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Rajiformes (Skates and rays) >
Arhynchobatidae (Softnose skates)
Etymology: Bathyraja: Greek, bathys = deep + Latin, raja, -ae = a ray (Raja sp) (Ref. 45335); aleutica: Named for its type locality, Aleutian Islands.
More on author: Gilbert.
Môi trường: môi trường / vùng khí hậu / Mức độ sâu / phạm vi phân phối
Sinh thái học
biển tầng đáy biển sâu; mức độ sâu 15 - 1602 m (Ref. 50550). Deep-water
North Pacific: from the Bering Sea, south to Cape Mendocino, northern California, and far west to northern Japan.
Chiều dài lúc trưởng thành đầu tiên / Bộ gần gũi / Khối lượng (Trọng lượng) / Tuổi
Chín muồi sinh dục: Lm 122.0, range 112 - 132 cm
Max length : 161 cm TL con đực/không giới tính; (Ref. 56527); 154.0 cm TL (female); Khối lượng cực đại được công bố: 23.1 kg (Ref. 56527)
Mô tả ngắn gọn
Khóa để định loại | Hình thái học | Sinh trắc học
This large, rhomboidal skates (1,540 mm TL) have long head length 16.7-24.3% TL) and rounded pectoral apices; interdorsal space is large (1.3-3.1% TL); claspers short and stubby, with tip rounded and not bulbous, with weakly defined pseudosiphon, the dorsal lobe has a short pseudorhipidion, U-shaped cleft, while ventral lobe with a rounded projection; teeth in 34-42 rows on upper jaw, and 32-38 rows on lower jaw; pectoral radials 90; pelvic fins 22; total vertebrae 152; dorsal surface of body with fine prickles, becoming larger on the tail, also with thorns, with males having alar thorns, no malar thorns, middorsal thorns developed and high in number (4-11), nuchal thorns strong (3-5), scapular and tail thorns present, interdorsal thorns weak (1-2). Colouration: dorsal dark brown to grey, dark spots on pectorals, often with ocellus on either pectoral fin, while ventral white, with darker coloration on the snout, gills, disc margins, pelvics, and underside of the tail (Ref. 126515).
Cross section: flattened.
Found in deep waters, on outer continental shelf and upper slope, often over muddy sediments. Reported to feed mainly on benthic crustaceans, including shrimps and crabs, and secondarily on bony fishes (Ref. 126515). Oviparous. Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (Ref. 205). Size at maturity for males 113 cm TL and 125 cm TL for females with males growing to at least 150 cm TL and females grow to about 154 cm TL; reported size at birth is 12-15 cm TL (Ref. 126515). Eggs are deposited in sandy or muddy flats (Ref. 205). Egg capsule measures 120-136 mm long and 73-90 mm wide (Ref. 41249, 41253); golden brown in color, and covered with coarse, striated, and anteriorly-directed prickles, giving it a velvety texture; the cases are with long, curved horns at each corner, with the anterior horns being short and these horns taper and become thin and filamentous at their ends (Ref. 126515).
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).
Knuckey, J.D.S. and D.A. Ebert, 2022. A taxonomic revision of Northeast Pacific softnose skates (Rajiformes: Arhynchobatidae: Bathyraja Ishiyama). Zootaxa 5142(1):1-89. (Ref. 126515)
Tình trạng Sách đỏ IUCN (Ref. 130435: Version 2025-2 (Global))
Mối đe dọa đối với con người
Harmless
Sử dụng của con người
Các nghề cá: bycatch
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Ước tính dựa trên mô hình
Chỉ số đa dạng phát sinh loài (Tài liệu tham khảo 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00309 (0.00212 - 0.00450), b=3.11 (3.00 - 3.22), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref. 93245). |
Mức dinh dưỡng (Tài liệu tham khảo 69278) |
4.1 ±0.76 se; based on food items. |
Thích nghi nhanh (Tài liệu tham khảo 120179) |
thấp, thời gian nhân đôi của chủng quần tối thiểu là 4.5 - 14 năm (Fec assumed to be <100). |
Sự dễ bị tổn thương của nghề đánh cá (Ref. 59153) |
Very high vulnerability (86 of 100). 🛈 |
Loại giá (Ref. 80766) |
Medium.
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