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Basking shark


Cetorhinus maximus
(Gunnerus, 1765)

The Basking shark is the only member of the Cetorhinidae family. It is the second largest shark and fish in the world. It is normally observed at the surface where it feeds alone or in a group. The Basking shark is found near the coast in northern and temperate waters. In Eastern Canada, it ranges from Newfoundland in the north, to the St. Lawrence Estuary in the west.

Despite its huge size, the Basking shark poses no threat to humans. It feeds exclusively on plankton. Very little is known about its reproduction. In winter, it is believed to hibernate on the bottom after shedding its gill rakers. In fact, it is the only shark that passively filter feeds, relying solely on forward movement to capture plankton. The Basking shark appears in the Maritimes and the Gulf of St. Lawrence at the start of summer. Some have even been captured in the dead of winter by trawlers, which may be an indication that a certain number hibernate in the gulf.

Basking shark

Provisional map of basking shark distribution based on research by GEERG. Details on observations (other than year) will be released at a later date. Map does not include data from Europe or Mid-Atlantic. To submit additional observations or reports of sightings, please contact us at: info@geerg.ca

Scientific Name:
Cetorhinus maximus*
(Gunnerus, 1765)
*sea monster with a big nose

Common Names:
Basking shark
Elephant shark
Bone shark
Nurse fish
Sunfish
Sailfish
Hoe-mother

Squale pèlerin (Fr.)
Squale géant (Fr.)
Éléphant de mer (Fr.)
Poisson à voiles (Fr.)

Cetorhinus comes from the Greek words "ketos," meaning "sea monster", and "rhinos," meaning "nose". Maximus is latin for "great."

Maximum length: Up to 12m (40')
Average length: 6.5m to 9m (22' to 29')
Weight: Up to 4 500kg (9 900lbs)

The Basking shark is the second largest shark and fish in the world, measuring up to 12m in length.

Seen from the surface, the Basking shark often looks like a whale. It can even completely leap out of the water in order to rid itself of parasites. This rare occurence was reported in Percé Bay in July 2001.

Even if it only feeds on plankton, the Basking shark has hundreds of little teeth. When it opens its mouth, its head takes on gigantic proportions. Its liver is equal to 25% of its body weight and helps maintain the buoyancy of this enormous fish.

Basking shark off Perce, Quebec

Basking shark filter feeding on the surface near Percé, Québec (Gaspé Peninsula). Photo courtesy André Berthelot (All Rights Reserved)

The Basking shark feeds exclusively on planktonic organisms. It can filter up to 1,500,000 litres of water in one hour while swimming at 5 km/h.

VERIFIED STOMACH CONTENTS

Plankton : Copepods, crustaceans, fish eggs, larvae

VIDEO 1: Basking shark filter feeding off the Cornish Coast (UK).

The Basking shark is found in almost all of the worlds' oceans. Its American habitat extends from the North Atlantic off Newfoundland, to the South Atlantic. In Quebec, the Basking shark is found in the Gulf of St. Lawrence every summer and often ventures into the St. Lawrence Estuary.

Basking shark off Gascon, Quebec.

Basking shark filter feeding on the surface near Gascon, Québec (Gaspé Peninsula). Photo courtesy André Berthelot (All Rights Reserved)

The Basking shark appears along Canada's eastern coast at the start of summer and stays through the fall. A number of sharks may even hibernate at the bottom of the Gulf of St. Lawrence. It is frequently observed off the Gaspé Peninsula, especially in the Bay of Chaleurs.

Dead basking shark off Peggy's Cove

Dead basking shark off Peggy's Cove, Nova Scotia. Basking sharks are accidentally killed when they get get entangled in nets or other fishing devices.

This photo was taken in 1975, before the shark fin market had fully developed in the North Atlantic. Photo © GEERG (All Rights Reserved)

Status

COSEWIC

The Pacific population of the Basking shark is considered endangered by COSEWIC (Committee on the Status of Endangered Wildlife in Canada).

Basking shark - Cetorhinus maximus
Pacific population
Status: Endangered (2007)
Canadian Occurrence: Pacific Ocean
Status Criteria: A2a; C1

Click HERE to go to COSEWIC's web page on the Basking shark.

Benz, G W., Dippenaar, S M., 1998, Putting the Bite on Jaws: Copepods as Enemies of Sharks, Southeast Aquatic Research Institute.

Bigelow, H B., Schroeder, W C., 1953, FISHES OF THE GULF OF MAINE, United States Government Printing Office, Washington.

Borucinska, J. D., Benz G.W., Whiteley, H.E. 1988, Ocular lesions associated with attachment of the parasitic copepod Ommatokoita elongata (Grant) to corneas of Greenland sharks, Somniosus microcephalus (Bloch & Schneider), Journal of Fish Diseases ,21, 415-422.

Caloyianis N., Winter, 2000, Arctic Sharks - Adventures with the Greenland Shark, Ocean Realm.

Gallant J., Harvey-Clark C., Myers R.A., Stokesbury M.J.W., 2006, Sea lamprey (Petromyzon marinus) attached to a Greenland shark (Somniosus microcephalus) in the St. Lawrence Estuary, Canada, Northeastern Naturalist, 13, 35–38.

Harvey-Clark C., Gallant J , Batt J., 2005, Vision and its relationship to novel behaviour in St. Lawrence River Greenland Sharks (Somniosus microcephalus), The Canadian Field-Naturalist, Volume 119, Number 3. (July–Sept 2005).

Homer S., 1984, Jaws IV : Great white shark netted off Maritime tourist beaches, Equinox Magazine. 14, 127-128.

Lineaweaver, T., Backus, R.H. 1970, THE NATURAL HISTORY OF SHARKS, Ed Lyons & Burford.

Martin, R. Aidan., Wallace, Scott., Wallace, COSEWIC Assessment and Status Report on the White Shark Carcharodon carcharias in Canada, COSEWIC COMMITTEE ON THE STATUS OF ENDANGERED WILDLIFE IN CANADA, 2006

Martin, R. Aidan., 2003, Field Guide to the Great White Shark, ReefQuest Centre for Shark Research, Special Publication , 1, 1-185.

Martin, R. Aidan., 1995, SHARK SMART, ed Diving Naturalist Press, Vancouver.


Paccalet, Y., 2003, LA VIE SECRETE DES REQUINS, Ed l'Archipel, Paris.

Pranschke, J. L., 2000, The use of carbon and nitrogen isotope analyses for the determination of carbon source and trophic position of Somniosus microcephalus, Carleton University, Ottawa.

Ridoux V., Hall A.J., Steingrimsson G., Olafsson G., 1998, An Inadvertent Homing Experiment with a Young Ringed Seal, Phoca hispida, Marine Mammal Science, 14, 883-888.

Scott, W.B., Scott M.G., 1988, ATLANTIC FISHES OF CANADA, University of Toronto Press.

Stokesbury M.J.W., Harvey-Clark C., Gallant J., Block B.A., Myers R.A., 2005, Movement and environmental preferences of Greenland sharks (Somniosus microcephalus) electronically tagged in the St. Lawrence Estuary, Canada, Marine Biology.

Templeman, W., 1963, Distribution of Sharks in the Canadian Atlantic, Fisheries Research Board of the Atlantic, Ottawa.

Le naturaliste canadien, Déc. 1960. Université Laval

Les nouvelles du large, (Bulletin no. 7) - GREMM, 18.06.1999

Les nouvelles du large, (Bulletin no. 8) - GREMM, 24.06.1999


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info@geerg.ca

 

Version française

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