Shark Reproduction | SHARK ACADEMY

Shark Reproduction | SHARK ACADEMY


Are they born from eggs or live born? Or both?
How do sharks reproduce? I’m Jonathan Bird and this is shark academy! Unlike fish, which produce large amounts of
eggs, most of which never reach maturity, sharks produce far fewer, but larger, offspring,
and they have a much better chance of reaching adulthood. Sharks can reproduce in several ways. Many
small sharks, like the horn shark, the swell shark and cat sharks actually lay eggs on
the bottom. The baby shark develops in there, living off a yolk sac filled with nutrients.
The baby, a miniature version of its parents, is born after a few months to a year of gestation,
depending on water temperature and the species. Sharks using this reproductive strategy are
called oviparous. Meaning egg-laying. Other sharks are viviparous. They give birth
to live young which develop inside the mother shark, receiving nutrients and oxygen from
mom through an umbilical cord, just like humans. Larger sharks like Blue sharks, Bull sharks
and Hammerheads use this technique. The last group of sharks are ovoviparous,
(also known as Aplacental Yolk Sac Viviparous). In this system, the mother produces eggs like
the oviparous system, but instead of laying her eggs on the bottom, she carries them inside
her body until they hatch. When the babies pop out, you might think the shark was viviparous,
but the babies had no umbilical cord inside, they lived off a yolk sac. In the weird category, the Sand Tiger shark
has a strange variation on its ovoviviparous reproduction known as intrauterine cannibalism.
The mother produces up to 50 pups in each of two uteruses, but the first baby in each
uterus that reaches about 4″ long eats all its siblings! After 12 months of gestation,
the mother then gives birth to a pair of 3 foot long pups! Pups that are well fed! Because sharks put so much more time, effort
and energy into producing a viable offspring than bony fish do, they give birth to far
fewer pups. A whale shark produces the most pups of any shark—around 300 at a time—but
then again, mom is the size of a bus. The Thresher and Sand Tiger only produce two pups
at a time. The Blue shark can produce 135 at a time, which is a lot for a shark not
the size of a bus. Gestation is long too, averaging 9-12 months.
Baby Spiny Dogfish take 22 months—almost two years—for their young to develop. Most sharks take quite a while to become mature
enough to reproduce as well. Great Hammerheads take 9 years. Lemon and Bull sharks take 15
years. Spiny Dogfish? 20 years. So, between the small litters, a long gestation
period and long time to reach maturity, sharks just don’t reproduce very quickly. This
is the reason they are so vulnerable to overfishing. If you’re interested in sharks, there are
more than 30 Shark Academy episodes to watch! You can also join my underwater adventures
on Jonathan Bird’s Blue World! And don’t ever miss a new episode–subscribe
now!

100 thoughts on “Shark Reproduction | SHARK ACADEMY

  1. Well done. 聽A data rich segment with easy to understand graphic aids. 聽Both informative and entertaining.

  2. Hey Jonathan I'm just here to say how good of a job you are doing. You entertain people all around the world. You truly are a loving and caring guy for your fans! You are doing such a great job on your work.
    KEEP IT UP JONATHAN!!!!!!! 馃槃馃槂馃槃馃槂馃槂馃榾馃榾馃榾馃榾馃槂馃槂馃槂馃槃馃槃馃槃

    P.S will you do any meet ups? Like where all your fans can meet you?

  3. Hey, Jonathan. Can you make a video on the strangest hunting/defensive tricks in the ocean? The evolutionary arms race can easily rival any war stories involving humans.

  4. Is there a difference between aplacental vivipary and ovoviviparous? Also, are there any examples of marine invertebrates that reproduce in this way?

  5. Johnathan which one is more dangerous. Mako shark or Sand tiger shark can you reply Please

  6. luv ur vids! I originally only wanted to see a goliath grouper but got hooked on these other cool stuff lol

    subscribed

  7. Your vids r educating as it is entertaining. I always come to watch ur vids before I go to bed, documentaries makes me fall asleep too fast. I would hit that subscribe button for 50000 times but it won't make a different. From the bottom of my heart, I thank you mr bird and ur team for making awesome vids

  8. Hey Jonathan! Just a quick question: Are you gonna be able to do a video about Goblin sharks? If you haven't already that is.

  9. Dumb question: how do you get started in oceanography? I'm a video producer and would love to get into it.

  10. I LOVE your channel. Thank you for the awesome videos. I am learning a ton on these beautiful creatures. So tired of that dumb ass shark week purely聽portraying terror. Definitely subscribed.

  11. jonathan bird. hi I am seth I from sc I live in mccoll a town I am 9 years old and I am interested in the titanic and I was wondering if you could scuba dive to the wreck and do a episode for me cause. I love when you are scuba diving . and you are my hero plzp bye

  12. Shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark shark BREATH shark shark shark shark shark shark shark shark shark shark shark aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaannnnnnnnnnddddddddd

    SHAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAARK

  13. Vulnerable for fishing ? Approximately 100 million sharks are killed per year by humans, somehow those buggers are invincible against extinction.

  14. How do hammerheads reproduce if they cant stop swimming

    And how do they get to reproduce for wxample humans use the birds and the bees

  15. Hey, I got a news from my friends say that they heard about snake can give a lives bron and some of them can do this a both egg and life bron馃悕

  16. I have a Question in My Homework
    Its a Group of animal
    1.Birds
    2.sharks
    3.komodos
    4salamaneders
    A.Ovoviviparous
    B.viviparous
    C.oviparous
    BUT SHARKS ARE…

  17. The plain city pool has a shark mascot which the swimming team is called plain city sharks LOL

  18. Their reproductive strategies are great if the humans are not involve. Another great video. Thank you Jonathan.

  19. Jaws may have not been your average shark but maybe this is how those sequal sharks came to be
    Jaws 2 a son
    Jaws 3 a grandson
    Jaws 4 a great grandson
    Jaws 5 a great great grandson

  20. Hi jonhan it鈥檚 me Jaylyn I love your shark acmdey it is so awesome l love sharks 馃 your amazing keep going on Dentures

  21. Hunger Games: the embryonic version!!! It's TRUE!!!! I wonder if there are a brother & sister sand tiger shark pair called Katniss & Peeta???

  22. I will help sharks by getting a handsome male shark and a bueatiful female shark to mate and have kids

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