Jellyfishes. What they are and what are dangerous by?
For the first time I got acquainted with these unusual beings when I was 8 years old. We had a rest in the Crimea, in Yevpatoria. There was a June, there was unusual even for the Crimea a heat, and the sea at the coast teemed with jellyfishes. Almost transparent, similar to jelly, they somehow absolutely powerlessly waved on waves and were absolutely harmless.
I took them in hand, considered, played with these strange beings - without everyone for myself harm. Then I learned that jellyfishes are not harmless at all that they are able to sting painfully, and some of their types in general are deadly. I will tell honestly: first I could not even believe in it...
There passed years, and I moved to live to Israel - to coast of the Mediterranean and Red seas. Here I happened to get acquainted with these creatures closer. In Israel nearly an every season there are troubles connected with invasion of jellyfishes. Some beaches close for bathing. There are also victims. Personally I, fortunately, meanwhile did not suffer from jellyfishes in any way so this note is not based on personal impressions. Perhaps, its reliability from it limps a little, but I think that it is not such a big payment for the kept health.
What beings such - of a jellyfish are? From biology we know that they treat group of coelenterates. That is, roughly speaking, represent a bag with an opening which serves both for meal, and for removal from an organism of waste products. Besides, as well as other coelenterates, they have special strekatelny cages.
These cages - very terrible weapon! At a touch the long stinging threads which pierce in a body of the victim are thrown out of them. These threads contain poison.
In the world there are more than two hundred species of jellyfishes. Is among them both rather harmless, and deadly. So, for example, the meeting with the jellyfish living at coast of Israel threatens with generally “local“ consequences. That is, a burn, as from a nettle, only much stronger. The place of a burn will swell up and will hurt, but as a rule, all troubles on it and come to an end. However there are among these creatures also real murderers.
At coast of northern Australia the jellyfish with an unusual name - a sea wasp lives . In a form she reminds a wasp a little - rather, is similar to a bell with a fringe. But the virulence this rather small (the size approximately about a basketball) the jellyfish can argue with the whole hornet`s nest: it is enough one dose of its poison to kill 60 people! A grief to the one who will meet a sea wasp: the place of a burn instantly swells and begins to hurt awfully. Sharply temperature jumps up, heart failure, and without rendering the timely help quickly develops, the death can occur within several minutes!
But even not the sea wasp is the most dangerous inhabitant of the Australian seas. Small - of the size of a nail - the jellyfish of an irukandzha possesses the poison which is not conceding on force to poison of a sea wasp. Its sting is almost imperceptible, but approximately in 20 minutes after it at the person the most severe heart attack which quite often leads to death develops. Worst of all, that jellyfishes of an irukandzha from - for the small sizes are almost imperceptible in water and easily get through the protecting networks calculated on their larger relatives.
And why the Crimean jellyfishes were so harmless what I without any damage to health held them in hand? On this question I to these do not know the answer. Some species of jellyfishes really do not do to the person serious harm. Besides, business was in June, and the Crimean jellyfishes only in August “ripen“. So explained to me. It is not sure that this explanation is right, but if I am mistaken - let readers will correct me.
And the last. What to do if you all - were stung by a jellyfish? First of all immediately rinse the place of a burn with salty water . Not fresh: it can make active the strekatelny cages which remained on skin. Then wash out a wound vinegar and scrape off the remains of feelers a knife . Then it is very desirable to see a doctor.
But it is the best of all - not to meet jellyfishes at all!