分類 / Names
俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Holocephali
全頭亞綱 (銀鮫科) (chimaeras) >
Chimaeriformes (Chimaeras)
銀鮫目 (Chimaeras) >
Chimaeridae (Shortnose chimaeras or ratfishes)
短鼻銀鮫科 (Shortnose chimaeras or ratfishes)
Etymology: Hydrolagus: hydro-, combining form of hydor (Gr.), water; lagos (Gr.), hare, i.e., “water rabbit,” probably referring to three pairs of tooth plates, which tend to protrude from the mouth like a rabbit’s incisors (See ETYFish); alphus: Greek for a white spot on the skin, referring to noticeable white spot on sides (See ETYFish).
Environment: milieu / climate zone / 深度上下限 / distribution range
生態學
海洋 深海底的; 深度上下限 600 - 900 m (Ref. 57721). 熱帶
分布
國家 | FAO區域 | 生態系 | 發現紀錄 | 分布圖 | 簡介 | Faunafri
Eastern Central Pacific: Galapagos Islands.
中太平洋東部: 加拉巴哥群島。
大小 / 重量 / 年齡
成熟度: Lm ? range ? - ? cm
Max length : 41.9 cm TL 雄魚/尚未辨別雌雄; (Ref. 57721); 48.0 cm TL (female)
簡短描述
檢索表 | 型態特徵 | 形態測量圖
Assigned to the genus Hydrolagus based upon the absence of an anal fin. Hydrolagus alphus is distinguished by being medium in size (average PCL 321 mm) and uniform dark brown in color with a distinct white spot (4%-6% BDL) on the lateral side above the pectoral fins. Paired fins with bluish hue and white margins. The dorsal spine longer than triangular shaped first dorsal fin and extends beyond the origin of the second dorsal fin when depressed. Eyes large (40.8–44.5% HDL) and pectoral fins reaching to or beyond insertion of pelvic fins when depressed. Pelvic claspers small, not extending beyond distal edge of pelvic fin, and divided distally for one half their length with slender fleshy denticulate tips. The base of second dorsal fin is long, deeply depressed and light colored in the center, anterior and posterior regions dark, considerably greater in height than the white middle region (Ref. 57721).
Body shape (shape guide): elongated.
對以本屬 Hydrolagus 為基礎的分配那缺乏一個臀鰭。 Hydrolagus alphus 被藉著存在區別中等的在大小方面 (平均 PCL 321 mm) 與全深褐色的顏色在胸鰭之上的側面側邊上具有一個明顯的白色斑點 (4%-6% BDL)。 用藍色的色與白色的邊緣偶鰭。 背部棘長度超過三角形的形狀第一背鰭而且延伸超過第二個背鰭的起源當扁平的。 眼大的 (40.8-44.5% 高密度膽固醇) 而且胸鰭延伸到或者超過腹鰭嵌入點當扁平的。 腹鰭釦緊物小的不延伸超過腹鰭的末梢部邊緣, 而且末梢部地為一一半他們的長度分開有細長的肉質有小齒的頂端。 第二背鰭鰭的基底是長的, 深深地扁平的與淡色的在中央又前面與後面的區域中深色的, 非常地較大的在高度方面超過白色的中央區域.(參考文獻 57721)
Life cycle and mating behavior
成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚
中太平洋東部: 加拉巴哥群島。
Quaranta, K.L., D.A. Didier, D.J. Long and D.A. Ebert, 2006. A new species of chimaeroid, Hydrolagus alphus sp. nov.(Chimaeriformes: Chimaeridae) from the Galapagos Islands. Zootaxa 1377:33-45. (Ref. 57721)
IUCN 瀕危狀態 (Ref. 130435: Version 2025-1)
無危 (LC) ; Date assessed: 02 September 2019
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Estimates based on models
Preferred temperature (參考文獻
123201): 3.7 - 7, mean 5.7 °C (based on 7 cells).
Phylogenetic diversity index (參考文獻
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00331 (0.00137 - 0.00798), b=3.07 (2.86 - 3.28), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
營養階層 (參考文獻
69278): 3.7 ±0.6 se; based on size and trophs of closest relatives
回復力 (參考文獻
120179): 低的, 最小族群倍增時間4.5 - 14 年 (Deep-water species, few large eggs.).
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (38 of 100).
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