When we swim in the ocean or waters around the world, we sometimes see transparent jellyfish. As one of the most common creatures in the ocean, jellyfish are a symbol of the sea. Today, we will reveal several characteristics of jellyfish.

1. Jellyfish are not fish

Jellyfish are invertebrates, fish are vertebrates, the two are completely different creatures, jellyfish are not fish. In contrast, the body structure of fish is more complex, and the body structure of jellyfish is relatively simple. Jellyfish do not have respiratory organs, and their breathing method is relatively special, and can only breathe through the cells of the ectoderm.

2. Jellyfish are full of water

The water content of the jellyfish body is 98%, and its food, digestion and excretion must be completed in water. Without water, the body of the jellyfish would be small and unsightly. If they are removed from the water, they die instantly. Even dead jellyfish can bite, and their sting is usually mild but can cause an itchy rash.

3. Some jellyfish can kill

The deadliest and most venomous marine creatures in the ocean are the box jellyfish, also known as the "sea stinger" and "sea wasp." In Australia, an average of one person is killed by box jellyfish each year. In other parts of the world, such as the Philippines, Indonesia and Thailand, box jellyfish can kill up to 100 people a year.

4. Jellyfish have a long history

Every ocean in the world has jellyfish. Jellyfish are the most mysterious creatures in the ocean. Their appearance can be traced back to 650 million years ago, which is earlier than dinosaurs. They are found in waters all over the world and there are more than 250 species. About 70 species of jellyfish can harm people, and scientists believe there may be as many as 300,000 species that have yet to be discovered.

With the gradual development of jellyfish breeding technology, various jellyfish have gradually appeared on the market. This good-looking and peculiar creature has attracted many interested people, and more and more people have started raising jellyfish at home. If you also want to keep jellyfish at home, let's take a look at what to prepare.

1. Professional jellyfish tank

A professional jellyfish tank is very important. The swimming ability of jellyfish is poor. It needs a special annular flow system and a complete set of filtration system. Otherwise, a series of problems such as poor water quality and jellyfish sinking will occur, and the jellyfish will not live for one or two months. Don't think about raising goldfish, fighting fish.

2. Food

Jellyfish also need to eat, and the food intake is not small, brine shrimp is the most commonly used bait. Therefore, we can buy brine shrimp eggs and incubate them for about 24 hours. It is recommended to feed freshly hatched shrimp. If you can't finish eating, just refrigerate the newly hatched shrimp at a low temperature. Other food such as small whitebait can also be eaten.

3. Other

In order to maintain the water quality stability, it is best to buy some mussel shells or special bacteria houses or fish tank bricks to allow nitrifying bacteria to thrive in the water, thereby preventing the water quality from being deteriorated by jellyfish feces and dead brine shrimp. Pollution affects the growth of jellyfish. You can buy a nitrite test paper for regular water testing.