Jellyfish

Jellyfish are important planktonic organisms in aquatic environments, including hydrozoans, scyphozoans, cubozoans, and staurozoans. The body of a jellyfish resembles a transparent umbrella, with the diameter of the umbrella varying in size. The diameter of a large jellyfish's umbrella can reach 2 meters, and the edge of the umbrella also has some filamentous tentacles, some of which can reach lengths of 20-30 meters. The main component of a jellyfish's body is water, composed of two layers of embryonic tissue, with a thick layer of mesoglea in between, which provides buoyancy. Jellyfish all have the same ability to prey and defend themselves, which is that their tentacles are parasitized by many stinging cells. The stinging cells contain a cnidocyst, which stores venom and is coiled with stinging filaments. When stimulated by external factors, the cnidocyst can be everted and the stinging filaments can be shot out like a spear or whip, along with the venom. This is also the process by which it harms fish or the human body.

Whether it is tropical waters, temperate waters, shallow areas, oceans about a hundred meters deep, or even freshwater areas, they all have their traces. Jellyfish have existed as early as 650 million years ago, even earlier than dinosaurs. There are more than 250 species of jellyfish in the world, distributed in waters around the globe. They all live in the ocean.

1. The umbrella-shaped body becomes pale and perforated.

The umbrella-shaped body of the jellyfish appears pale and patchy. As the cultivation time increases, the pale area expands continuously. In severe cases, the umbrella-shaped body becomes perforated and extensive ulceration occurs, affecting the observation of the jellyfish and even causing death.

2. The umbrella-shaped body flips.

The umbrella-shaped body of the jellyfish flips, severely affecting its observation. With the increase of cultivation time, the degree of flipping gradually intensifies, accompanied by the shrinking of the umbrella-shaped body. Jellyfish with complete body flipping can still feed normally, but the shrinking of the umbrella-shaped body ultimately leads to the death of the jellyfish.

3. The umbrella-shaped body protrudes into a spherical shape.

A spherical protrusion forms in the middle of the jellyfish's umbrella-shaped body. With the increase of cultivation time, the degree of protrusion slowly intensifies, but it does not affect the jellyfish's daily swimming and feeding, which impacts the observation value of the jellyfish.

4. Tipping over and unable to maintain balance.

The jellyfish cannot maintain a normal swimming posture in the water and tips over, unable to maintain balance. If not treated in time, it can easily form air bubbles, affecting the observation of the jellyfish.

5. Tentacle entanglement.

The long tentacles of the jellyfish are part of its observation. In the cultivation tank, the long tentacles often become entangled with each other. Under normal circumstances, the jellyfish can untangle itself. When the entanglement is severe, the tentacles become knotted, causing the tentacles to break, which affects the movement and observation of the jellyfish.

6. The umbrella-shaped body becomes flat and has poor swimming ability.

Part of the jellyfish's umbrella-shaped body becomes flat, the tentacles lack contraction strength, and it has poor swimming ability, affecting the movement and observation of the jellyfish.

Jellyfish are marine organisms, so they must be bred in seawater. The water needs to be changed every week or so to prevent dust and microorganisms from blocking the jellyfish and fish from receiving energy, affecting their mobility. Be careful not to touch the jellyfish when changing the water. Do not pour water too quickly. Jellyfish have high food requirements, and brine shrimp, copepods, and other planktonic organisms are their favorites. When the digestive organs and oral cavity in the jellyfish's wings turn orange, it means that the jellyfish is full. The feeding frequency and quantity should be well controlled, not too much, as it can cause water quality to deteriorate. An aquarium should also be equipped with a thermostat to maintain the water temperature at around 25 degrees Celsius, otherwise their "survival" will be compromised.