Sharks

LB
by Lizzie Buresh1 view·Updated May 14, 2021
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  1. This presentation is about sharks that, due to either rarity
  2. or location.
  3. Not much is known about them, the first of which
  4. is the goblin shark.
  5. These sharks live in the midnight zone, a place so
  6. deep in the ocean that sunlight does not reach.
  7. This leaves the area in perpetual darkness because of this
  8. gap in depth, humans and goblin sharks don't interact much.
  9. They have been rarely photographed and even rarer filmed.
  10. They make use of what they do have in their
  11. dark environment though.
  12. For example, the goblin shark has a rostrum, which is
  13. the long protrusion above its mouth.
  14. These are full of ampules of lorenzini, their electoral receptors,
  15. which allow the gobbling shark to sense its prey from
  16. a very long distance.
  17. Unknown though.
  18. Is that exact distance?
  19. Because of these electro receptive sensors, the goblin shark can
  20. sense the electric signals from the It's praised brain to
  21. its muscles and water is an incredible conductor of electricity.
  22. These sensors also keep the goblin shark from hitting the
  23. sea floor, added bonus.
  24. Once the goblin shark is close to its prey, it
  25. shoots its draw out.
  26. Its jaw is not actually connected to its face and
  27. it can come outward very quickly.
  28. This is called a slingshot jaw because it mirrors how
  29. a slingshot works going out quickly and then coming back
  30. to arrest.
  31. Like when a slingshot is actually fired, The job can
  32. extend almost to the end of its rostrum, which is
  33. quite a feat.
  34. It is believed that the goblin shark does not immediately
  35. devour its prey.
  36. Instead, it pulls its prey into its mouth and shoes
  37. with teeth at the back of its throat.
  38. The goblin shark, it's not by any means the longest
  39. shark in the sea, but it's not something to take
  40. lightly. A goblin shark can grow from anywhere from 2
  41. to 8.8 m to 3.8 m, or about 9 to
  42. 12 ft long.
  43. It gives birth to live pups after a nine month
  44. period With around two pups in the litter, goblin sharks
  45. are all the vaporous.
  46. And while that is something that sounds like a scary
  47. word, don't be alarmed, it just means that the sharps
  48. pups feed on other fertilized eggs that don't grow into
  49. sharks. The other shark in this presentation Are the thresher
  50. sharks of which there are three.
  51. They are best known for the long upper lobe of
  52. their caudal fin fancy speak for their tail is really
  53. long. Okay, their tail actually comprises of a good portion
  54. of their body length.
  55. There are three species with such distinct characteristics.
  56. The pelagic thresher, It's the smallest of the three.
  57. The logic means of the open ocean, which is a
  58. good description of where these sharks are found.
  59. All thresher czar fished for recreation and for profit.
  60. And this typically results in the shark's death even if
  61. done quickly and carefully.
  62. The second of these thresher is is the common thresher.
  63. Despite the name, they're not actually that common.
  64. In fact, they are vulnerable to extinction right beside its
  65. other brethren.
  66. The sharks attacked by whipping their tails to stun their
  67. prey, which is typically school fish.
  68. Because we know of this behavior fishermen exploited using live
  69. bait. The fishermen put the bait in the water which
  70. attracts the shark.
  71. The shark fin whips its tail at the prey and
  72. gets caught on the hook, pressures have to move forward
  73. to breathe and because it's caught by its tail, it's
  74. pulled backwards which kills the thresher.
  75. The third of these species is the big eyed thresher.
  76. It has the largest everything.
  77. They have longer bodies and much longer and stronger tales
  78. A life expectancy of 9 to 50 years and of
  79. course big eyes.
  80. These thresholds are hunted specifically for of items mins in
  81. their liver and their skin can be made into leather.
  82. Can you imagine shark skin leather, pretty big aquatic game.
  83. However there fishing is heavily regulated and there are even
  84. fisheries for these sharks.
  85. And that is all I have to say on these
  86. goblin and thresher sharks.
  87. My work's used are presented here and here.