JellyFish Facts

Jellyfish Swarms

Jellyfish Swarms picture

Jellyfish Swarms

A lot of attention is being paid to jellyfish swarms since the recent past. A large number of jellyfish swarms have suddenly appeared in and around tourist and fishing destinations around the world. The number of jellyfish stings reported every year is rising dramatically, doubling and tripling in the case of some regions. On the other hand, jellyfish are destroying the fishing industry in a number of locations along the world's coastline by destroying fishing nets and poisoning the catch. Let's understand this phenomenon of increasing jellyfish swarms in the waters of the world.

Jellyfish are known to swim in swarms in natural conditions. This is because they do not have very specialized reproductive systems and the male jellyfish releases sperm in the water. For these sperms to fertilize, they need to come in contact with the female's eggs which are usually in her mouth or along her oral arms. To facilitate this process, jellyfish usually swim in close proximity to each other. Under favorable conditions, jellyfish swarms can get created very quickly.

There are numerous reasons provided for the increasing rise of jellyfish swarms. Extensive fishing causes reduction in the number of predators who feed on jellyfish. This gives them the natural impetus to multiply quickly. On the other hand, global rising has caused the water temperature near the coasts to go up. Jellyfish who live in temperate waters find this condition extremely favorable to reproduce. Additionally, global warming has resulted in reduced rainfall near coastlines. This causes increase in the salinity of water, which is another favorable factor for jellyfish reproduction. Also, gathering darkness in the waters due to human deposits hardly affect the life cycle of the jellyfish because they are not dependent on light to hunt for their food.

While depletion of oxygen in the water, which is also caused by global warming, causes numerous deaths in a variety of fish species, jellyfish thrive in these conditions. This is another reason for the influx of jellyfish near the coastlines of the world. One other aspect of jellyfish behavior has contributed to this increase in jellyfish swarms. When jellyfish feel threatened, they tend to release a number of polyps into the water. Under favorable conditions, these polyps will quickly develop into jellyfish and form new swarms.

It is important to remember that jellyfish do not attack human beings. They do not have a brain and cannot even control their movement. They float in the waters and get carried about in the tides and currents of the water. Their nerve receptacles not only sense, but also react to external stimuli and when they come in contact with any surface, like the human body, they naturally discharge venom through their tentacles or oral arms. The abundance of jellyfish in and near our coastlines is the impact of global warming and the jellyfish are just as much impacted as the human race. However, jellyfish have existed on the surface of the earth for more than 650 million years and is known to survive in damaged environments, and that is what it is doing right now.

Learn more about Jellyfish Stings and Jellyfish Safety

Learn more about Jellyfish, different Jellyfish Species, general Jellyfish Information, Jellyfish Pets and Jellyfish Safety

Written by and Sudarsana Sinha.

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