World Jellyfish Day

World Jellyfish Day is observed on November 3, offering a chance to learn about these unusual ocean animals and the important role they play in marine life. Their drifting movements and translucent bodies can make them seem mysterious, but jellyfish are living animals with fascinating features worth exploring.

How World Jellyfish Day started

The exact origin of World Jellyfish Day is not well documented. The University Museum of Bergen marks the observance on November 3, celebrating jellyfish diversity and sharing images of species collected by its team. NOAA Ocean Exploration also recognized the day on November 3, 2019, with facts and images of jellyfish seen during ocean expeditions.

The day offers a reason to look beyond the nuisance or fear jellyfish can sometimes inspire. The University Museum of Bergen describes them as an integral part of healthy pelagic ecosystems and important members of planktonic communities. Observing jellyfish with care—whether in a book, at an aquarium, or from a safe distance in the ocean—can turn a simple encounter into an opportunity to learn.

What makes jellyfish distinctive?

Jellyfish are marine animals with soft, gelatinous bodies. Many have a bell-shaped form and trailing tentacles, though their appearance varies across species. They do not have bones, and their bodies are largely made up of water. Instead of swimming with strong, continuous strokes, many jellyfish pulse their bells to move through the water, while ocean currents can carry them along.

Jellyfish are not fish, despite the familiar name. They belong to a different group of animals, and they do not have the features people usually associate with fish, such as fins and a backbone. NOAA Ocean Exploration notes that jellyfish use their tentacles to sting prey, including plankton. Some species have stinging cells, so it is wise not to touch a jellyfish found on the beach or in the water, even if it appears to be dead.

Jellyfish in the ocean and in human culture

Jellyfish are part of marine food webs. Some animals feed on them, while jellyfish eat small organisms and other prey, depending on the species. NOAA Ocean Exploration notes that animals including tunas, sharks, turtles, and humans eat jellyfish. Their presence and movements are part of the changing life of the ocean, alongside familiar marine animals such as fish, turtles, and seabirds.

People encounter jellyfish in many ways: floating beneath the surface, washed onto shore, or displayed in aquariums. Their glowing or transparent appearance has also made them memorable subjects for art, photography, and stories. An aquarium visit can offer a close look at their movement without disturbing wild animals, while a picture book or nature documentary can introduce species from different parts of the world.

Ways to celebrate World Jellyfish Day

• Look up a local aquarium’s jellyfish exhibit and read its information about the species on display. Notice the shapes, colors, and patterns of movement.

• Choose a reliable ocean-life book or documentary and learn how jellyfish move, find food, and fit into their habitats.

• Make a jellyfish craft with paper, recycled materials, or fabric. Add details inspired by real photographs rather than assuming every jellyfish looks the same.

• If you are visiting the beach, observe marine life without touching it. Follow local safety signs and guidance, and tell a responsible adult or beach staff member if you spot a jellyfish in a swimming area.

• Share one new thing you learned with family or friends. A simple conversation can help replace fear or confusion with respect for ocean animals.

Reviewed by the Holiday List editorial team on November 2, 2026 · Last updated November 2, 2026.

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