.9] μg/100g; VitaminA = 13.1 [4.1, 41.9] μg/100g; Zinc = 0.315 [0.151, 0.571] mg/100g (wet weight);

Leucoraja ocellata (Mitchill, 1815)