whale shark

 

large, plankton-eating shark, Rhincodon typus, found in all tropical seas of the world. The largest known specimens are 50 ft (15 m) long, making them the largest fish in the world. The whale shark feeds largely on plankton, as well as on small fish and crustaceans. It is the only large shark with its mouth at the front of its head rather than on the underside. The mouth is equipped with many rows of tiny teeth, and the throat has numerous long slender structures called gill rakers, which form a fine mesh for straining food from the water. The whale shark's body is stout but streamlined, like that of a whale. It is dark brown above, with many white or yellow spots, and white or yellow below. The whale shark is a docile, torpid fish; it does not attack, even on provocation, but has been known to collide with boats. It is classified in the phylum Chordata, subphylum Vertebrata, class Chondrichthyes, order Selachii, family Rhincodontidae.

Whale shark
Whale shark from Taiwan in the Georgia Aquarium Size comparison against an average human
Conservation status
Vulnerable (IUCN) [1]
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Chondrichthyes Subclass: Elasmobranchii Order: Orectolobiformes Family: Rhincodontidae (Müller and Henle, 1839) Genus: Rhincodon Smith, 1829 Species: R. typus
Binomial name
Rhincodon typus (Smith, 1828)
Range of whale shark

The whale shark, Rhincodon typus, is a slow filter feeding shark that is the largest living fish species. This distinctively-marked shark is the only member of its genus Rhincodon and its family, Rhincodontidae (called Rhinodontes before 1984), which is grouped into the subclass Elasmobranchii in the class Chondrichthyes. The shark is found in tropical and warm oceans and lives in the open sea. The species is believed to have originated about 60 million years ago.^[2]

Naming

The species was first identified in April 1828 following the harpooning of a  metre ( ft) specimen in Table Bay, South Africa. It was described the following year by Andrew Smith, a military doctor associated with British troops stationed in Cape Town. He proceeded to publish a more detailed description of the species in 1849. The name "whale shark" comes from the fish's physiology; that is, a shark as large as a whale that shares a similar filter feeder eating mode.

Distribution and habitat

The whale shark inhabits the world's tropical and warm-temperate oceans. While thought to be primarily pelagic, seasonal feeding aggregations of the sharks occur at several coastal sites such as Ningaloo Reef in Western Australia; Útila in Honduras; Donsol and Batangas in the Philippines; and the Tanzanian islands of Pemba and Zanzibar. Though it is often seen offshore, it has also been found closer to shore, entering lagoons or coral atolls, and near the mouths of estuaries and rivers. Its range is restricted to about ±30 ° latitude. It is found to a depth of  metres ( ft)^[3]. The whale shark is solitary and rarely seen in groups unless feeding at locations with an abundance of food. Males range over longer distances than females (which appear to favour specific locations).

Anatomy and appearance

As a filter feeder, it has a capacious mouth which can be up to  metres ( ft) wide and can contain between 300–350 rows of tiny teeth.^[4] It has five large pairs of gills. Two small eyes are located towards the front of the shark's wide, flat head. The body is mostly grey with a white belly; three prominent ridges run along each side of the animal and the skin is marked with a "checkerboard" of pale yellow spots and stripes. These spots are unique to each whale shark and because of this they can be used to identify each animal and hence make an accurate population count. Its skin can be up to  centimetres ( in) thick. The shark has a pair each of dorsal fins and pectoral fins. A juvenile whale shark's tail has a larger upper fin than lower fin while the adult tail becomes semi-lunate (or crescent-shaped). The whale shark's spiracles are just behind the eyes

The whale shark is not an efficient swimmer since the entire body is used for swimming, which is unusual for fish and contributes to an average speed of only around  kilometres per hour ( mph). The largest specimen regarded as accurately recorded was caught on November 11, 1947, near the island of Baba, not far from Karachi, Pakistan. It was  metres ( ft) long, weighed more than 21.5 tonnes (47,300 lb), and had a girth of  metres ( ft).^[5] Stories exist of vastly larger specimens—quoted lengths of  metres ( ft) are not uncommon in the popular shark literature—but no scientific records exist to support their existence. In 1868 the Irish natural scientist E. Perceval Wright spent time in the Seychelles, during which he managed to obtain several small whale shark specimens, but claimed to have observed specimens in excess of  metres ( ft), and tells of reports of specimens surpassing  metres ( ft).

In a 1925 publication, Hugh M. Smith describes a huge whale shark caught in a bamboo fish trap in Thailand in 1919. The shark was too heavy to pull ashore, but Smith estimated that the shark was at least  metres ( ft) long, and weighed approximately 37 tonnes (81,500 lb), which have been exaggerated to an accurate measurement of  metres ( ft) and weight 43 tonnes in recent years. There have even been claims of whale sharks of up to  metres ( ft). In 1934 a ship named the Maurguani came across a whale shark in the Southern Pacific ocean, rammed it, and the shark consequently became stuck on the prow of the ship, supposedly with  metres ( ft) on one side and  metres ( ft) on the other.^[6] No reliable documentation exists of those claims and they remain little more than "fish-stories".

On August 25, 2007, Antonio Moreano, a qualified naturalist diving with a group of tourists, photographed an albino whale shark at Darwin (Culpepper), the Galápagos Islands.

Diet

The whale shark is a filter feeder—one of only three known filter feeding shark species (along with the basking shark and the megamouth shark). It feeds on phytoplankton, macro-algae, plankton, krill and small nektonic life, such as small squid or vertebrates. The many rows of teeth play no role in feeding; in fact, they are reduced in size in the whale shark. Instead, the shark sucks in a mouthful of water, closes its mouth and expels the water through its gills. During the slight delay between closing the mouth and opening the gill flaps, plankton is trapped against the dermal denticles which line its gill plates and pharynx. This fine sieve-like apparatus, which is a unique modification of the gill rakers, prevents the passage of anything but fluid out through the gills (anything above 2 to 3 mm in diameter is trapped). Any material caught in the filter between the gill bars is swallowed. Whale sharks have been observed "coughing" and it is presumed that this is a method of clearing a build up of food particles in the gill rakers.^[3][7][8]

Whale sharks congregate at reefs off the Belizean Caribbean coast, supplementing their ordinary diet by feeding on the roe of giant cubera snappers, which spawn in these waters between the full and quarter moons of May, June, and July.

The whale shark is an active feeder and targets concentrations of plankton or fish by olfactory cues. Rather than simply "vacuuming" constantly, it is able to pump water over its gills. The shark can circulate water at a rate up to 1.7 L/s (3.5 U.S. pint/s).^{[citation needed]} The whale shark does not need to swim forward when feeding; it is often observed in a vertical position, "bobbing" up and down swallowing water and actively filtering it for food. This is in contrast to the basking shark, which is a passive feeder and does not pump water; it relies on its swimming to force water over its gills.^[7][3]

Behaviour towards divers

This species, despite its enormous size, does not pose any significant danger to humans. It is a frequently cited example when educating the public about the popular misconceptions of all sharks as "man-eaters". They are actually quite gentle and can be playful with divers. There are unconfirmed reports of sharks laying still, upside down on the surface to allow divers to scrape parasites and other organisms from their bellys. Divers and snorkellers can swim with this giant fish without any risk apart from unintentionally being hit by the shark's large tail fin.

The shark is often seen by divers in The Bay Islands in Honduras, Thailand, the Maldives, the Red Sea, Western Australia (Ningaloo Reef), Gladden Spit Marine Reserve in Belize, Tofo Beach in Mozambique, Sodwana Bay (Greater St. Lucia Wetland Park) in South Africa and at the Galapagos Islands.

The highest concentration of whale sharks to be found anywhere in the world is in the Philippines. From January to May, they congregate in the shallow coastal waters of Sorsogon province (at Donsol). Lucky divers have also come across whale sharks in the Seychelles and in Puerto Rico. Between December and September, they are well known to swim along the bay of La Paz in Mexico's Baja California. Sometimes, they are accompanied by smaller fish, in particular, the remora. Recently, they have been seen in the vicinity of Tenggol Island, off the east coast of West Malaysia.^{[citation needed]}

Reproduction

The reproductive habits of the whale shark are obscure. Based on the study of a single egg recovered off the coast of Mexico in 1956, it was believed to be oviparous, but the capture of a female in July 1996 which was pregnant with 300 pups indicates that they are ovoviviparous.^[3][9] The eggs remain in the body and the females give birth to live young which are  centimetres ( in) to  centimetres ( in) long. It is believed that they reach sexual maturity at around 30 years and the life span has been estimated to be between 70 and 180 years.^{[citation needed]}

Conservation status

The whale shark is targeted by artisanal and commercial fisheries in several areas where they seasonally aggregate. The population is unknown and the species is considered vulnerable by the IUCN.^[1] All fishing, selling, importing and exporting of whale sharks for commercial purposes has been banned in the Philippines in 1998 ^[10], followed by Taiwan in May 2007 ^[11].

Whale sharks in captivity

A whale shark is featured as the main attraction of Osaka Aquarium Kaiyukan and as of 2005, three whale sharks are being studied in captivity at the Okinawa Churaumi Aquarium in Japan. Four whale sharks, two males, Taroko, and Yushan,^[12] and two females, Alice and Trixie, are held in the Georgia Aquarium, in Atlanta. Two male whale sharks, Ralph and Norton, died in captivity at the Georgia Aquarium on January 11, 2007 and June 13, 2007 respectively.^[13] The two males were added on June 3, 2006 in hopes that reproduction in whale sharks could be studied in captivity. All six whale sharks were imported from Taiwan, where whale sharks are dubbed as Tofu sharks because of the taste and texture of the flesh.

See also

• List of sharks

References

General references

External links

• Reporting a whale shark sighting
• How to photograph a whale shark for mark-recapture research
• Whale Shark Research Discussion Forum
• Whale Shark Research in Utila, Honduras
• / A short film about Utilas Whale Sharks
• Whale Shark research in Mozambique
• Whale shark, Rhincodon typus MarineBio"
• ECOCEAN Whale Shark Photo-identification Library
• Whale Shark Project
• Whale sharks
• TimeAsia.com: Best of Asia, Best Animal Encounter
• Whale Shark profile and whale sharks in Belize from The Nature Conservancy
• Diving with whale sharks
• Diving with whale sharks in Belize at Gladden Split
• Albino whale shark photographed in Galapagos

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