इलाज़मौबरांकी (शारक और रेज़) (sharks and rays)
(Skates and rays) > Rajidae
Etymology: Rostroraja: Latin, rostrum = beak + Latin, raja, -ae = a sting ray (Ref. 45335). More on author: Lacepède.
Environment: milieu / climate zone / depth range / distribution range
; समुद्री ड़िमरसल; गहराई सीमा 30 - 600 m (Ref. 6808), usually 50 - 500 m (Ref. 26999). Subtropical; 56°N - 37°S, 19°W - 23°E
Eastern Atlantic: Ireland and England southward round the Cape (South Africa) to central Mozambique (Ref. 5578), including western Mediterranean (to Tunisia and western Greece).
आकार / वज़न / Age
Maturity: Lm ?  range ? - ? cm
Max length : 230 cm TL पुल्लिंग / अलिंग; (Ref. 11284); 202.0 cm TL (female)
आकृति विज्ञान | मौरफोमैटरिक्स
A giant skate with a broad-based, abruptly narrow-tipped snout covered with small, sharp thorns; pectoral disc angular, and no thorns on nape or back, but three rows of large thorns on tail (Ref. 5578). Larger immature and adult individuals grey with numerous small white spots above, underside white with no black pores; hatchlings plain reddish-brown above, often with blue spots, and white below with broad dusky grey margins on disc (Ref. 5578).
Inhabit shelf and slope waters (Ref. 4426). Found on sand and rock-sand bottom (Ref. 6808). A bottom-predator of bony fishes, other elasmobranchs, fish offal, crabs, shrimps, mysids, octopi, and cuttlefish (Ref. 5578). Minimum depth reported taken from Ref. 4426. Maximum length for female is 202 cm (Ref. 41333). 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 12.5-18.3 cm long and 10.0-13.9 cm wide (Ref. 41250). About 55-156 eggs are produced per individual annually (Ref. 41250).
Life cycle and mating behavior
परिपक्व अवधि | पुनरुत्पत्ति | मछलीऔ का अंडे देना | अंडे | Fecundity | लार्वा
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Eggs are laid in huge cases and take up to 18 months to hatch (Ref. 5578). 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. 123251)
CITES (Ref. 123416)
Threat to humans
Traumatogenic (Ref. 5578)
मात्स्यिकी: लघु वाणिज्य; आखेट मत्स्य: हां
संदर्भजलीयकृषिजलीयकृषि रूपरेखाखींचआनुवंशिकीऐल्लि आवृतियाँहैरेटिबिलटीबीमारीप्रक्रमणNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 8.8 - 17.5, mean 13.5 °C (based on 474 cells).
Phylogenetic diversity index (Ref. 82805
= 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00282 (0.00176 - 0.00451), b=3.17 (3.04 - 3.30), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic level (Ref. 69278
): 4.4 ±0.83 se; based on food items.
लौटाव (Ref. 120179
): निम्न, न्यूनतम जनसंख्या दुगनी होने का समय 4.5 - 14 वर्ष। (Fec=55).
Vulnerability (Ref. 59153
): Very high vulnerability (84 of 100) .
Nutrients (Ref. 124155
): Calcium = 17.4 [2.5, 60.6] mg/100g ; Iron = 0.736 [0.202, 1.960] mg/100g ; Protein = 17.1 [14.8, 19.5] % ; Omega3 = 0.47 [0.19, 1.34] g/100g ; Selenium = 33.5 [8.5, 92.1] μg/100g ; VitaminA = 14 [5, 42] μg/100g ; Zinc = 0.372 [0.179, 0.759] mg/100g (wet weight);