The jellyfish is a symbol of the sea, but this animal appears to be somewhat weak. As the most common species in the sea, the jellyfish must have something to offer if it can continue to reproduce tenaciously today.

Jellyfish have been around for 650 million years, surviving five mass extinctions on Earth, and are still very common in the oceans. Most jellyfish have a very short lifespan, with the closest jellyfish to our lives being the jellyfish, whose skin is often eaten for its refreshing taste.

This jellyfish can live for about a year. As a primitive mollusc, a jellyfish's life is divided into two stages: a hydroid body that is fixed in one location, before it becomes a jellyfish that can swim around.

This transformation is almost irreversible, similar to the transformation of a tadpole into a frog. However, there is a species of jellyfish known as the lighthouse jellyfish that can change back into a hydroid, making it almost "immortal". It is not known if the lighthouse jellyfish has a memory.

There are currently around 250 species of jellyfish in the world, and this creature, whose body is composed of more than 95% water, has adapted to the changing environment of the Earth. The majority of jellyfish contain toxins in their bodies, which they use for hunting and defence.

They use stinging cells on their tentacles to inject toxins into their prey, thus paralyzing them. Jellyfish have toxins of varying strengths, the most well-known being the box jellyfish, which has the strongest toxins of any species known to man and is almost impossible to resist.

Jellyfish are beautiful aquatic creatures, looking as graceful as a transparent umbrella. When groups of jellyfish gather together, it creates a stunningly beautiful sight.

How to raise jellyfish

1. Seawater farming.

Jellyfish are marine creatures, so they must be cultured in seawater. You should change the water every week or so to avoid dirt and microorganisms blocking the jellyfish and fish from receiving energy and affecting their movement speed. When changing the water, be careful not to touch the jellyfish. Don't be in a hurry when adding water, but be slow.

2. Feeding.

Jellyfish have high food requirements. Plankton such as brine worms and fungus shrimp (please refer to other experiences for fungus shrimp breeding) are their favourites.

When you find that the digestive apparatus and mouth in the jellyfish's wing turn orange, it means that the jellyfish have eaten enough. The number of feeding times its portion should be controlled well, not too much because it will lead to easy deterioration of water quality.

2. Light source.

Light is an important factor for jellyfish to replenish their energy. There are algae in the jellyfish body, single-celled algae. They supply the jellyfish with oxygen produced by photosynthesis, and the nitrogenous waste produced by jellyfish metabolism is provided to the unicellular algae in the body. The relationship between the two is interdependent.