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Thread: Box jellyfish/Portuguese man-of-war

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  1. #1
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    Default Box jellyfish/Portuguese man-of-war

    A recent thread about beaches on Oahu leads to a mention of Portuguese man-of-war which they and the Box jellyfish tend to wash up on south Oahu shores 10 days after a full moon (which was last night). Granted it took a while for someone to figure out that they do (washing up on shore) this every 28 or 29 days but has anyone figured out where they hang out the other days?

    Also has any other island experience this as well? I don't remember anything like this has happened on Kauai when I was growing up in the 1970's.

  2. #2
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    Default Re: Box jellyfish/Portuguese man-of-war

    Quote Originally Posted by helen
    A recent thread about beaches on Oahu leads to a mention of Portuguese man-of-war which they and the Box jellyfish tend to wash up on south Oahu shores 10 days after a full moon (which was last night).
    I'm 99.999% sure that it's only box jellies which do that, and not PMOW's. PMOW's are driven solely by the wind, which is why they're mostly seen on our windward shores.
    Box jellies don't like bright sunlight, so the when they're here each month they're close to the beach nearest sunrise and sunset, and during midday hours they head to deeper water.
    It was a Waikiki lifeguard, as I recall, who figured out their monthly pattern. The area seems to be increasing, too. Used to be just Hanauma Bay to Pokai Bay, but for the past year or so they've also started monthly appearances on the north shore.

  3. #3
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    Default Re: Box jellyfish/Portuguese man-of-war

    Since this post is pretty old, I would like to ask, have the sighting of Box Jellyfish increased?

    As far as I know, the Box Jellyfish are very dangerous and I am assuming this has been causing some stir up when they are found.

  4. #4
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    Default Re: Box jellyfish/Portuguese man-of-war

    I could be wrong on this, but I think the box jellies you are thinking of are showing up in Australia. These are a different variety than in HI. Not that the ones that show up here don't sting, but they aren't deadly like the ones in Australia. And some people are more susceptable to the sting of any jellyfish than others.

    There are also some micro-organisms that show up occasionaly that you should be aware of - especially if you have an open wound. I believe they carry (?) the vibro bacteria similar to the sea urchins. I don't know if anyone has noticed a pattern with that. Does anyone else know?

  5. #5
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    Default Re: Box jellyfish/Portuguese man-of-war

    Box jellyfish are not to be taken lightly. They pose the same dangers as the ones at Australia. They DO sting and can cause some prety serious health conditions.

    Irukandji jellies are even more nasty, but stick mainly to the north west waters of Australia.
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  6. #6
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    Default Re: Box jellyfish/Portuguese man-of-war

    Quote Originally Posted by TATTRAT View Post
    Box jellyfish are not to be taken lightly. They pose the same dangers as the ones at Australia.
    Actually, no they don't. AcousticLady was right in saying that our BJ are indeed different than the ones in Australia. The only chance of a fatality here would be the extremely rare case of an individual having a specific allergic reaction.

    .
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    That's my story, and I'm sticking to it.

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