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Copyright © 2026 Ocean Park Hong Kong. All rights reserved.

Ocean Park Corporation is a charitable institution registered with Inland Revenue Department, Hong Kong (File No: 91/2801).

Ocean Park Hong Kong, 180 Wong Chuk Hang Road, Aberdeen, Hong Kong | Tel: (852) 3923 2323 | Fax: (852) 2873 5584

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  • Sea Jellies
Invertebrates

Sea Jellies

Other Common Name(s)

Jellyfish

Body Weight

Depending on species, some may exceed 200 kg

Body Length

The largest species, lion’s mane jellyfish (Cyanea capillata), can have tentacles reaching about 36m. The tiniest species are less than 2cm long.

Habitat

Ocean

Diet

Plankton, fish, crustaceans and other sea jellies

Fun Facts

  • Sea jellies appeared before dinosaurs. They have been living on Earth for over 650 million years.

  • The tentacles of sea jellies are used for feeding and defense. With cells containing barbs and venom, these body structures can sting and kill their prey. One of the most venomous species, sea wasps (Chironex fleckeri), can poison a human to death in a few minutes.

Distribution

Found globally in all oceans from tropical to polar waters

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Sea Jelly Spectacular

Marine World | Summit

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Invertebrates

Sea Stars

Fish

Sandbar Shark

Amphibians

Chinese Giant Salamander