इलाज़मौबरांकी (शारक और रेज़) (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).
Environment: milieu / climate zone / depth range / distribution range
पारिस्थितिकी
समुद्री बाथीड़िमरसल; गहराई सीमा 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.
Length at first maturity / आकार / वज़न / Age
Maturity: Lm 160.0, range 142 - 178 cm
Max length : 230 cm TL पुल्लिंग / अलिंग; (Ref. 124786); 178.0 cm TL (female); common length : 120 cm TL पुल्लिंग / अलिंग; (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 Red List Status (Ref. 130435)
Human uses
अधिक जानकारी
Age/Size
बाढ़
Length-weight
Length-length
Length-frequencies
मौरफोमैटरिक्स
आकृति विज्ञान
लार्वा
लारवल गतिकी
भर्ती
बहुतायत
BRUVS
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इंटरनेट स्रोत
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = No PD50 data [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).
Trophic level (Ref.
69278): 4.3 ±0.5 se; based on size and trophs of closest relatives
लौटाव (Ref.
120179): माध्यम, न्यूनतम जनसंख्या दुगनी होने का समय 1.4 - 4.4 वर्ष। (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (90 of 100).
