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Rajiformes (Skates and rays) >
Rajidae (Skates)
Etymology: Dipturus: Greek, di = two + Greek, pteryx = fin (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Sinh thái học
Biển gần đáy; Mức độ sâu 137 - 403 m (Ref. 5578). Subtropical; 20°S - 31°S, 30°E - 38°E (Ref. 114953)
Western Indian Ocean: off central Mozambique to Durban, South Africa.
Bộ gần gũi / Khối lượng (Trọng lượng) / Age
Maturity: Lm ?  range ? - ? cm
Max length : 66.0 cm TL con đực/không giới tính; (Ref. 5578)
Short description
Hình thái học | Sinh trắc học
A black-spotted longnose skate with an elongated, acutely triangular snout, and a stout tail- just shorter than body and slightly swollen along the mid-section; disc with rounded corners and smooth underside except for small denticles on edges and tip of snout; small thorns on nape and midback to 1st dorsal fin (Ref. 5578). Medium grey to brownish with numerous small dark spots dorsally; grey with conspicuous black pores ventrally (Ref. 5578).
Found on the bottom of the outer shelf and upper slope (Ref. 5578). Probably caught by trawlers (Ref. 5578).Oviparous (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205). Males reaches maturity at ca. 57 cm TL, females at ca. 64 cm TL (Ref. 114953)
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Eggs have horn-like projections on the shell (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. 130435)
Threat to humans
Harmless
Human uses
Thêm thông tin
Age/SizeSự sinh trưởngLength-weightLength-lengthLength-frequenciesSinh trắc họcHình thái họcẤu trùngSự biến động ấu trùngBổ xungSự phong phúBRUVS
Các tài liệu tham khảoNuôi trồng thủy sảnTổng quan nuôi trồng thủy sảnCác giốngDi truyềnElectrophoresesDi sảnCác bệnhChế biếnNutrientsMass conversion
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Estimates based on models
Preferred temperature (Ref.
123201): 8.8 - 21.2, mean 14.4 °C (based on 4 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00282 (0.00133 - 0.00596), b=3.25 (3.08 - 3.42), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Mức dinh dưỡng (Ref.
69278): 3.8 ±0.6 se; based on size and trophs of closest relatives
Thích nghi nhanh (Ref.
120179): thấp, thời gian nhân đôi của chủng quần tối thiểu là 4.5 - 14 năm (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): Moderate to high vulnerability (46 of 100).