Elasmobranchii (sharks and rays) > Lamniformes
(Mackerel sharks) > Cetorhinidae
Etymology: Cetorhinus: Greek, ketos = a marine monster, whale + Greek, rhinos = nose (Ref. 45335); maximus: Named comes from the latin 'maximus' meaning largest (Ref. 6885).
Environment / Climate / Range
Marine; pelagic-oceanic; oceanodromous (Ref. 51243); depth range 0 - 2000 m (Ref. 26346), usually 0 - ? m (Ref. 55197). Temperate; 6°C - 24°C (Ref. 88171); 75°N - 58°S, 112°E - 42°E (Ref. 84930)
Length at first maturity / Size / Weight / Age
Maturity: Lm ?, range 500 - 980 cm
Max length : 900 cm TL male/unsexed; (Ref. 247); 980.0 cm TL (female); common length : 700 cm TL male/unsexed; (Ref. 6077); max. published weight: 4.0 t (Ref. 4645)
soft rays: 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.
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).
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).
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. 90363)
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 1.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Trophic Level (Ref. 69278
): 3.2 ±0.3 se; Based on diet studies.
Resilience (Ref. 69278
): Very Low, minimum population doubling time more than 14 years (Fec=1-2; Musick et al. 2000 (Ref. 36717
Vulnerability (Ref. 59153
): Very high vulnerability (86 of 100) .