Habitat Whale Shark | whale shark giving birth
Distribution and habitat
The whale shark inhabits all of the tropical and warm-temperate oceans. The fish is mostly pelagic, living in the open sea but not in the increased depths of the ocean, though it is known to occasionally dive to depths of as much as you, 800 metres (5, nine hundred ft).|17| Seasonal feeding aggregations occur at several coastal sites such as the southern and eastern portions of South Africa; Saint Helena Isle in the South Atlantic Ocean; 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 Thailand; 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 specific 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 Advertising Dimaniyat Islands in the Gulf of Oman and Way Hallaniyat islands in the Arabian Sea; and, very rarely, Eilat, Israel and Aqaba, Michael jordan. Although typically seen just offshore, it has been found closer to area, entering lagoons or coral atolls, and near the mouths of estuaries and streams. Its range is generally limited 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 kms (93 mi) off the coastline of Karachi, Pakistan. The size of the specimen was considered to be between 11 and 12 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 fishes recorded.|22| Aggregations in that area are among the most reliable seasonal gatherings known for whale sharks, with thousands and thousands occurring in most years among May and September. Connected ecotourism has grown rapidly to unsustainable levels.|23|
Not mating nor pupping of whale sharks has been noticed.
The capture of a female in July 1996 that was pregnant with 300 pups indicated whale fishes are ovoviviparous.|9||24||25| The ovum remain in the body and the females give birth to live small which are 40 to 70 cm (16 to 24 in) long. Evidence shows the pups are not all born at once, but rather women retains sperm from one pairing and produces a steady stream of pups over a prolonged period.|26| That they reach sexual maturity in around 30 years and their life expectancy is an estimated 70|9| to 100 years.|27|
On 7 March 2009, marine scientists in the Thailand discovered what is believed to be the tiniest living specimen of the whale shark. The young shark, measuring only 38 cm (15 in), was identified with its tail tied to a stake at a seashore in Pilar, Sorsogon, Thailand, and was released into the untamed. Based on this discovery, a few scientists no longer believe this place is just a feeding ground; this site may be a birthing place, as well. Both young whale sharks and pregnant females have been seen in the oceans of Saint Helena in the South Atlantic Ocean, where numerous whale sharks could be spotted during the summer.
The whale shark is a filtration system feeder - one of just 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 purple crab larvae |30| and small nektonic life, such as small squid or fish. It also feeds on clouds of ovum during mass spawning of fish and corals.|31| The many rows of vestigial teeth play no purpose in feeding. Feeding comes about either by ram filtering, in which the animal opens it is mouth and swims frontward, pushing water and food into the mouth, or by lively suction feeding, in which the pet opens and closes their mouth, sucking in volumes of prints of water that are then simply expelled through the gills. In both cases, the filtration system pads serve to separate food from water. These one of a kind, 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 travels nearly parallel to the filter pad surface, not perpendicularly through it, before transferring to the outside, while denser food particles continue to the back with the throat.|32| This is certainly an extremely efficient filtration technique 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 reproduce.
2019-01-24 13:41:29 * 2019-01-24 01:42:54
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