Fish

In a surprising first, researchers found that scalloped hammerhead sharks act like air-breathing marine mammals, holding their breath to stay warm when they deep-dive into cold water for food and making them vulnerable to humanity's deep-sea exploits.

When designing fish-like underwater robots, you want a means of propulsion which is both energy-efficient and reasonably speedy. A new tail-flapping system may fit the bill, paving the way for wider usage of such bots.

In the past two years, Israel's Steakholder Foods has brought us a lab-grown steak and lab-grown Wagyu beef morsels. Now, it has produced what it says are the world's first whole fillets of cultivated fish … grouper, to be precise.

Mussels and other mollusks usually aren't thought of as being all that active. Recently, however, scientists have documented a water-squirting behavior in just one species, which is apparently using the action to give its larvae a fighting chance.

Although salmon farms help take pressure off wild stocks, the penned fish do produce a lot of waste which is concentrated at one location. A new farm is exploring a solution to that problem, by raising salmon and kelp in adjacent pens.

A new study has shown that foods that come from the ocean or freshwater, known as "blue foods," have the potential to address several important global issues, including nutritional deficits, disease, and climate change.

The myth that goldfish have only a three-second memory might sell short their mental capabilities. A new study shows some fish can recognize themselves in a photo, meaning they join a pretty exclusive club of animals known to have some self-awareness.

Most of what we know about ancient extinct animals comes from their bones, since soft tissues don’t usually fossilize well. But now, scientists have discovered the oldest preserved vertebrate brain, in a fossilized fish almost 320 million years old.

When you're looking at a tank full of fish at a public aquarium, it can be difficult to figure out which ones are which species. The AI Aquarium is designed to help, by overlaying information that lines up with the individual fish in question.

Imagine if there were a robotic fish that filtered microplastic particles out of the water as it swam. Well, now there is one, and it's the physical version of the winning concept in the first-ever Natural Robotics Contest.

Ever wonder how deep-sea fish are able to survive in an environment where the water pressure would kill us humans? Well, the secret lies in a chemical that occurs naturally in their cells – and we now have a new understanding of how it works.

Soft tissues don’t fossilize well, so scientists have to infer organ anatomy from bones. But an unexpected treasure trove of new information has been discovered in Australia, with a 380-million-year-old fish fossil preserving the oldest heart ever found.