Vicious Beauties: The Secret World of the Jellyfish

2010, Nature  -   7 Comments
Storyline

At the mere mention of the name 'jellyfish' most of us imagine shapeless, rubbery and even disgusting creatures. In any case there's something we do not wish to touch. It isn't until we see them under water that they transform into graceful beings. In the course of evolution jellyfish have developed unbelievably clever skills and have conquered every habitat in our oceans.

To protect themselves they've developed weapons that can also become dangerous to humans. Most jellyfish are not a threaten species. Among the large family of jellyfish, the 'Box jellyfish' is the most dangerous, closely followed by the Siphonophorae - the Portuguese man o' war. For most of us the word 'jellyfish' evokes negative feelings. The term 'medusa' is more appropriate and it gives a feeling of mysterious and dangerous beauty.

In this documentary Dr. Gerhard Jarms will be introducing us to the unusual life-cycle of these animals. In reality jellyfish are smooth, soft and what is even more interesting their history goes back 500 million years. During this time they have developed the most fascinating shapes and most interesting lifestyles. They live both in the deep sea and on the coastline.

If we ignore for a moment the massive influxes of medusae on the coasts of the North Sea and Baltic Sea from time to time, the oceans are not necessarily packed with medusae, even some images make it look that way. Where do medusae come from? How and where do they reproduce? The life-cycle of jellyfish or medusae is characterized by a shift from one generation to the next and by a change between the sessile and the free swimming states.

The gelatinous animals consist of 98% water. The life-cycle of a medusa can be from one to thirty years depending on the species. During this time they can grow up to 200 times their initial size.

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Ratings: 8.76/10from 143 users.

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7 Comments / User Reviews

  1. Adri

    Love it. I sailed crossing the Atlantic and we can see a lot of this beauty, and never get tired to see these beautiful creatures

  2. Jacek Walker

    A good watch.
    I got an impression that the jellyfish must have a quite comfortable life floating smoothly efforlessly up and down and throughout oceans.
    No backaches, broken bones, bruises etc.
    Or maybe I just imagine...

  3. Alessandra Martellacci

    So soothing and I learned a lot too. Now I have a lot of reading to do on jellyfish. Fascinating!

  4. tvdog

    Nice relaxing show for an evening.

  5. dmxi

    great doc to a great & fascinating life-form....which leaves the human mind boggled by it's life-cycle.

  6. Imightberiding

    I've always been fascinated by all things ocean & its exploration. Thanks for this one.

  7. Fabien L

    Very informative, great HD video imagery.