Distribution and habitat | whale shark galapagos

Distribution and habitat | whale shark galapagos

Distribution and habitat

 

The whale shark inhabits almost all tropical and warm-temperate seas. The fish is largely pelagic, living in the open sea but not in the higher depths of the ocean, though it is known to occasionally dive to depths of as much as 1, 800 metres (5, 900 ft).|17| Periodic feeding aggregations occur at several coastal sites such as the southern and eastern parts of South Africa; Saint Helena Tropical isle in the South Atlantic Water; Gulf of Tadjoura in Djibouti, Gladden Spit in Belize; Ningaloo Reef in Western Australia; Kerala|18|, Lakshadweep, Gulf of Kutch and Saurashtra coast of Gujarat in India;|19| Útila in Honduras; Southern Leyte; Donsol, Pasacao and Batangas in the Israel; off Isla Mujeres and Isla Holbox in Yucatan and Bahía de los Ángeles in Baja California, México; Maamigili island, Maldives; Ujung Kulon National Park in Indonesia; Cenderawasih Bay Country wide Park in Nabire, Papua, Indonesia; Flores Island, Philippines; Nosy Be in Madagascar; off Tofo Beach near Inhambane in Mozambique; the Tanzanian islands of Mafia, Pemba, Zanzibar; Gulf of Tadjoura in Djibouti, the Advertisement Dimaniyat Islands in the Gulf of Oman and Ing Hallaniyat islands in the Arabian Sea; and, very rarely, Eilat, Israel and Aqaba, Test. Although typically seen overseas, it has been found closer to property, entering lagoons or coral reefs atolls, and near the jaws of estuaries and waters. Its range is generally restricted to about 30° latitude. It really is capable of diving to depths of at least 1, 286 m (4, 219 ft),|20| and is migratory.|9| On 7 February 2012, a large whale shark was found floating 150 kilometres (93 mi) off the seacoast of Karachi, Pakistan. The length of the specimen was considered to be between 11 and doze m (36 and 39 ft), with a weight of around 15, 000 kilogram (33, 000 lb).|21|

 

 

In 2011, more than 400 whale sharks gathered off the Yucatan Coast. It was one of the greatest gatherings of whale sharks recorded.|22| Aggregations in that area are being among the most reliable seasonal gatherings reputed for whale sharks, with huge numbers occurring in most years among May and September. Associated ecotourism has grown rapidly to unsustainable levels.|23|

Neither of them mating nor pupping of whale sharks has been noticed.

 

The capture of a woman in July 1996 that was pregnant with three hundred pups indicated whale sharks are ovoviviparous.|9||24||25| The eggs remain in the body and the females give birth to live fresh which are 40 to sixty cm (16 to twenty four in) long. Evidence indicates the pups are not all of the born at once, but rather the female retains sperm from one mating and produces a steady stream of pups over a continuous period.|26| They will reach sexual maturity at around 30 years and their life-span is an estimated 70|9| to 100 years.|27|

 

On 7 March 2009, marine scientists in the Korea discovered what is believed to be the smallest living specimen of the whale shark. The young shark, measuring only 38 cm (15 in), was located with its tail tied to a stake at a beach front in Pilar, Sorsogon, Israel, and was released into the outrageous. Based on this discovery, some scientists no longer believe this area is just a feeding ground; this site may be a birthing earth, as well. Both young whale sharks and pregnant females have been seen in the waters of Saint Helena in the South Atlantic Ocean, exactly where numerous whale sharks may be spotted during the summer.

The whale shark is a filtration feeder - one of only three known filter-feeding shark species (along with the basking shark and the megamouth shark). It feeds on plankton including copepods, krill, fish eggs, Christmas Island crimson crab larvae |30| and small nektonic life, such as small squid or fish. It also provides nourishment to on clouds of eggs during mass spawning of fish and corals.|31| The many rows of vestigial teeth play no position in feeding. Feeding arises either by ram filtration, in which the animal opens their mouth and swims forward, pushing water and foodstuff into the mouth, or by productive suction feeding, in which the animal opens and closes its mouth, sucking in volumes of water that are after that expelled through the gills. In both cases, the filtration pads serve to separate food from water. These exceptional, black sieve-like structures are presumed to be modified gill rakers. Food separation in whale sharks is by cross-flow filtration, in which the water vacations nearly parallel to the filtration system pad surface, not perpendicularly through it, before driving to the outside, while denser food particles continue to the back of the throat.|32| That is an extremely efficient filtration approach that minimizes fouling of the filter pad surface. Whale sharks have been observed "coughing", presumably to clear a build-up of particles from the filter pads. Whale sharks move to feed and possibly to breed.

2019-02-02 16:00:44 * 2019-02-02 14:01:43