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Sea Cucumbers | BLUE WORLD ACADEMY

August 23, 2019


Today on Blue World Academy, Sea cucumbers! Virtually everyone is familiar with the sea
star, an animal which is a member of the phylum of invertebrates known as Echinoderms, meaning
“spiny skin.” Other Echinoderms include the sea urchins
and the feather stars. The sea cucumber is another echinoderm—hard
to believe since most of them don’t have very spiny skin at all. But the sea cucumbers are most closely related
to sea urchins! There are over 1700 species of sea cucumbers
in the world’s oceans, and it’s not hard to guess how they got their name. Most are about the size and shape of a large
cucumber. But the similarity to a vegetable ends there! Sea cucumbers have tiny tube feet like sea
stars and sea urchins. They can move around, albeit somewhat slowly. There are two basic ways in which sea cucumbers
feed. The plankton-feeders extend feathery tentacles
into the water as a net for passing plankton. The sticky tentacles gather up particles,
then one by one, the sea cucumber licks the plankton off each tentacle with a centrally-located
mouth. In the rich waters of New England, an Orange-footed
sea cucumber feeds on plankton soup. If I tickle its tentacles, the sea cucumber
withdraws them for protection. Other species of sea cucumbers feed by digging
though the sediments on the sea floor looking for decaying particles. They typically eat a bunch of sand in the
process, which passes completely through their digestive tract. It’s a slow process, but seen in a time
lapse, a Tiger tail sea cucumber covers a lot of ground looking for food. You might think that an animal like this would
be defenseless, but in fact many sea cucumbers possess a fascinating defense mechanism. When threatened, they can eject a sticky goop
called cuvierian tubules to ensnare predators. Others can expel poisonous chemicals to drive
predators away. As a result, very few animals will dare to
attack sea cucumbers. Due to that general lack of predators, sea
cucumbers make a safe home for symbiotic partners. An Emperor shrimp lives in safety on a sea
cucumber and in exchange for the protection, keeps its host free of parasites. But of course, there are a few predators that
can handle the sea cucumber’s defenses. In the north Pacific, Giant Sun stars will
attack and eat sea cucumbers. And in the south pacific, a large snail known
as a Partridge Tun specializes in eating sea cucumbers using a powerful venom to subdue
its victim. The Echinoderms are a diverse and interesting
group of animals, with the sea cucumber as its strangest and possibly most fascinating
member.

53 Comments

  • Reply IDiveDeep September 30, 2016 at 11:11 am

    Lovely video. I'm going to the Maldives in 2 weeks I'm gonna try look and maybe make a symbiotic documentary from my point of view:) I'm really inspired by u;) keep on the great work and thanks for all the knowledge.

  • Reply Dougie.Fresh September 30, 2016 at 11:25 am

    Hi Jonathan you're my favorite YouTuber it would make my day if you responded

  • Reply Bone Shrimp September 30, 2016 at 11:28 am

    Yay finally!!!

  • Reply Blubahub September 30, 2016 at 11:33 am

    Please Do More!

  • Reply Moto Shark September 30, 2016 at 11:39 am

    That snail was weird looking. Looked like it was sucking the life out of that cucumber. Nice vid!
    + ๐Ÿ‘

  • Reply Fetchdafish September 30, 2016 at 11:39 am

    Strangely adorable until they cough their lungs out all over you.

  • Reply Branden Mcphaden September 30, 2016 at 11:47 am

    U should dive at Georgian bay on wreck island

  • Reply LeoChong September 30, 2016 at 12:03 pm

    I've Never Been This Early In My Life

  • Reply Karl_Kokosboll September 30, 2016 at 12:32 pm

    I love this chanel jonathan please respond to me dont need to be anything big i just want you to see me you are the one that inspier me to scuba dive ๐Ÿ™‚ :D๐Ÿ˜Š

  • Reply Wespa64 September 30, 2016 at 1:33 pm

    this made me hungry

  • Reply Mr. Freshman September 30, 2016 at 6:05 pm

    Johnathan when will you see blue whales??

  • Reply oumo lhassanain September 30, 2016 at 7:17 pm

    Hi mister Jonathan i love sae world and your channel

  • Reply Fletcher Rammell September 30, 2016 at 7:44 pm

    Jonathan please replay and keep up the fantastic vids

  • Reply glizz ward102 September 30, 2016 at 9:51 pm

    hi Jonathan I really injoy your videos and I subscribed and I liked all your videos I hope you respond cause I would make my day

  • Reply Hanya Hage September 30, 2016 at 10:17 pm

    another great vid :3 thanks for entertaining us

  • Reply Brooke Horvath September 30, 2016 at 10:58 pm

    Hi Jonathan, i have been wondering this question for a long time. How did you know you wanted to make videos about the ocean

  • Reply Power Surge October 1, 2016 at 3:39 am

    No one takes better footage of the sea than you guys!

  • Reply xuemei lu October 1, 2016 at 3:50 am

    Was this sent out in 2016?

  • Reply Benny ray Rillmann October 1, 2016 at 11:15 am

    Hi Jonathan,

    I love your videos and i get most if my knowledge about sea life from your videos.
    But for school i gotta make a presentation about the " Red Snapper".
    But i can't find enough information about them. Cold you make a video about the red snapper please?

  • Reply Ryan Kang October 1, 2016 at 2:39 pm

    simply amazing…

  • Reply Tom Sharpe October 1, 2016 at 4:19 pm

    Does anyone find it ironic that his last name is bird and dives??

  • Reply Andre Pesci October 1, 2016 at 8:08 pm

    great video!

  • Reply Gregor D October 2, 2016 at 2:00 am

    love your videos. I've learned a lot. plz respond!

  • Reply Elliotic October 2, 2016 at 4:36 pm

    Awesome video! Do you have any collabs planned? I think it'd be awesome to see you work with another youtuber

  • Reply IKnowPlaces 13 October 2, 2016 at 7:18 pm

    You are my favorite channel to watch

  • Reply Connor Morfee October 3, 2016 at 1:29 am

    I love sea creachers๐Ÿณ๐Ÿข๐Ÿฌ๐ŸŸ๐Ÿ ๐Ÿฆ‚๐Ÿฆ€๐Ÿ™

  • Reply Myggan October 3, 2016 at 5:01 pm

    Have you ever seen a sunfish? And if not, can you try to make a video on that?

  • Reply Philosoraptor October 3, 2016 at 7:40 pm

    I wish i could of had these kind of oppertunitys, but to do this for work? Jonathan you are one lucky man

  • Reply charly charly October 6, 2016 at 8:41 pm

    I love this channel, so uplifting

  • Reply Hofmann Rudolf October 9, 2016 at 6:55 am

    It's that a cone snail???๐Ÿ˜ณ๐Ÿ˜ณ๐Ÿ˜ณ

  • Reply Emma Hinton October 10, 2016 at 2:49 am

    I always thought that a sea cucumbers were real cucumbers. Know a lot more thing about ocean wild life from this chanle. You are awesome!

  • Reply Mr. Spiff October 28, 2016 at 2:09 pm

    Best most fitting song I've ever heard starts playing in the background at 2:00

  • Reply Puspa Yadav December 12, 2016 at 4:28 pm

    ๐Ÿณ๐Ÿ‹๐ŸŸ๐Ÿ ๐Ÿก๐Ÿก๐Ÿ™๐Ÿš

  • Reply Puspa Yadav December 12, 2016 at 4:38 pm

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  • Reply samhita sagar February 6, 2017 at 12:31 pm

    I wish I can dive with you but I am only 6๐Ÿ˜ฉ

  • Reply Claire 670 March 1, 2017 at 9:06 am

    ๐ŸŽถ

  • Reply Matthew Romano April 20, 2017 at 12:45 am

    Very educational! I had no idea sea cucumbers farts sounded like human farts!

  • Reply elis21zyl O May 10, 2017 at 9:10 pm

    Great video!

  • Reply Angeles_JG_KM May 12, 2017 at 12:48 am

    sea cucumbers I last saw are in the Philippines because I live here

  • Reply Pokรฉmon Trainer July 2, 2017 at 3:14 pm

    I guesst love your videos and the great fotig that you can get!

  • Reply Forest Alias July 9, 2017 at 9:35 am

    I respect all lifeforms but damn these are gross

  • Reply chantelle venter July 13, 2017 at 10:39 pm

    this show is awesome!

  • Reply Megan Lynn August 16, 2017 at 12:56 am

    355th like 64th comment lol love your videos.

  • Reply ZeBanshee August 21, 2017 at 3:29 pm

    So should i get an Emperor shrimp to go along with my sea cucumber?

  • Reply Cooper the Maltese/CockerSpaniel Dog breed September 18, 2017 at 11:08 am

    Omg almost 200K subs! Jonathon can you reply me thanks cause i sub! And can you sub me ?

  • Reply Cooper the Maltese/CockerSpaniel Dog breed September 18, 2017 at 11:08 am

    And im first in commets

  • Reply Amina Mouna November 28, 2017 at 6:25 am

    I LOVE THIS CHANNEL

  • Reply Kaj Suwanvalaikorn December 11, 2017 at 11:03 am

    When I was at the beach and went snorkeling I found a creature that looked like a sea cucumber and I swim as fast as a human bullet because I was terrified.

  • Reply Sahiti v February 17, 2018 at 9:17 am

    Do all sea cucumbers live in murky water and can they see

  • Reply Santhosh Illa October 19, 2018 at 12:27 pm

    3:38 I think this should be named as the elephant snail.

  • Reply JBC March 4, 2019 at 9:44 pm

    0:44 look on the right who saw a sea urchin walking

  • Reply JBC March 4, 2019 at 9:48 pm

    1:58 that's the cucumber is so smart and knows how to hide from tickling

  • Reply Walaa Sami March 5, 2019 at 11:31 pm

    I'd mistaken the tiger-tailed sea-cucumber for a worm๐Ÿ˜ฒ

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