Deutsche Seiten  
 Home  Preservation  Information  Foundation  Projects  Exhibit *  Database  Galleries  Links  Shark Info 
 * Search   Distribution   Phylogenetic Tree   Orders   Red List   Endangered Sharks  Sitemap  Sitemap 

 Basking shark (Cetorhinus maximus)

  Index
> Photo
> Range Map
> Systematics
> Name
> Appearance
> Coloration
> Distribution
> Biology
> Feeding
> Size
> Reproduction
> Similar Species
> Endangerment
> Danger to Humans

 Photo

Basking shark
© Jeremy Stafford Deitsch
 Range Map

Earth Map


 Systematics

Phylum: Vertebates (Chordata)

Class: Carlilagenous Fishes (Chondrichthyes)
  Order: Mackerel sharks (Lamniformes)
    Family: Basking sharks (Cetorhinidae)
      Genus: Cetorhinus (Cetorhinus)


 Name

Scientific: Cetorhinus maximus
German: Riesenhai
English: Basking shark
French: Pelerin
Spanish: Pelerino


 Appearance

Very long, cylindrically shaped (fusiform) trunk. Very pointed snout, with a large, subterminal mouth. Big eyes. Extremely large gill slits that nearly extend ventrally and dorsally around the head. First dorsal fin large, erect and triangular. Its origin is well behind the free ends of the pectoral fins. Second dorsal fin much smaller than first one. Lunate caudal fin with depressed caudal peduncle and strong lateral keels.

 Coloration

Nearly black.

 Distribution

Wide ranging in temperate and cold (subpolar) seas. Western Atlantic: New Foundland to Florida, southern Brazil and Argentina. Eastern Atlantic: Iceland, Norway, North Sea. Mediterranean. South Africa. Western Pacific: Japan, Korea, China, Australia (New South Wales, Victoria, Western Australia), Tasmania, New Zealand. Eastern Pacific: Gulf of Alaska to Gulf of California, Ecuador, Peru, Chile.

 Biology

Basking sharks live over the continental shelves in pelagic but not oceanic waters. Highly migratory, with seasonal appearances in certain localities and subsequent disappearances. Can be found alone and in aggregations (up to 100 animals). Basking sharks are probably the original subject of the "sea monster" stories since they prefer to swim directly under the water surface (plankton feeders) with their dorsal and caudal fin penetrating the surface, and sometimes follow each other. Basking sharks are passive feeders and do not actively suck in water as does the . They are able to filter about 2000 tons of water per hour. Gill rakers are shed on a yearly basis and then said to hibernate (although proof is still lacking) in deeper water. Basking sharks are nearly positively buoyant due to their large livers (up to 25% of their total weight) that are filled with certain oils (squalene).

 Feeding

Plankton.

 Size

Maximum total length about 1200 cm, average size between 900 cm and 1000 cm. Rarely caught under 300 cm (smallest animal ever caught was 170 cm).

 Reproduction

Aplacental viviparous (ovoviviparous). Probably with an uterine cannibalism (ooph. Size at birth unknown (probably around the 170 cm mark). Unknown litter size. Pregnant females are hardly caught. Males seem to reach sexual maturity between a size of 400 cm to 500 cm.

 Similar Species

None.

 Endangerment

Status in the IUCN Red List(1994):

Main criterion: > VU (Vulnerable)
Sub criterion: A1ad A2d
Trend: Unknown


 Danger to Humans

Harmless.



 ^  Top |  Home  Preservation  Information  Foundation  Projects  Exhibit *  Database  Galleries  Links  Shark Info 
© 2017 - 2017 Shark Foundation / Hai-Stiftung Last updated: 16/06/04 20:13 / Webmaster