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) >
Pristiophoriformes (Saw sharks)
鋸鯊目 (Saw sharks) >
Pristiophoridae (Saw sharks)
鋸鯊科 (Saw sharks)
Etymology: Pliotrema: pleion (Gr.), more; trema (Gr.), hole, referring to six gill slits compared with five in Pristiophorus. (See ETYFish); warreni: In honor of English-born South African zoologist Ernest Warren (1871-1945), Director, Natal Government Museum (Pietermaritzburg), who sent specimens to the British Museum. (See ETYFish).
More on author: Regan.
Environment: milieu / climate zone / depth range / distribution range
生態學
海洋 居於水底的; 深度上下限 10 - 915 m (Ref. 122027), usually 60 - 430 m (Ref. 122027). 亞熱帶的; 22°S - 37°S, 19°E - 45°E (Ref. 54706)
Western Indian Ocean: off Madagascar and from southern Mozambique to Cape Agulhas, South Africa.
西印度洋: 外海的馬達加斯加與從莫三比克南部到南非的 Agulhas 角。
Length at first maturity / 大小 / 重量 / 年齡
Maturity: Lm ?, range 110 - ? cm
Max length : 170 cm TL 雄魚/尚未辨別雌雄; (Ref. 5578)
This large six-gilled sawshark is distinguished by the following characters: barbel origin to anterior nostrils 1.4-1.6 times anterior nostrils to symphysis upper jaw; prenarial length 1.3-1.4 times prebarbel length; preoral length 1.8-2.3 times interdorsal space; pectoral-fin anterior margin 1.4-1.5 times dorsal-caudal space; mouth width 3.1-3.9 times spiracle length; the first dorsal fin originates about opposite pectoral-fin free rear tips; lateral trunk dermal denticles tricuspidate, rather flat and imbricated. monospondylous centra 53-56; precaudal diplospondylous centra 4-51; total vertebral centra 154-158; rostrum not constricted between barbel origin and nostrils and barbels that are situated about two thirds way from rostral tip to mouth, with prebarbel length about twice, i.e. 1.7-2.1 times, distance from barbel origin to symphysis of upper jaw (vs. barbels situated about half way from rostral tip to mouth, with prebarbel length about equal, i.e. 1.0-1.1 times, distance from barbel origin to symphysis of upper jaw), prebarbel length 60.2-68.0% (vs. 49.4-52.9% of preoral length), preoral length 1.5-1.7 (vs. 1.9-2.0 times prebarbel length), prenarial length 1.3-1.4 (vs. 1.5-1.7 times prebarbel length). Colouration: medium to dark brown dorsally with a pronounced yellowish longitudinal stripe; uniform white ventrally; the dorsal rostrum surface with two distinct longitudinal dark stripes, lateral rostral teeth dark-edged (Ref. 122027).
唯一的鯊魚有一個鋸狀的吻與 6 對鰓縫。 (參考文獻 5578) 背面灰褐色, 腹面白色的.(參考文獻 6587)
Found on the continental shelf and upper slope to at least 430 m (Ref. 247). Feeds on bony fish, also shrimp, mysids and squid (Ref. 5578). Ovoviviparous (Ref. 50449), with 5 to 7 young in a litter (Ref. 247). Probably uses its saw to stun and kill prey (Ref. 5578). Sometimes caught by sports anglers (Ref. 5578).
棲息於大陸棚與上層斜坡到至少 430 公尺了。 (參考文獻 247) 吃硬骨魚，也捕食蝦，糠蝦與烏賊。 (參考文獻 5578) 卵胎生的 (參考文獻 50449),5 到 7 幼魚在一胎.(參考文獻 247) 可能使用它的鋸子打昏並且殺獵物。 (參考文獻 5578) 有時被運動垂釣者捕獲了。 (參考文獻 5578)
Ovoviviparous, with 5 to 7 young in a litter (others have 7 to 17 developing eggs). Size at birth about 35 cm. Embryos feed solely on yolk (Ref. 50449).西印度洋: 外海的馬達加斯加與從莫三比克南部到南非的 Agulhas 角。
Weigmann, S., O. Gon, R.H. Leeney, E. Barrowclift, P. Berggren, N. Jiddawi and A.J. Temple, 2020. Revision of the sixgill sawsharks, genus Pliotrema (Chondrichthyes, Pristiophoriformes), with descriptions of two new species and a redescription of P. warreni Regan. PLoS ONE, 15 (3)[0228791]:1-56. (Ref. 122027)
IUCN 瀕危狀態 (Ref. 130435)
無危 (LC) ; Date assessed: 16 September 2019
人類使用
漁業: 沒有興趣; 游釣魚種: 是的
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Estimates based on models
Preferred temperature (Ref.
123201): 11.2 - 21.7, mean 15.8 °C (based on 40 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 1.0078 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
營養階層 (Ref.
69278): 4.2 ±0.6 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=5).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (90 of 100).
