How does a jellyfish reproduce? Detailed answer

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How does a jellyfish reproduce? Detailed answer

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How does a jellyfish reproduce?

One of the world's most common species of jellyfish is the moon jellyfish. A long, milky-colored fringe hangs from her round, like a bowl, body. On the upper side of an adult jellyfish there is a pink or orange plate, in the form of a four-pointed clover leaf. These four ends are the reproduction organ. In the male jellyfish, sperm cells are produced in them, which exit through the mouth of the animal into the water. In the female, this organ produces eggs. The eggs remain in the body until the moment of fertilization, that is, the connection with the sperm cells in the water. The eggs develop in long, floating folds hanging from the mouth.

When the eggs are laid, they sink to the bottom of the ocean. They do not look like adult jellyfish, but turn into polyps. Young polyps catch food with tentacles and grow for several months. Then something strange happens. Grooves appear on polyps. Gradually, polyps begin to resemble a cracked saucer. One by one, pieces of this "saucer" begin to move away and float away. Each such "piece" becomes an adult jellyfish.

The way of life and reproduction of jellyfish is debugged very well. It has evolved over more than 600 years. Jellyfish are among the most ancient forms of life on Earth and have changed little over this time. Jellyfish are not fish. All fish are vertebrates. Jellyfish don't have a backbone. Their body resembles a bag with jelly and a hole inside.

Author: Likum A.

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Jellyfish as fertilizer 06.11.2018

The unsalted and dried remains of jellyfish is an organic fertilizer that increases the nutrient content of the soil and also reduces the growth of weeds.

This conclusion was reached by Japanese scientists who began to use jellyfish fertilizer in rice fields. This use was found by jellyfish after they flooded the surrounding waters, interfering with fishing.

Moreover, this problem is relevant not only for Japan. The FAO report says that the rapid growth of the jellyfish population has become one of the possible reasons for the depletion of fish stocks in the Mediterranean and Black Seas. Jellyfish eat a large number of eggs and fry of fish, and overfishing leads to a further reduction in fish populations.

The use of jellyfish as a raw material for the production of organic fertilizers can reduce the population of jellyfish. To do this, jellyfish are crushed, desalinated and dried. Then they are applied to the soil before planting.

As a result, the field is saturated with nitrogen (12-13%) and the growth of weeds is suppressed. For example, in Japan, the yield of rice was the same as with the use of chemical fertilizers.

In fact, raw materials for the manufacture of such fertilizers are also available in Ukraine. In the fall of 2017, the beaches of Odessa were filled with large koreneroti jellyfish. This year, a large number of giants were observed on the Zaporozhye and Kherson coasts of the Sea of Azov. Jellyfish were not only in the water, but along the entire coast.

Experts note that jellyfish are a unique resource for the south. They can be caught and sold in Asian countries where jellyfish are eaten. And it can be processed into fertilizers. In addition, jellyfish fertilizers retain moisture well in the soil, which is a limiting factor for the southern regions.

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