Huge Jellyfish Attacks: Nomura Jellyfish, The Giant Jelly of Japan

Nomura jellyfish has plagued the seas of Japan from 2005 up to the present. The unintentional attacks brought by this kind of creatures have severed the fishing industries of the affected regions in Japan as well as the balanced food chains in the seas.

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The creature is even bigger than the diver himself.

Cnidocysts are considerably the identifying character of this creature. These sac-like structures contain toxins and enzymes that poison their prey. Once the prey is paralyzed, the dead creature is sucked towards the jellyfish’s stomach called manubrium. In this area, the jellyfish sucks the nutrients of its prey via two pressuring canals in the underside of the umbrella – radial canals, and the umbrella margin or lappet – ring canal. By nature, jellyfish are carnivores feeding only on small planktons and fishes, and sometimes even on their kind.

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Nomura’s Jellyfish often disturbs the fishing industry by decreasing the number of small fishes, destroying the fishing nets and disrupting the natural food chain of the sea due to the over consumption of zooplanktons. Two several theories have been proposed explaining the rise of these sea monsters in the Japanese waters from 2005 up to present. First, the global warming is considered the principal cause of jellyfish migration from Chinese to Japanese waters. The temperature of the water makes Japanese seawater the ideal breeding place for their kind. Second, the amount of phosphorus and nitrogen in the Japanese seas are thought to increase the potency of the breeding process among these creatures.

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Fortunately, jellyfish lacks sensory organs, such as brain and internal organs, but they do possess rhopalia, which acts as the perfect alternative for the sensory nerves. Rhopalia is capable of perceiving stimuli enabling them to catch their prey through waves of water, light disturbances and odor. Nevertheless, Nomura jellyfish maybe considered harmless to humans themselves, but their overpopulation in the seas of Japan can cause a great deal of trouble not only in the fishing industries and the entire sea bodies of Japan.

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22 Responses to “Huge Jellyfish Attacks: Nomura Jellyfish, The Giant Jelly of Japan”
  1. ursula banteux Says...

    On September 18, 2008 at 10:44 am

    ghastly. absolutely ghastly. i hate jellyfish! great article, though.

  2. Moses Ingram Says...

    On September 18, 2008 at 2:00 pm

    Amazing! A great article.

  3. Melody Arcamo Lagrimas Says...

    On September 18, 2008 at 8:31 pm

    Remarkabe species – why do I think this jellyfish looks like a coconut?

  4. MAG Villaflor Says...

    On September 18, 2008 at 8:46 pm

    To be honest… I don’t have any idea why these look like a coconut. :) Probably because they look more like a big button mushrooms to me. hehehe :)

    Thanks for viewing

  5. MC caluya Says...

    On September 18, 2008 at 9:43 pm

    its looks like a coconut…. incredible..jelly fish:)

    keep it up

  6. thestickman Says...

    On September 19, 2008 at 7:23 am

    Eww! Jellyfish! I wonder what these fishermen are going to do with those in the net? Are the edible? They’re mostly water, but there might be some kind of soup or something once rendered down.
    Or, use them are soil fertilizer since “…the amount of phosphorus and nitrogen in the Japanese seas”. Phosphorus, -unsure about but nitrogen is needed in soil for some plant life.

    Kewl article.

  7. wb44 Says...

    On March 28, 2009 at 4:47 pm

    Good article, amazing jellies!!!

  8. Minkang Says...

    On April 12, 2009 at 10:48 am

    I am trying to find facts about NOmura jellyfish but this is really good facts.. Thank you..

  9. shasta Says...

    On May 1, 2009 at 8:28 pm

    i really needed the facts i love jellies:) thank u so much!

  10. Shub-Niggurath Says...

    On August 23, 2009 at 11:45 pm

    The Old Ones are coming!

  11. lloorr11 Says...

    On October 19, 2009 at 6:16 pm

    AweSOmE AnD StRaNgE –yet TRUE!

  12. Tia Says...

    On November 16, 2009 at 1:14 pm

    Oh wow, Jellies, up close and personal. Wouldn’t want to fall into something like that.

  13. Charlie Sommers Says...

    On January 19, 2010 at 12:18 pm

    I don\’t know about this particular species but some jellies are edible. I used to buy them dried at a local Asian market in Nashville Tennessee and make a salad with them. The jellies themselves have little flavor but add a quite nice crispy texture to the salad. Not a very nutritious critter as a 2 oz. serving has only 3 grams of protein but enough sodium to supply your requirements for two and a half days.

  14. Kasie Says...

    On January 30, 2010 at 8:37 pm

    want something even better go to this link

  15. lilly Says...

    On March 25, 2010 at 12:11 pm

    fake fake and one more thing umm FAKE to fake see ya

  16. Allie Hayashi Says...

    On June 7, 2010 at 1:55 pm

    Nice article, esp their breeding might be due to global warming aspects.

  17. josh h Says...

    On September 15, 2010 at 11:38 am


  18. josh h Says...

    On September 15, 2010 at 11:40 am


  19. Bioboy Says...

    On December 30, 2010 at 12:21 am

    I look at these jellyfish and see a source of carbon neutral energy.

    Simple anaerobic digesters could convert the jellyfish to methane, which can then be used for heating and/or electricty production. The by-products would be a nitrogen rich solution suitable for crop fertilization, and a relatively small amount of fishbones and plastic from the jellyfish’s stomachs. The harvesting systems are already in place (the fishermen and their boats).

    So the fishermen win (even if they overfish the Nomura the species fit for human consumption would then rebound).

    The local environment and biodiversity wins.

    The Japanese economy wins from starting a new industry providing new jobs, less reliance on imported fuel, and less greenhouse gas emissions.

    And of course with less greenhouse emissions, every living thing on the planet wins, with the exception perhaps of the Nomura jellyfish.


  20. ahmad fauji Says...

    On January 6, 2011 at 10:21 pm

    keren banget…….. tapi kalau anda ke pulau kakaban, berau kalimantan timur indonesia. jauh lebih keren… ubur2 tidak menyengat..

  21. Kris Guen Says...

    On January 20, 2011 at 1:07 am

    I heard that there have been many recent problems with these jellyfishes. There have been a few, bad incidents where the jellyfish tips over the fishing trawler.

    Thanks for posting, by the way. I needed some information on this species.

    It’s nearly impossible to kill them, too. If they feel threatened or if they’re killed, they disperse millions of sperms and eggs, then they attach themselves to corals and rocks. Once they’re ready, they hatch.

  22. ari Says...

    On March 10, 2012 at 9:49 am

    Maybe Nomura Jellyfish are eatable if they dried like chip, and fried after that.

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