Elasmobranchii (Haie und Rochen) (sharks and rays) >
Hexanchiformes (Frill and cow sharks) >
Hexanchidae (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); vitulus: Latin for calf or bullock, i.e., a small cowshark, smaller than its fellow Atlantic congener, H. griseus (See ETYFish).
Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet
Ökologie
seewasser bathydemersal; tiefenbereich 0 - 700 m (Ref. 125614). Tropical; 46°N - 6°N, 98°W - 28°E
Atlantic Ocean: Gulf of Mexico, the Caribbean to Venezuela and Guyanas; Bay of Biscay, from France to Morocco and the Mediterranean.
Länge bei der ersten Reifung / Größe / Gewicht / Alter
Geschlechtsreife: Lm 160.0, range 142 - 178 cm
Max length : 230 cm TL Männchen/unbestimmt; (Ref. 124786); 178.0 cm TL (female); common length : 120 cm TL Männchen/unbestimmt; (Ref. 5217)
Found on continental and insular slopes. Feeds mainly on bony fishes and cephalopods, sometimes on crustaceans Viviparous, with 13 to 26 young in a litter. Size at birth measures to about 40-45 cm TL (Ref. 125614). It was reported that there is likely some stratification of the distribution by size, presumably with larger individuals present in deeper waters (mostly adult captured in the Bahamas at an average depth of 639.5 m) than the juveniles (< 350 m in Belize and northern Gulf of Mexico). Resource and habitat partitioning between juvenile and much larger adult bluntnose sixgill sharks has been suggested as predation avoidance (Ref. 117400).
Viviparous, with number of young 13 in one litter. Length at birth about 40 to 45 cm.
Daly-Engel, T.S., I.E. Baremore, R.D. Grubbs, S.J.B. Gulak, R.T. Graham and M.P. Enzenauer, 2018. Resurrection of the sixgill shark Hexanchus vitulus Springer & Waller, 1969 (Hexanchiformes, Hexanchidae), with comments on its distribution in the northwest Atlantic Ocean. Marine Biodiversity: [1-10]. (Ref. 117400)
IUCN Rote Liste Status (Ref. 130435: Version 2025-2 (Global))
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Schätzungen auf der Grundlage von Modellen
Phylogenetischer Diversitätsindex (Ref. 82804) |
PD50 = 0.6641 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00224 (0.00097 - 0.00516), b=3.15 (2.95 - 3.35), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
Trophische Ebene (Ref. 69278) |
4.3 ±0.5 se; based on size and trophs of closest relatives |
Widerstandsfähigkeit (Ref. 120179) |
mittel, Verdopplung der Population dauert 1,4 - 4,4 Jahre. (Preliminary K or Fecundity.). |
Anfälligkeit der Fischerei (Ref. 59153) |
High vulnerability (61 of 100). 🛈 |