Elasmobranchii (sharks and rays) > Squaliformes
(Sleeper and dogfish sharks) > Oxynotidae
Etymology: Oxynotus: Greek, oxys = sharp + Greek, noton = back (Ref. 45335). More on author: Linnaeus.
Environment: milieu / climate zone / depth range / distribution range
Marine; bathydemersal; depth range 40 - 777 m (Ref. 56504), usually - m (Ref. ). Deep-water; 0°C - ; 70°N - 17°S, 25°W - 36°E (Ref. 54693)
Eastern Atlantic: Bay of Biscay and Mediterranean Sea to Senegal, north to Cornwall, England (apparently as a stray). Compagno et al. (Ref. 5578) reports this species as ranging south to Cape Point, South Africa but Springer 1990 (Ref. 10718) notes Bass et al. 1976 as considering specimens from Walvis Bay distinct from Oxynotus centrina calling attention to the considerably greater distance between dorsal fins in Mediterranean specimens than in specimens taken south of the equator.
Length at first maturity / Size / Weight / Age
Maturity: Lm ?, range 50 - ? cm
Max length : 150 cm TL male/unsexed; (Ref. 247); common length : 55.0 cm TL male/unsexed; (Ref. 26999)
Found on the outer continental shelf and upper slope (Ref. 5578). Depth range from 60-660 m (Ref. 247) and from 549-777 m in the eastern Ionian Sea (Ref. 56504). Feeds on polychaetes (Ref. 247) and sipunculids (apparenly a suction feeder which mainly feeds on worm-like prey), which are rapidly digested, and the rapid gastric evacuation could partially explain the vacuity of several guts; teleosts, crustaceans and echinoderms are considered as accessory prey items, thus recorded predation on egg cases of the smallspotted catshark Scyliorhinus canicula remains an occasional phenomenon (Ref. 81816). Ovoviviparous (Ref. 205). Utilized for fishmeal, oil, and smoked and dried salted for human consumption (Ref. 247).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Ovoviviparous, without a placenta, with about 7 or 8 young in a litter (Ref. 247). Distinct pairing with embrace (Ref. 205).
Compagno, L.J.V., 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 1 - Hexanchiformes to Lamniformes. FAO Fish. Synop. 125(4/1):1-249. Rome, FAO. (Ref. 247)
IUCN Red List Status (Ref. 124695)
Threat to humans
Fisheries: minor commercial
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 9.5 - 15.3, mean 13.3 °C (based on 283 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5625 [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
Trophic level (Ref. 69278
): 3.1 ±0.3 se; based on diet studies.
Resilience (Ref. 120179
): Very Low, minimum population doubling time more than 14 years (Fec=7).
Vulnerability (Ref. 59153
): Very high vulnerability (80 of 100) .
Nutrients (Ref. 124155
): Calcium = 6.94 [1.20, 23.86] mg/100g ; Iron = 0.203 [0.044, 0.529] mg/100g ; Protein = 18.6 [16.8, 20.4] % ; Omega3 = 0.236 [0.085, 0.795] g/100g ; Selenium = 17.8 [4.9, 58.2] μg/100g ; VitaminA = 7.94 [1.69, 31.12] μg/100g ; Zinc = 0.331 [0.158, 0.823] mg/100g (wet weight);