From Encyclopedia: Kids Learning

Blobfish: The Ultimate Survivor

It’s famous for being the "world’s ugliest animal," but that pink slime photo is a lie! See the real, super-strong deep-sea survivor behind the meme.

Water Animals March 31, 2026 3 min read
Listen to this story
0:00 / 0:00
What's Inside A Blobfish | What's Inside? | Science Insider · Insider Science · 4:19

The Pink Slime Myth

You know the face. It looks like a grumpy pile of pink slime or a melted scoop of ice cream. In 2013, the blobfish was voted the World’s Ugliest Animal. It became an internet meme instantly. But that famous photo is unfair. That fish is actually having a very, very bad day.

In its natural home, the blobfish looks like a totally normal, grayish fish. It lives deep underwater off the coasts of Australia and New Zealand, between 600 and 1,200 meters down. At that depth, the water pressure is 120 times stronger than at the surface. That heavy pressure holds the blobfish together. When humans drag it up to the surface in nets, the pressure disappears. Its body expands and collapses into the goofy pink mush you see in pictures. It is suffering from extreme decompression. A living blobfish swimming in its natural deep-sea habitat

Jelly Muscles

Cross-section illustration showing the blobfish's jelly-like body

Most fish have a “swim bladder”—a gas-filled sac inside their body that acts like a built-in life jacket to help them float. But the blobfish lives so deep that a gas sac would get crushed instantly. Instead, evolution gave the blobfish a different superpower: flesh that feels like Jell-O.

Its body is made of a gelatinous goo that is slightly less dense than water. This works like oil floating on top of vinegar. Because its body is naturally floaty, the blobfish doesn’t need to swim hard to stay off the ocean floor. It hovers just above the sand without using any energy at all.

The Lazy Hunter

Illustration of a blobfish waiting for prey on the sea floor

Food is hard to find in the deep, dark ocean. Chasing prey burns too many calories, so the blobfish plays the waiting game. It has very little muscle, but that is part of the plan. It drifts along like a ghostly balloon, waiting for a crab, sea pen, or shellfish to wander too close.

When a snack appears, the blobfish snaps it up. It doesn’t need speed; it needs efficiency. While sharks and tuna are racing around burning energy, the blobfish survives by being the calmest creature in the sea. In the crushing blackness of the deep ocean, looking “ugly” on land doesn’t matter—survival does.

Keep exploring

Read Land Animals & Water Animals here or in the app

Read every story in both shelves right here on the web, or open them in Encyclopedia: Kids Learning with narration you control. The full 1,000+ topics come with the app, covering space, the human body, history and more. Ad-free, ages 5–12.