Tag Archives: jelly fish

Beached jellyfish

The unseasonably stormy weather has driven hundreds of jellyfish on to the beaches near Newborough. On a stormy tide, the jellyfish are at the mercy of the current, and once they’re beached, they have no way of getting back into the sea again. Hence the strandline of jelly.


Amongst the seaweed and on the sands where the tide is going out, hundreds of jellyfish are stranded

Jellyfish washed ashore at Penrhos beach

Jellyfish washed ashore at Penrhos beach

The “moon” jellyfish seem to be the most numerous this time. They are recognisable by the four bluey-violet horseshoe shapes inside the jelly.

Moon jellyfish - Aurelia aurita

Moon jellyfish – Aurelia aurita

Although these jellyfish are dead or dying and only have a mild sting when they’re alive, it is best not to touch them with bare skin.

Jellyfish “blooms” are becoming more frequent throughout the world. Some scientists think that they pose a threat to fish stocks (through competition and through predation on fish eggs and larvae) and that more work needs to be done to understand and control jellyfish numbers.

There is one jellyfish which is known as the “immortal” jellyfish because it can reverse its ageing process. Scientists think that there may be great potential for all kinds of pharmaceuticals to be developed from jellyfish. For more on the threats and potential benefits of jellyfish, see this FAO article.



Jellyfish and jelly blobs…

One of the nicest things about the beach is that it changes all the time and every tide brings new things to see.

Last year, for the first time, I found a jelly blob. Clearly “jelly blob” is not the proper
term for it, but it does describe what it was like. A small (about 2cm across) blob of
clear jelly with jade coloured strands in it. I found out, via the Natural History Museum‘s
website, that it was actually an egg mass of the green leaf worm (Eulalia viridis). I have
kept looking, but so far I haven’t seen the adult worms.

A Jelly Blob - aka the egg mass of the green leaf worm (Eulalia viridis)

A Jelly Blob – aka the egg mass of the green leaf worm (Eulalia viridis)

At the other extreme, was this Lion’s Mane jellyfish that washed up on Traeth Penrhos. Funnily enough, another name for this is sea blubber.

Lion's mane jelly fish on Penrhos beach (and a size 5 foot)

Lion’s mane (Cyanea capillata) jelly fish on Penrhos beach (and a size 5 foot)