The Tiny Fish That’s Changing Modern Medicine

When you look at a zebrafish, you probably just see a cute, tiny fish that’s smaller than your pinky finger. But this little fish is so much more than that. You’re looking at an amazing scientific tool that has led to some major discoveries. Zebrafish have been used since the 1970s to study the development […]

All About Anglerfish

Did you know that about 70% of our planet is covered by water—that’s more than half of the world we live in! And the oceans are just full of all kinds of amazing living things! We’ve already told you about animals like dolphins, and penguins, and even the blobfish. But have you ever heard of […]

The Truth About That Fish That Climbs Into Urethras

[INTRO ♪] The candiru is a legendary monster. This parasitic Amazonian catfish is said to swim up into the urethras of unsuspecting bathers and devour their genitals from the inside out. It’s a terrifying tale—and one that we’ve actually told here on SciShow a couple of times. But science has shown that this story is […]

Fish Pee: The Coral Reef Superfood

The ocean is full of mysterious deep-sea life, sunken historical artifacts … and a whole lot of pee. I’m not just talking about those of you who think the ocean is his personal port-a-potty. There are millions of animals that live, eat, and make lots of waste in there. It might sound kind of gross, […]

How Do Fish Breathe? | Animal Science for Kids

Squeaks and I are adopting a pet goldfish! He lives in a fish tank, and he’s a great swimmer! In fact, this little guy’s whole body is really suited to life in the water. He has great fins to help him swim, and eyes that can stay open in the water. These special body parts […]

Why Megalodon (Definitely) Went Extinct

About 8 million years ago, a little baleen whale was swimming in the warm coastal waters of Peru. It was only about 3 or 4 meters long, about the size of a Beluga whale, and while it filtered mouthfuls of plankton-rich water, it was unaware that just below it swam a predator. Like the great […]

These Fish Eat Scales

[♪ INTRO] You’re probably pretty familiar with the Hollywood image of piranhas. The water starts churning, and suddenly an unlucky animal is nothing but a bare skeleton. And yeah, piranhas can definitely do some damage, but most of them aren’t these ferocious monsters. They eat lots of different things, and many piranhas — along with […]

The Mystery of the Barreleye Fish

Just off the west coast of the United States, deep down in the Pacific Ocean, there lives a fish. And not just any fish. With its long, bulging eyes and transparent head, the Pacific barreleye fish is a little… different. Biologists don’t actually know much about it, because like many deep-sea animals, the barreleye is […]

When Fish First Breathed Air

385 million years ago, the land was all but empty. The continents were home to only some sparse plants and fungi, and a few pioneering arthropods. Life in the oceans, however, was booming. The waters teemed with squid, bony fish, and sea scorpions. But there was one group of fish that was about to go […]