write an essay on jelly fish over population
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For 500 million years, jellyfish have been part of the maritime ecosystem, but now they’re poised to take over the earth.
They have no brain, no eyes, no spine, not even blood, but they have a remarkable capacity to reproduce and can pack an impressive sting, both literally and figuratively.
Most recently, vast numbers of bluebottle jellyfish were pushed ashore by unusually strong winds and spells of hot weather in Queensland, Australia, stinging thousands of people and forcing the closure of popular swimming spots. About 13,000 stings were recorded in the past week.
In June last year, over the course of just one week, over 1,000 people were stung in Volusia County, Florida, following a period of exceptionally prolific jellyfish blooms. The explosion in their numbers has been attributed to warming seas and even increased pollution; unlike many other marine creatures, jellyfish can cope with reduced oxygen levels.
Small but deadly – at least some of the time
Typically, jellyfish range in size from 1cm to 40cm. But they can be significantly larger – the Lion’s Mane Jellyfish, for example, can reach 1.8 metres wide, with tentacles over 15 metres long.For the most part, the sting of a jellyfish is more unpleasant than it is harmful. The pain comes from venom delivered via millions of microscopic barbs in the creatures’ tentacles. Most jellyfish stings will only have a localized effect on the victim – redness, swelling, and discomfort where the barbs make contact with the skin.
Some, however, will prompt a systemic, whole body, reaction. These may take several hours to emerge and can include symptoms such as headaches, nausea and drowsiness.
In rare cases, the sting can be fatal. This is true of the box jellyfish, which is spreading into waters that had previously been too cool to support it; its venom causes a severe reaction that can cause death within minutes.