Broody squid carry their eggs in their arms

Discussion in 'Gonatidae' started by dub_doctor, Dec 14, 2005.

  1. dub_doctor

    dub_doctor Blue Ring Registered

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    This is from an article in the recent edition of New Scientist:

    Web: http://www.newscientist.com/article.ns?id=dn8462
     
  2. CapnNemo

    CapnNemo Vampyroteuthis Supporter

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  3. main_board

    main_board Vampyroteuthis Supporter

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    Wow! The videos from the New Scientist are absolutely fabulous! What an incredible discovery. This is certainly the age of the cephalopod!

    Cheers!
     
  4. um...

    um... Architeuthis Supporter

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    Yeah? I was busy trying to write a little summary of the article from Nature, along with stolen pictures and video. :mad:

    dub-doctor gets his revenge... :twisted:
     
  5. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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    Gonatus madokai also broods eggs

    Passed to us from John Bower - Hokkaido University

    A new study led by a group of Japanese scientists has identified a squid in northern Japan that broods its eggs


    Parental care of eggs or young is uncommon in invertebrates. This is true for most squids, but a new study published in The Biological Bulletin (www.biolbull.org/content/current; pages 259-262) shows that females of a species in northern Japan care for their spawned eggs by brooding them in their arms. Divers in northern Japan have observed this behavior annually in nearshore waters off the Shiretoko Peninsula since 1991, but the species has until now remained unidentified.

    The cover photo (www.biolbull.org/content/223/3.cover-expansion), taken off Rausu, Hokkaido, in May 2006 shows a female brooding a single-layer, sheet-like egg mass attached to its arm hooks. The small, oval eggs are visible within the dark, viscous material that formed the egg mass. The authors describe the brooding behavior and identify the species as Gonatus madokai (family Gonatidae), now the third squid species known to brood. They suggest that females might continue this behavior for several months, during which time they weaken, undergo gelatinous degeneration, and are presumably unable to feed.

    Why the females would devote so much time and energy to caring for the eggs remains a mystery, but brooding could increase offspring fitness by protecting the developing embryos from egg predators and hypoxia. Even less is known about the evolutionary origin of this behavior, but the authors suggest that more brooding squids await discovery in the deep sea, which could provide more clues to understanding this intriguing behavior.
     
  6. Tintenfisch

    Tintenfisch Architeuthis Staff Member Moderator

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    From Kat's Western Flyer Expedition

    OK, it's official. I'm stowing away on this ship and never leaving. This morning we saw a brooding Gonatus at 1600m, waving her inky egg sheet gently as she floated along. We got a very good look at her and were even able to zoom in on the eggs--we could see eye spots! These images are screen grabs from my little video camera, which was filming the live feed on screen, so they're not great quality, but you'll get the idea!





    See full expedition posts and photos here
     

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  7. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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    Video of gonatid haching

     
    GPO87 likes this.
  8. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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  9. GPO87

    GPO87 Sepia elegans Staff Member Moderator

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    So many good things came out of ceph week this year. I admit, I've seen both those photo's, but I don't think I've ever seen then with such clear resolution! Gonatus is really a stunning animal in its natural habitat.
     
  10. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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    Their ceph week was mostly rehash but done really well and included a few things I had not seen before.
     

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