分類 / Names
俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Elasmobranchii
板鰓亞綱 (鯊魚與魟魚) (sharks and rays) >
Hexanchiformes (Frill and cow sharks)
六鰓鯊目 (Frill and cow sharks) >
Hexanchidae (Cow sharks)
六鰓鮫科 (Cow sharks)
Etymology: Hexanchus: hex (Gr.), six; anchus, etymology unclear, perhaps anchos (Gr.), choke or throttle, referring to how six gill openings of H. griseus extend down onto the throat. (See ETYFish); nakamurai: In honor of Teng’s colleague Hiroshi Nakamura, Fisheries Experiment Station of the Government-General during the Japanese occupation of Taiwan, who illustrated this species as H. griseus in 1936. (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
生態學
海洋 深海底的; 深度上下限 0 - 700 m (Ref. 125614), usually 90 - 600 m (Ref. 6574). 深水域; 33°N - 36°S, 30°E - 178°W
Indo-West Pacific: patchily distributed in most warm-temperate and tropical seas.
中西大西洋: 墨西哥 (參考文獻 13186) ，巴哈馬外，古巴北部，尼加拉瓜與哥斯大黎加。 東大西洋: 法國到摩洛哥, 包括地中海;(參考文獻 13573) 可能地象牙海岸與奈及利亞。 印度洋: 外海的非洲東部與南部 (參考文獻 13573), 亞達伯拉島 (印度); 西澳大利亞.(參考文獻 6871) 西太平洋: 日本，台灣，菲律賓，新加勒多尼亞與澳洲東部.(參考文獻 13573)
Length at first maturity / 大小 / 重量 / 年齡
Maturity: Lm ?, range 142 - ? cm
Max length : 180 cm TL 雄魚/尚未辨別雌雄; (Ref. 125614); 142.0 cm TL (female)
脊椎骨: 155. This slender-bodied shark is readily distinguished from its larger congener (H. griseus) by having a narrower head, relatively larger eyes, 5 large lower comb-shaped anterolateral teeth, a long slender dorsal-caudal space, with distance from the dorsal origin to the upper caudal origin being at least twice the length of the dorsal fin base; with the upper and lower caudal postventral margins forming a strong arch. In life, Color of dorsum a uniform pale brown without a light line extending along the lateral body trunk, the trailing fin edges are white in some specimens and the ventral surface is lighter (Ref. 94780).
一種小的 , 瘦又六條鰓裂的 cowshark, 具有一個狹窄的頭部與大的眼。 (參考文獻 5578) 吻頓尖的, 身體紡錘型.(參考文獻 6871) 背鰭相當小的, 從腹鰭基底的後半段之上變化到的起源在腹鰭嵌入正後方.(參考文獻 6871) 比背鰭小的臀鰭.(參考文獻 6871) 活體有螢光的綠色眼。 (參考文獻 6871) 背部灰褐色的, 腹側灰白的.(參考文獻 6871) 鰭有白色的蔓緣。 (參考文獻 6574)
Found on continental and island shelves and slopes, occasionally near surface or inshore from 0 to 700 m depth. Feeds on small to medium-sized bony fishes and occassionally on crustaceans. Viviparous, with 13-26 young in a litter (Ref. 125614). Size at birth measures to about 40-43 cm TL (Ref. 94780). It is taken as bycatch within its range, but is not commercially important (Ref. 125614). Utilized for its fins, meat and liver oil but of little value due to its relatively small size (Ref. 58048).
棲息於大陸棚與島嶼棚與上層斜坡了, 從 90 到 600 公尺深, 通常在底部之上或附近, 可能移動到表面在晚上.(參考文獻 247,5578) 可能吃硬骨魚與甲殼動物。 (參考文獻 13573) 卵胎生的 (參考文獻 205), 具有 13 幼魚在一胎.(參考文獻 247) 沒有危險性對人已知.(參考文獻 247)
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔魚
Viviparous, with number of young 13 in one litter. Length at birth about 43 cm (Ref. 125614). Distinct pairing with embrace (Ref. 205).中西大西洋: 墨西哥 (參考文獻 13186) ，巴哈馬外，古巴北部，尼加拉瓜與哥斯大黎加。 東大西洋: 法國到摩洛哥, 包括地中海;(參考文獻 13573) 可能地象牙海岸與奈及利亞。 印度洋: 外海的非洲東部與南部 (參考文獻 13573), 亞達伯拉島 (印度); 西澳大利亞.(參考文獻 6871) 西太平洋: 日本，台灣，菲律賓，新加勒多尼亞與澳洲東部.(參考文獻 13573)
Ebert, D.A., W.T. White and H.-H. Ho, 2013. Redescription of Hexanchus nakamurai Teng 1962, (Chondrichthyes: Hexanchiformes: Hexanchidae), with designation of a neotype. Zootaxa 3752(1):020-034. (Ref. 94780)
IUCN 瀕危狀態 (Ref. 130435)
近危 (NT) (A2d); Date assessed: 21 November 2019
人類使用
漁業: 自給性漁業
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Estimates based on models
Preferred temperature (Ref.
123201): 8.1 - 23.9, mean 14.4 °C (based on 1233 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.8281 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00240 (0.00102 - 0.00563), b=3.14 (2.93 - 3.35), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
營養階層 (Ref.
69278): 4.2 ±0.7 se; based on diet studies.
回復力 (Ref.
120179): 非常低的, 最小族群倍增時間超過14 年 (Fec = 13).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (90 of 100).
