American Oceans

Nomura’s Jellyfish

Nomura’s jellyfish, also known as Echizen kurage and scientifically named Nemopilema nomurai, is one of the largest species of jellyfish in the world.

a nomura's jellyfish washed up near the rocky shore

It can grow up to six feet long and weigh up to 450 pounds, making it as heavy as a full-grown lion.

This jellyfish is native to the waters of the Pacific Ocean, particularly in Japan, Korea, and China.

Read more below to learn all about this amazing jellyfish!

Physical Characteristics

Nomura’s jellyfish is one of the largest jellyfish species in the world. They can grow up to 2 meters (6 ft 7 in) in diameter and weigh up to 200 kg (440 lb). They can reach this size in less than a year.


Nomura’s jellyfish is usually brownish-yellow or reddish-brown in color.

However, their color can vary depending on their diet and environmental factors.

For example, if they eat a lot of shrimp, their color may turn pinkish.


Nomura’s jellyfish has a bell-shaped body with a deep circular groove that delimits the central part from the periphery.

The periphery is divided into broad flaps, or lappets. The marginal tentacles are large and solid.

Their shape allows them to move efficiently through the water. They use their bell-shaped body to propel themselves forward and their tentacles to catch prey.

Overall, Nomura’s jellyfish is a fascinating creature with unique physical characteristics that allow it to thrive in its natural habitat.

Habitat and Distribution

Nomura’s Jellyfish resides primarily in the Yellow Sea and East China Sea.

However, it has been reported in other parts of the world, including the Sea of Japan, the Pacific Ocean, and the North Atlantic Ocean.

Preferred Habitat

The various species of jellyfish live in a wide range of different habitats. Nomura’s Jellyfish is no exception.

It prefers to live in semi-enclosed basins of marginal seas and offshore waters.

It can be found in both coastal regions and pelagic regions of the open ocean. It is also known to occupy frigid arctic waters.

Migration Patterns

Nomura’s Jellyfish is known to migrate in large groups. These groups are known as blooms.

Blooms occur when the chitin-covered podocysts develop into adults upon exposure to high temperatures. These blooms appear to be increasing in frequency in the past 20 years.

In conclusion, Nomura’s Jellyfish is a fascinating creature that is primarily found in the waters between China and Japan.

It prefers to live in semi-enclosed basins of marginal seas and offshore waters. It is also known to migrate in large groups, which are called blooms.


Nomura’s jellyfish are known for their large size and voracious appetite.

They are primarily found in the waters of the Sea of Japan and the Yellow Sea, where they exhibit interesting behavior patterns.

Feeding Habits

Nomura’s jellyfish are carnivorous creatures and feed on small plankton, crustaceans, and fish eggs.

They have hundreds of microscopic mouths that they use to capture their prey.

These jellyfish are known for their voracious appetite and can consume large amounts of food in a single day.


Nomura’s jellyfish have few natural predators due to their large size and venomous tentacles.

However, some species of sea turtles and sunfish have been known to feed on them.

Humans also catch these jellyfish for food, but they are not commonly consumed due to their tough texture and unpleasant taste.


Nomura’s jellyfish reproduce sexually and asexually. The males release sperm into the water, which is then taken up by the females.

The fertilized eggs develop into larvae, which then settle on the seafloor and develop into polyps.

These polyps can remain dormant for several years before developing into adult jellyfish.

Nomura’s jellyfish can also reproduce asexually by budding, where a small piece of the jellyfish breaks off and develops into a new individual.

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