Bigeye Thresher Shark - Tail Whip Hunter скачать в хорошем качестве

Bigeye Thresher Shark - Tail Whip Hunter

Hi, welcome to Enchiridion. I am feeling great to share with you these facts on the Bigeye Thresher Shark! The Bigeye Thresher Shark is a species of thresher shark part of the family Alopiidae found in temperate and tropical oceans worldwide. Like other thresher sharks, nearly half its total length consists of the elongated upper lobe of the tail fin. The average adult length of the Bigeye Thresher is between 11 and 13 feet, or 3.3 and 4 meters, or 335 and 400 centimeters, with a maximum reported size of 16 feet, or 4.9 meters, or 488 centimeters. The average adult Bigeye Thresher weight is around 350 pounds, or 160 kilograms, with a maximum recorded weight of 759.8 pounds, or 363.8 kilograms. It is distinguished by its large eyes which are directed upward, a head with deep grooves along the top, a caudal, or tail fin that is sickle-shaped with an extremely long upper lobe, and its first dorsal fin, which originates well behind the free tips of the pectoral fins. It exhibits countershading with the dorsal surface, having a purplish gray to brownish gray color with metallic hues, while its ventral side is a solid, pale, cream color. The large eyes of the Bigeye Thresher are adapted for hunting in low light conditions. It is one of the few sharks that conduct a diel vertical migration, staying in deep water during the day and moving into surface waters at night to feed. To protect its sensitive brain and eyes from the temperature changes accompanying these movements, the Bigeye Thresher has a vascular exchange system called the rete mirabile around those organs. They also have the rare ability to increase their body temperatures above that of the surrounding seawater. This can be observed in the head area, with individuals possibly warming blood around their sensory organs so they can continue to hunt for prey in the colder depths of the sea. This species feeds mainly on fish and squid, which are stunned via whip-like strikes of the long tail. The estimated average lifespan of a Bigeye Thresher is roughly 20 years. The Bigeye Thresher has a virtually circumtropical distribution. It is found in warm, temperate and tropical oceanic and coastal waters from the surface to depths of 500 feet, or 152.3 meters. Its common name comes from its enormous eyes, which are placed in keyhole-shaped sockets that allow them to be rotated upward. The eyes of the Bigeye Thresher can measure up to 3.9 inches, or 10 centimeters across in adults. This species can also be distinguished by a pair of deep grooves on the top of its head, from which its scientific name is derived. Bigeye Threshers are ovoviviparous, usually bearing litters of two pups. The embryos are oophagous and feed on ova produced by the mother while inside the uterus. The Bigeye Thresher belongs to the Kingdom Animalia, the Phylum Chordata, the Class Chondrichthyes, the Order Lamniformes, the Family Alopiidae, the Genus Alopias, and the Species Alopias superciliosus. This shark is caught by commercial fisheries across its range; the meat is not highly regarded but the skin, fins, and liver oil are valued. It has been assessed as Vulnerable by the International Union for Conservation of Nature (IUCN). Their major threats are gillnets and longlines set by Illegal, Unregulated and Unreported (IUU) fisheries on the high seas. Their extremely low fecundity, just 2 pups born per litter, leads to a low annual population increase rate, making them susceptible to significant population declines. And with that, thank you for joining me in this episode of The Aquarium Shorts. As always, thank you so much for watching! This is Enchiridion, see you next time. #Enchiridion #TheAquarium #BigeyeThresherShark #Sharks Table of Contents: 0:00 - Introduction 0:22 - Size 0:39 - Weight 0:53 - Description 1:18 - Lifestyle 1:58 - Diet 2:05 - Lifespan 2:10 - Habitat and Range 2:23 - Naming 2:45 - Reproduction 2:57 - Scientific Classification 3:12 - Relation to humans 3:21 - Conservation status 3:46 - Outro _____ Sources: “Alopias Superciliosus.” Florida Museum, 4 Apr. 2018, www.floridamuseum.ufl.edu/discover-fish/species-profiles/alopias-superciliosus/. “Bigeye Thresher Shark - Alopias Superciliosus.” Shark Research Institute, www.sharks.org/bigeye-thresher-shark-alopias-superciliosus. “Bigeye Thresher Shark.” EDGE of Existence, 4 Dec. 2018, www.edgeofexistence.org/species/bigeye-thresher-shark/. “Bigeye Thresher.” Wikipedia, Wikimedia Foundation, 3 Mar. 2021, en.wikipedia.org/wiki/Bigeye_thresher. “Sharks.” Alopias Superciliosus | Sharks, 12 Feb. 2016, www.cms.int/sharks/en/species/alopias-superciliosus. “Species Profile: The Bigeye Thresher Shark.” We Love Sharks!, 18 Jan. 2021, welovesharks.club/species-profile-the-bigeye-thresher-shark/.