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Squaliformes (Sleeper and dogfish sharks) >
Somniosidae (Sleeper sharks)
Etymology: Somniosus: Latin for sleepy, reflecting Lesueur’s surmise that these sharks are slow or sluggish because of their relatively small fins (hence the name sleeper sharks). (See ETYFish); rostratus: Latin for beaked, referring to its elongated rostrum. (See ETYFish).
More on author: Risso.
Environment: milieu / climate zone / depth range / distribution range
Sinh thái học
Biển Tầng đáy biển sâu; Mức độ sâu 200 - 1330 m (Ref. 104125). Deep-water; 47°N - 43°S
Northeast Atlantic: Madeira, France, and western Mediterranean.
Length at first maturity / Bộ gần gũi / Khối lượng (Trọng lượng) / Age
Maturity: Lm 108.0, range 82 - 134 cm
Max length : 143 cm TL con đực/không giới tính; (Ref. 26346); common length : 100.0 cm TL con đực/không giới tính; (Ref. )
Các tia vây lưng cứng (tổng cộng) : 0; Tia cứng vây hậu môn: 0. Diagnosis: Somniosus rostratus is distinguished from S. longus in having overall length of second dorsal shorter than first dorsal fin 76-88% (vs. almost equal 91-100%); horizontal diameter of eye less than 37% (mean 33%) of length from snout tip to eye (vs. >37, mean 46%); number of tooth rows in upper jaw 53 (vs. 56-57); and spiral valve counts 23 (vs. 26-27) (Ref. 50224).
A rare species (Ref. 26346) found on outer continental shelves and upper slopes (Ref. 247). Probably feeds on deepwater bottom fishes and invertebrates (Ref. 247). Ovoviviparous (Ref. 205), length at birth 21-28 cm TL (Ref. 26346). Utilized as fishmeal and possibly as food fish (Ref. 247).
Life cycle and mating behavior
Maturities | Sự tái sinh sản | Spawnings | Egg(s) | Fecundities | Ấu trùng
Ovoviviparous (Ref. 247). Young born at 21-28 cm (Ref. 26346). Distinct pairing with embrace (Ref. 205).
Yano, K., J.D. Stevens and L.J.V. Compagno, 2004. A review of the systematics of the sleeper shark genus Somniosus with redescriptions of Somniosus (Somniosus) antarcticus and Somniosus (Rhinoscymnus) longus (Squaliformes: Somniosidae). Ichthyol. Res. 51:360-373. (Ref. 50224)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
Các nghề cá: buôn bán nhỏ
Các công cụ
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Estimates based on models
Preferred temperature (Ref.
123201): 8.6 - 14.2, mean 13.2 °C (based on 122 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5313 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00168 - 0.00901), b=3.13 (2.94 - 3.32), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Mức dinh dưỡng (Ref.
69278): 4.2 ±0.4 se; based on diet studies.
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): Very high vulnerability (86 of 100).
Climate Vulnerability (Ref.
125649): Moderate vulnerability (39 of 100).
Nutrients (Ref.
124155): Calcium = 5.4 [1.0, 29.5] mg/100g; Iron = 0.286 [0.068, 0.948] mg/100g; Protein = 19.4 [17.1, 21.6] %; Omega3 = 0.269 [0.098, 0.861] g/100g; Selenium = 18.7 [5.6, 56.5] μg/100g; VitaminA = 11.3 [2.3, 57.4] μg/100g; Zinc = 0.292 [0.137, 0.565] mg/100g (wet weight);
