Shark Buoyancy | SHARK ACADEMY

Shark Buoyancy | SHARK ACADEMY


You wouldn’t think that a shark tends to
sink, but it does, and that stinks. I’m Jonathan Bird and welcome to Shark Academy! Most bony fish have an organ called a swim
bladder that they use to adjust their buoyancy. By adjusting how much gas is in its swim bladder,
a fish can keep itself perfectly neutral so it doesn’t sink or float. Sharks have no swim bladder, so they tend
to be heavier than water and sink like a rock. Some sharks, like the Wobbegong, have dealt
with it by becoming bottom-dwellers. Other sharks, like Blue sharks, have evolved
very large pectoral fins to act as airplane wings. As the shark cruises gently through
the water, the fins provide lift to keep the shark aloft. Many sharks like the Basking shark have evolved
massive, oily livers. The oil is more buoyant than water, and helps offset some of the shark’s
density, to help keep the shark from sinking. A few sharks, like the Sand Tiger and the
Whale shark are known to gulp air at the surface. By putting some air in their stomachs, they
don’t sink quite so much. Not having a swim bladder gives sharks one
big advantage over bony fish—the ability to rapidly change depth without worrying without
bursting the swim bladder. If a bony fish ascends faster than it can remove gas from
the swim bladder, it will literally explode! Check out our other exciting Shark Academy
episodes to learn everything about sharks! You can also join my adventures exploring
the underwater world! Check out Jonathan Bird’s Blue World! And don’t forget to subscribe!

44 Replies to “Shark Buoyancy | SHARK ACADEMY”

  1. Hey Jonathan i like your adventure every vidoe like share I wish you were here in suadi arabia so we can go scuba diving i love scuba diving

  2. Sharks like the blue shark really need those fins–which is why the shark fin trade is especially cruel. Β They often get their fins chopped off & then dumped back into the water alive, where they sink to the bottom and die. Β Don't eat shark fin!

  3. The sea and sea creatures are so amazing. I would have to say they are more interesting in the way they've evolved, rather than land species. AH I'm really so excited to learn more about the sea in the future!

  4. +BlueWorldTV

    Jonathan it's my dream to meet you. Your the one who inspired me to be a marine biologist when I get older. I also have some questions for you.

    1. Who inspired you to be a marine biologist?
    2. What college did you go to?
    3. At what age did you get interested in marine life? (I was interested when I was just 6 years old)

    Please please please answer my questions

    This is for you…. πŸ•πŸ•πŸ•πŸͺπŸͺπŸͺπŸ°πŸ°πŸ°πŸ¬πŸŸπŸ πŸ³πŸ™πŸ‹πŸ‘

  5. I totally agree. Knowledge is key. Oh and by the way I have a huge fear of sharks and I was special forces. We seen amazing things, but I really would love to be around those rays attracted to light. Also it's awesome to tell everyone, observe but don't touch them. Your awesome brother!

  6. Considering that sharks sometimes need to very quickly grab a bite to eat on the surface I'd say they are incredibly well designed for what they do. (Sharks ambushing seals/birds, etc.. etc..) I'm sure they are also far more efficient divers then fish with swim bladders as well.

  7. I 100% can't wait to be a Marine Biologist!! πŸ˜€ I wanted to be a Marine Biologist ever since I was 6 I study then almost everyday!! I also watch your videos almost everyday too!!

  8. If there were a ton of Reef Sharks around and the fish exploded, the Sharks would be probably like, "Guys look! Free meal!"
    "WHOOOOOOOOOOOOOOO!"
    nom nom nom
    BURP!

  9. I loved this intro sooooooooooooo much "You wouldn't think that a shark tends to sink, but it does, and that stinks!"

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