Category: Cnidaria

Underwater Fact 139

The Jellyfish population in Japanese waters is 100 times greater than 20 years ago.

Nomura’s Jellyfish swarm   © Amazing Story’s

Nomura’s Jellyfish are in the same size class as the lion’s mane jellyfish, the largest jellyfish in the world.
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Underwater Fact 135

Turritopsis Nutricula is a species of Jellyfish that can age backwards.

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Underwater Fact 114

Siphonophores are marine invertebrates that look like a single organism but actually consist of a colony of many individual animals.

Portuguese Man of War   ©  Magnus Lundgren

Some siphonophora superficially resemble jellyfish, like the best known species of this kind:
The dangerous Portuguese Man o’ War.
Others form one of the longest animals in the world, reaching up to 50 metres in length.

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Underwater Fact 93

The Clinging Jellyfish is a tiny colourful creature that uses its tentacles to attach itself to ships and hitchhikes long distances around the globe.

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Underwater Fact 75

Box Jellyfish (Chironex fleckeri) are among the most venomous creatures in the world. To coordinate their movement underwater they rely on a nerve ring around the base of the umbrella as well as on their 24 eyes.

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Underwater Fact 71

Clownfish are protandric hermaphrodites that mature first as a male and then later change sex to become a female.

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Jellyfish Lake in Palau is a unique place on earth where several coincidences have made it the perfect environment for millions of jellyfish to evolve their own species – perfectly adapted and isolated from the rest of the world.

JELLYFISH LAKE     © Sarosh Jacob

Around 12 000 years ago, as the water level was decreasing, the lake was formed as a natural basin of rocks and lime stones with only a few living creatures trapped inside it.

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They can thrive in warm and cold waters, along coastlines or out in the deep. Their bodies are made up of around 95 percent water. Even though they have no brains, jellyfish have somehow been smart enough to survive for over 500 million years.

Blubber Jellyfish   © Samuel J Shelton

The Blue Blubber Jellyfish (Castostylus mosaicus) is common along the east coast of Australia from shallow seas to estuarine waters. Their recognized blue color comes from their symbiotic relationship with algal plant cells that are kept inside its body.

One of the most unusual organisms found residing on the bottom in tropical waters is the Upside Down Jellyfish (Cassiopea xamachana) who spends most of its time resting on the bottom with it’s stingy tentacles extended upwards into the water.

Upside Down Jellyfish   © Donnali

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