It’s Jellyfish Day!

It’s Jellyfish Day—celebrate by learning about a few of the jellies that can be found in our Jellies Invasion exhibit! 

Published November 03, 2017

The lion’s mane jelly can be found in the Arctic and north Pacific oceans, from Alaska to Washington. They are the largest species of jelly–their bells can reach up to 8 feet in diameter and their tentacles can grow to more than 100 feet long. The lion’s mane jelly is named for its red and yellow tentacles, which resemble the color of a lion’s mane. 

This jelly is usually found within 65 feet of the ocean surface, where they feed on zooplankton such as small fish, shrimp and other jellies. The lion’s mane jelly captures its prey by using a toxic sting from its tentacles. After the prey has become immobilized, special tentacles called oral arms transport the prey to the jelly’s mouth.

The moon jelly is named for its translucent, moon-like circular bells. Instead of long tentacles, moon jellies have short, delicate tentacles that hang from their bells. Moon jellies can be found in temperate and tropical oceans worldwide, usually near the surface of shallow bays and harbors. 

Moon jellies feed mostly on small plankton such as mollusks, crustaceans, fish eggs and other small jellies. Their tentacles have toxins that help hold the prey long enough for them to swallow it. However, their sting is too mild to be harmful to humans! 

The coloration of a moon jelly can change depending on their diet. If they feed mostly on crustaceans, they will turn pink or lavender. When deprived of food, moon jellies can shrink to one-tenth of their original size to save energy. They redevelop to their normal size when food becomes available. 

The blue blubber jelly can be found in the coastal waters of eastern and northern Australia. They range in color from light blue to dark purple and can grow up to about 16 inches wide. The blue blubber jelly pulses in a distinctive, staccato-like rhythm. 

This jelly has eight oral arms that each contain several mouths to transport food to its stomach. Their tentacles contain stinging cells that help them capture zooplankton, such as crustaceans.


Watch our blue blubber jellies wherever you are! Check out our live stream here.

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