(كوسه ها و سپرماهيان) (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: Whitley.
Environment: milieu / climate zone / depth range / distribution range
بوم شناسي
دريايي موجوداتی که در اعماق زیر 200 متر زندگی و تغذیه می کنند; اقیانوس رو (Ref. 51243); تغييرات عمق 33 - 530 m (Ref. 106604). Subtropical; 9°C - 17°C (Ref. 41312); 44°N - 24°N, 81°W - 69°W
Western Atlantic: southern New England to southern Florida in the USA.
Length at first maturity / Size / Weight / سن
Maturity: Lm ?, range 34 - ? cm
Max length : 57.0 cm TL جنس نر / بدون خواص جنسي; (Ref. 106604)
توصيف مختصر
ريخت شناسي | ريخت ستجي بوسيله انداره گيري
Rows of spines along back and sides of tail. Tail rather long. Conspicuous dark rosettes on upper surface of disk in young and adults. Axil of pelvic fin to 1st dorsal fin greater than from axil of pelvic fin to eye (Ref. 7251). Upper surface pale buff or brown freckled with small spots, darker or paler. Lower surface white or pale yellow (Ref. 6902).
Occur mostly on outer edge of continental shelf and upper part of continental slope (Ref. 7251). Known salinities at which it has been taken 33.8 off Block Island to 35.3 off Chesapeake bay (Ref. 6902). Feed mostly on decapod crustaceans and to a lesser extent on amphipods, polychaetes, squids and fishes. Oviparous (Ref. 50449). 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 3.7-5.4 cm long and 2.6-3.0 cm wide (Ref. 41301, 41298). Marketed fresh and salted (Ref. 3824).
Life cycle and mating behavior
بلوغ | تولید مثل | تخم ریزی | تخم ها | Fecundity | توزاد ( لارو)
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)
وضعيت در فهرست قرمز IUCN (Ref. 130435)
خطر برای انسان ها
Harmless
استفاده انسانی
ماهي گيري – شيلات: ارزش تحاري اندك; طعمه: occasionally
اطلاعات بيشتر
Age/Sizeرشدطول - وزنطول - طولنوسانات طولیريخت ستجي بوسيله انداره گيريريخت شناسيتوزاد ( لارو)پويايي لارويبازسازیفراوانيBRUVS
مراجعآبزي پرورينمايه آبزي پرورينژادهاژنتيكElectrophoresesوارثبيماري هافرآوریNutrientsMass conversion
ابزارها
گزارش های ويژه
بارگيری XML
منابع اينترنتي
Estimates based on models
Preferred temperature (Ref.
123201): 10 - 23.2, mean 18.3 °C (based on 20 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00251 (0.00172 - 0.00367), b=3.17 (3.05 - 3.29), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245).
Trophic level (Ref.
69278): 3.6 ±0.0 se; based on diet studies.
جهندگی (Ref.
120179): پايين ، كم, كمينه زمان لازم براي دو برابر شدن جمعيت 5/4 – 14 سال (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (43 of 100).
Nutrients (Ref.
124155): Calcium = 7.79 [0.85, 125.68] mg/100g; Iron = 0.442 [0.039, 5.145] mg/100g; Protein = 16.8 [14.7, 18.9] %; Omega3 = 0.328 [0.129, 0.815] g/100g; Selenium = 15.4 [2.5, 74.0] μg/100g; VitaminA = 43.3 [3.2, 514.0] μg/100g; Zinc = 0.701 [0.049, 8.046] mg/100g (wet weight);
