Jellyfish are an important type of plankton, including cnidarians, in the aquatic environment. These beautiful aquatic creatures have a transparent umbrella-like bodies, with the diameter of the umbrella-shaped body varying depending on the species.

Some large jellyfish can even have a diameter of up to 2 meters. On the edge of the umbrella, there are beard-like tentacles, with some reaching as long as 20-30 meters.

Jellyfish can be found in various water, including tropical, temperate, shallow, and deep oceans, as well as freshwater areas. These creatures have existed for over 650 million years and predate dinosaurs. With over 250 species distributed in waters all over the world, jellyfish are an integral part of the ocean ecosystem.

Unfortunately, there are over 400 ocean dead zones in the world, and jellyfish are one of the very few creatures that can adapt to such areas. Scientists believe that environmental stressors, such as climate change, pollution, fish overfishing, and dams, are contributing to the spread of jellyfish.

The main component of a jellyfish's body is water, with inner and outer germ layers, and a thick mesogel layer in between. This mesogel layer is not only transparent but also has a floating effect, allowing jellyfish to move forward by using the water jet reflex in their bodies.

The umbrella-shaped bodies of some jellyfish also have various patterns. In the blue ocean, these swimming jellyfish of different colors look mesmerizing.

Despite their docile appearance, jellyfish are actually ferocious carnivores. Their slender tentacles are their digestive organs and weapons, covered with countless poisonous stinging cells that can shoot out venom to quickly paralyze prey.

Jellyfish are undoubtedly one of the most beautiful creatures in the ocean. Their delicate bodies and elegant tentacles make them look like "spirits" swimming in the ocean. They can be seen everywhere in the ocean and some freshwater lakes, and here are three unusual jellyfish to admire:

White Spot Jellyfish

The white-spotted jellyfish, also known as the Australian spotted jellyfish, is native to the Southwest Pacific waters.

They are large and usually feed on species such as snails, but in some waters, white-spotted jellyfish is a marine creature of concern because they filter large amounts of seawater while also devouring the plankton that some fish need to survive.

Blue Jellyfish

The blue jellyfish has a brilliant blue body and stinging tentacles. They are commonly found in Scotland, the North Sea, and the Irish Sea region. The blue jellyfish is usually about 15 cm long and looks like a blue-colored ball.

Crystal Jellyfish

Crystal jellyfish have a lifespan of around six months, from late spring to autumn, and are often distributed on the west coast of North America. They feed on mollusks and some zooplankton and are also cannibals.

When hunting, they will use their tentacles to lure their prey before swallowing it. The crystal jellyfish is almost completely transparent and colorless, but it can emit blue fluorescent light that changes to green light.

Jellyfish are fascinating and beautiful creatures that have been around for millions of years. They play an important role in the ocean ecosystem, but their adaptation to ocean dead zones is concerning.

As we continue to harm the environment, we must ensure that these beautiful creatures, along with other marine life, are protected for future generations to admire and appreciate.