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Jellyfish

Did you know?

Cnidaria

No bones, no brains, no teeth, fins or even blood – in fact, jellies are mostly water. But they survive in oceans all over the world, and are mesmerizingly beautiful as well.

Drift with Jellies

Drifting, pulsing
Touch the jelly globe.
Drifting, pulsing, drifting… From golden Pacific sea nettles to translucent white moon jellies, our jelly habitat is captivating. Touch the big jelly globe, constantly streaming up and out.
Giant glass jellyfish
Kait Rhoads' ocean vision
Just past the Baja Bay habitat, look up – you’ll see three enormous jellyfish hanging from the ceiling, made of hundreds of blown glass pieces. In this sculpture, Seattle artist Kait Rhoads combines imagination with a passion for the ocean.
Read the story

Meet our jellies

Lion's Mane
Blubber jelly
Egg yolk jelly
Moon jelly
Pacific sea nettle
Eating
(and predators)
Jellies use stinging cells to sting and immobilize prey. The long oral arms begin to digest the prey and bring it to the jelly’s mouth, found under the bell.
Most jellies eat plankton, plus young shrimps, crabs, fish and other jellies. They’re eaten by other fish, and leatherback turtles travel for miles to eat Pacific sea nettles.
Larvae, polyps
to medusa
Adult jellies (‘medusa’ form) release sperm and eggs, which combine into free-swimming larvae. These settle onto rocks and grow into a polyp.
Polyps catch zooplankton with their tentacles, developing stacks of frilled discs that break off, drift and grow into adult medusae.
Watch that sting
and give a squeeze
Most jellies have mild toxins that don't bother humans. But some can be as painful as bee stings, and a few, like the sea wasp, can be extremely dangerous.
Giving their transparent muscles a synchronized squeeze, a jelly throws its body into a wave to move outward from the bell and push it through the water.

Changing climate

Changing oceans.

THE THREAT: Jellyfish play a vital role in the ocean food chain, eating plankton and giving food to turtles and fish. Their populations are stable – but recently they’ve been “blooming” in unusual places.

TAKE ACTION: Scientists are still studying how human activity and climate change affects jellies. Meanwhile, it is threatening many other ocean animals. Find out how you can help.

Aquarium Stories

Behind the Shimmer

It’s more than just a play of light. Wander down the ramps of the new Pacific Seas Aquarium, and you’ll pass through shimmers of colored light. You’re immersed in their play and flicker, as if swimming through a sunlit lagoon. It’s art – the light installation “Shimmer,” by California artist Gordon Huether – but the … Continued

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Lunchtime in the aquarium

Animal care aide Jordan Jirik lies flat on her stomach, her head hanging over the top of Baja Bay’s 280,000-gallon habitat. Below her, five hungry spotted eagle rays swim eagerly up to a large black sign with a big white X emblazoned on it. It’s their feeding-station target. And when it appears in the water, … Continued

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We opened the Pacific Seas Aquarium!

Two dozen necks crane up, up, up, eyes riveted on the scene above, as four hammerhead sharks cruise overhead. Sunny the sea turtle joins the scene, swimming unhurriedly by and then diving deeper into his home. Suddenly, two eagle rays “fly” overhead, their pectoral fins gently flapping up and down to propel them through the … Continued

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Who's Nearby?
Love our jellies? Then wander down the ramp to Under the Narrows, home to many Puget Sound species.