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What is the elemental composition of a jellyfish?

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Categories: Animals.

Tags: Biology, jellyfish, marinebiology.

 

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What was happening to these jellyfish?

Alright, another strange Jellyfish question. This occurred in Viareggio, again in Italy, durring the early summer of last year. I was swimming in the sea, in which at first I did not see a single jellyfish, when all at once I was swimming in what was something like two parts jellyfish to one part water, if you get my drift. I know that now sudden blooms of medusae in the Mediterranean have been becoming common, but here's where it gets a little weird: every last one of them were dead, and their tentacles missing. What could have caused this? At first the only explaination I could think up was that perhaps they die after breeding, and that their tentacles had been chewed off. Which, nonetheless, makes little sense to me. And seeing that a creature whose body is 97% water decays quite rapidly as it is, I wouldn't think that their tentacles just happened to rot away first. I supposed it's worth noting that, although varying in size, all of the dead jellyfish were of the same species. All other types of jellyfish I saw that day in the area were alive and intact. Any ideas?

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Categories: Animals.

Tags: environment, globalwarming, sea, death, jellyfish, mediterranean, dead.

 

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What is the name of this jellyfish?

I was in Isola d'Elba, an island off the coast of Tuscany, early last spring durring an enormous jellyfish bloom. At about mid-afternoon, before which the waters had been essentially clear of jellyfish, the area became completely swarmed all in about a period of twenty minutes. It consisted almost entirely of one species, which were obviously a type of comb jelly but whose description does not match anything I have been able to find on the net. They looked like Mnemiopsis, but were pinkish-orange in color (and relatively opaque), about twenty centimeters in length, and were covered in conicle, spike-like protrusions.

Among these were also a few individuals of a couple other species I have not been able to find information on. These include a type that was the exact size, color, and shape of a chicken egg, and another which was flat and resembled an elongated, outstretched pair of wings with a span of about 160 cm.

All of the species I have listed above were bioluminescent, emerged at the same time, dissolved easily to the touch, and did not sting (these being traits of jellyfish that live in the abyss, which therefore should not have been in shallow water to begin with). Unfortunately, I did not have a camera at the time and thusly can only describe them as best I can, but any information you might have on them would surely put my curiosity at ease.

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Last edited on: 2010-03-09 14:16:38

Categories: Animals.

Tags: environment, sea, jellyfish, mediterranean, bloom, deep.

 

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Jellyfish or other creature?

I noticed this creature floating near the recreational pier at Rocky Point Park, in Port Moody, BC. It appeared to swim by curving/swinging its body side-to-side, as if it were a tail, and appeared to be similar in size to the fist of a child. There were a number of jellyfish in the waters at the same time, and at first, I assumed it was a type of jellyfish. Can anyone identify this creature?

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  • Asked by galeao
  • on 2009-11-06 20:33:18
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Last edited on: 2009-11-06 22:02:29

Categories: Animals.

Tags: sea, jellyfish, creature.

 

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