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Rajiformes (Skates and rays) >
Rajidae (Skates)
Eponymy: The original description has no etymology, but the binomial is not an eponym: it is derived from the Japanese name for the skate, which is keno-ei. (See Zuge for a similar case). (Ref. 128868), visit book page.
Environment: milieu / climate zone / Mức độ sâu / distribution range
Sinh thái học
Biển gần đáy; Ở đại duơng, biển (Ref. 51243); Mức độ sâu 20 - 230 m (Ref. 106604). Temperate
Northwest Pacific: Japan, Korea and Taiwan (Ref. 8630). Appears to be confined to the continental shelf off Japan and in the China Seas south to about Xiamen (Ref. 47737).
Length at first maturity / Bộ gần gũi / Khối lượng (Trọng lượng) / Age
Chín muồi sinh dục: Lm ?, range 39 - ? cm
Max length : 57.0 cm TL con đực/không giới tính; (Ref. 111281); Khối lượng cực đại được công bố: 815.70 g (Ref. 125279)
Bottom-dweller that feeds on invertebrates and bony fish. 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 4.8-6.6 cm long and 2.9-3.7 cm wide (Ref. 41249, 41253, 41298). Depth range given by H. Ishihara (pers.comm. 07/07).
Oviparous, paired eggs are laid mainly at night (Ref. 44760). Batches of eggs are laid in three to six-day interval on sand bottom. 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)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Human uses
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Estimates based on models
Preferred temperature (Tài liệu tham khảo
123201): 9.8 - 26, mean 22 °C (based on 123 cells).
Phylogenetic diversity index (Tài liệu tham khảo
82804): PD
50 = 0.5001 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00282 (0.00173 - 0.00459), b=3.23 (3.09 - 3.37), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
Mức dinh dưỡng (Tài liệu tham khảo
69278): 3.4 ±0.5 se; based on diet studies.
Thích nghi nhanh (Tài liệu tham khảo
120179): thấp, thời gian nhân đôi của chủng quần tối thiểu là 4.5 - 14 năm (Fec = 40-150;).
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (43 of 100).
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