Pliotrema warreni, Warren's sixgill sawshark : gamefish

Pliotrema warreni Regan, 1906

Warren's sixgill sawshark
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Native range | All suitable habitat | Point map | Year 2050
This map was computer-generated and has not yet been reviewed.
Pliotrema warreni   AquaMaps   Data sources: GBIF OBIS
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Image of Pliotrema warreni (Warren\
Pliotrema warreni
Female Photo von Weigmann, S.

Klassifizierung / Names Namen | Synonyme | Catalog of Fishes(Gattung, Arten) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (Haie und Rochen) (sharks and rays) > Pristiophoriformes (Saw sharks) > Pristiophoridae (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).
Eponymy: Professor Dr Ernest Warren (1871–1945) was an English zoologist who moved to Natal (1903) and became first Director of the Natal Museum, Pietermaritzburg (1903–1935). [...] (Ref. 128868), visit book page.
More on author: Regan.

Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet Ökologie

seewasser demersal; tiefenbereich 10 - 915 m (Ref. 122027), usually 60 - 430 m (Ref. 122027). Subtropical; 22°S - 37°S, 19°E - 45°E (Ref. 54706)

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Western Indian Ocean: off Madagascar and from southern Mozambique to Cape Agulhas, South Africa.

Länge bei der ersten Reifung / Größe / Gewicht / Alter

Geschlechtsreife: Lm ?, range 110 - ? cm
Max length : 170 cm TL Männchen/unbestimmt; (Ref. 5578)

Kurzbeschreibung Bestimmungsschlüssel | Morphologie | Morphometrie

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).
Cross section: angular.

Biologie     Fachlexikon (Englisch) (z.B. epibenthic)

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).

Lebenszyklus und Paarungsverhalten Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fruchtbarkeit | Larven

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).

Hauptreferenz Laden Sie Ihre Referenzen hoch | Referenzen | Koordinator : Compagno, Leonard J.V. | Partner

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 Rote Liste Status (Ref. 130435: Version 2025-2 (Global))

  nicht bedroht (LC) ; Date assessed: 16 September 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Bedrohung für Menschen

  Harmless





Nutzung durch Menschen

Fischereien: nicht kommerziell; Sportfisch: ja
FAO - Fischereien: Artbeschreibung; Publication: search | FishSource |

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Schätzungen auf der Grundlage von Modellen

Bevorzugte Temperatur (Ref. 123201): 11.2 - 21.7, mean 15.8 °C (based on 40 cells).
Phylogenetischer Diversitätsindex (Ref. 82804):  PD50 = 0.6270   [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).
Trophische Ebene (Ref. 69278):  4.2   ±0.6 se; based on diet studies.
Widerstandsfähigkeit (Ref. 120179):  sehr niedrig, Verdopplung der Population dauert mehr als 14 Jahre. (Fec=5).
Anfälligkeit der Fischerei (Ref. 59153):  Very high vulnerability (90 of 100). 🛈