Cetorhinus maximus, Basking shark : fisheries

Cetorhinus maximus (Gunnerus, 1765)

Basking shark
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Cetorhinus maximus   AquaMaps   Data sources: GBIF OBIS
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Image of Cetorhinus maximus (Basking shark)
Cetorhinus maximus
Picture by Murch, A.

Classification / Names Nombres comunes | Sinónimos | Catalog of Fishes(Género, Especie) | ITIS | CoL | WoRMS | Cloffa

Elasmobranquios (tiburones y rayas) (sharks and rays) > Lamniformes (Mackerel sharks) > Cetorhinidae (Basking sharks)
Etymology: Cetorhinus: Greek, ketos = a marine monster, whale + Greek, rhinos = nose (Ref. 45335);  maximus: After Selache Cuvier, 1816, a synonym for Cetorhinus Blainville, 1816.

Environment: milieu / climate zone / depth range / distribution range Ecología

; marino; oceanodromo (Ref. 51243); rango de profundidad - 2000 m (Ref. 26346), usually - m (Ref. 55197).   Temperate; 6°C - 24°C (Ref. 88171); 75°N - 58°S, 111°E - 42°E (Ref. 84930)

Distribución Países | Áreas FAO | Ecosistemas | Ocurrencias, apariciones | Point map | Introducciones | Faunafri

Cosmopolitan, frequent in cold to warm temperate waters; rare in equatorial waters (Ref. 48844). Highly migratory species, Annex I of the 1982 Convention on the Law of the Sea (Ref. 26139). At risk of extinction by overfishing because of low to very low productivity (Ref. 36717). Appendix II (Mediterranean) of the Bern Convention (2002). Appendix I and II of the Bonn Convention (2009). International trade restricted (CITES Appendix II, since 28.5.2003).

Length at first maturity / Tamaño / Peso / Age

Maturity: Lm ?, range 500 - 1000 cm
Max length : 1,520 cm TL macho / no sexado; (Ref. 247); 980.0 cm TL (female); common length : 700 cm TL macho / no sexado; (Ref. 6077); peso máximo publicado: 4.0 t (Ref. 4645)

Short description Morfología | Morfometría

Espinas dorsales (total): 0; Radios blandos dorsales (total): 0; Espinas anales 0; Radios blandos anales: 0. Distinguished from all other sharks by the enormous gill slits practically encircling the head; dermal denticle gill rakers; pointed snout; huge, sub terminal mouth with minute hooked teeth; caudal peduncle with strong lateral keels, and lunate caudal fin. Body covered with placoid scales. Blackish to grey-brown, grey, or blue-grey, often with irregular white blotches under the head and abdomen (Ref. 43278). Also Ref. 309, 5983.

Biología     Glosario (por ej. epibenthic)

The second largest shark, reportedly reaching 1,220-1,520 cm TL (Ref. 247). Thought to live up to 50 years (Ref. 9030, 89083). Semi-oceanic or oceanic species, highly migratory (Ref. 43278). Found on continental and insular shelves, offshore and often close to land, just off the surf zone; enters enclosed bays (Ref. 247). Coastal-pelagic at 1 meter to unknown depths, probably epipelagic (Ref. 58302). Occurs singly, in pairs or groups of 3 or more, or in huge schools (group of up to 100 individuals has been reported) (Ref. 6871, 43278). Prefers water temperature between 8-16 °C (Ref. 88171). Makes extensive horizontal and vertical movements along the continental shelf and shelf edge to utilize productive feeding areas (Ref. 50200). During the summer months, it is found near the surface of boreal to warm-temperate areas (Ref. 43278) feeding on zooplankton by filtering (Ref. 88781). Found in deeper waters during winter (Ref. 6871, 50200, 58302). Undertakes long transoceanic migrations (e.g. from the British Isles to Newfoundland, Canada (Ref. 88824)) and moves between the northern and southern hemisphere in tropical mesopelagic water (Ref. 88825). These migrations have been found to cover distances of over 9,000 km. May form segregations by size or sex (Ref. 88171). Ovoviviparous (Ref. 50449). Regarded as ordinarily harmless and inoffensive but potentially dangerous if attacked (particularly when harpooned) (Ref. 247). In Bay of Fundy, Canada parasitic lampreys have been found attached to the back of basking sharks and sucking their blood (Ref. 83375). Utilized fresh, frozen and dried, or salted (Ref. 9987). Also valued for its liver for oil, fins for soup, hide for leather and carcass for fishmeal (Ref. 247). May be a potential source of anti-carcinoma drugs (Ref. 6034, 6035). Used in Chinese medicine (Ref. 12166). Threatened due to bycatch fisheries (Ref. 83294).

Life cycle and mating behavior Madurez | Reproducción | Puesta | Huevos | Fecundidad | Larva

Distinct pairing with embrace (Ref. 205). Courtship behaviour patterns associated with elasmobranch reproduction were documented from an aerial observation which include 'parallel swimming', 'pectoral biting', 'nudging', and 'male on top of female'. Other mating behaviours particular to this species from the same aerial observation include nose-to-tail following; flank approach; close approach involving rostral contact or proximity with the gill, pectoral fin, vent, and dorsum; and echelon swimming (Ref. 37026). Exhibit ovoviparity (aplacental viviparity), with embryos feeding on other ova produced by the mother (oophagy) after the yolk sac is absorbed (Ref. 50449). Estimated gestation period 12-36 months (Ref. 247, 1765, 9030, 88829); TL at birth estimated between 150-200 cm; mating thought to take place during early summer; a female giving birth to young captured in August in Norwegian waters (Ref. 5983). Over a study period of 5 years, courtship-like behaviour was observed off southwest England between May and July, always in surface waters along thermal fronts; because actual mating was not observed, this may occur in deeper water (Ref. 88831). A one-year resting period between pregnancies is thought to occur, resulting in a 2-4 year interval between litters (Ref. 9030, 1765, 88829). Only one pregnant female has been observed giving birth to a litter of 6 pups (Ref. 88830).

Main reference Upload your references | Referencias | Coordinador : Compagno, Leonard J.V. | Colaboradores

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)

  Endangered (EN) (A2bd); Date assessed: 07 November 2018

CITES


Threat to humans

  Traumatogenic (Ref. 247)





Human uses

Pesquerías: comercial
FAO - pesquerías: landings, species profile; Publication: search | FIRMS - Stock assessments | FishSource | Sea Around Us

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Sinónimos
Metabolismo
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Ecotoxicología
Reproducción
Madurez
Puesta
Agregación para la puesta
Fecundidad
Huevos
Egg development
Referencias
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Perfil de acuicultura
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Frecuencias de alelos
heritabilidad
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Fuentes de Internet

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: Género, Especie | DiscoverLife | DORIS | ECOTOX | FAO - pesquerías: landings, species profile; Publication: search | Faunafri | Fishipedia | Fishtrace | GenBank: genome, nucleotide | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Bases de datos nacionales | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | Árbol de la vida | Wikipedia: Go, búsqueda | World Records Freshwater Fishing | Expediente Zoológico

Estimates based on models

Preferred temperature (Ref. 115969): 5.4 - 22.7, mean 11.4 °C (based on 10877 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 1.5000   [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).
Nivel trófico (Ref. 69278):  3.2   ±0.3 se; based on diet studies.
Generation time: 17.7 ( na - na) years. Estimated as median ln(3)/K based on 1 growth studies.
Resiliencia (Ref. 120179):  Muy bajo, población duplicada en un tiempo mínimo superior a 14 años (Fec=1-2; Musick et al. 2000 (Ref. 36717)).
Prior r = 0.07, 95% CL = 0.03 - 0.26, Based on 2 stock assessments.
Vulnerability (Ref. 59153):  Very high vulnerability (86 of 100) .
Price category (Ref. 80766):   Low.
Nutrients (Ref. 124155):  Calcium = 2.76 [0.33, 10.60] mg/100g ; Iron = 0.222 [0.054, 0.638] mg/100g ; Protein = 19.2 [16.5, 21.7] % ; Omega3 = 0.3 [0.1, 0.8] g/100g ; Selenium = 26.2 [7.8, 96.5] μg/100g ; VitaminA = 1.78 [0.47, 7.81] μg/100g ; Zinc = 0.228 [0.106, 0.518] mg/100g (wet weight);