Fish

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.

We already know that waterborne plastic particles can enter the bodies of fish, which are then eaten by humans. New research, however, shows that such particles can enter the food chain via another route, by traveling from plants to insects to fish.

Even though the basking shark is the world's second-largest fish, much of its life has eluded observation. Now, however, researchers have determined that the usually solitary animals find mates by meeting up and circling around one another.

After being introduced to Russia's White Sea, non-native Pacific salmon have since spread along Norway's coastline and into its rivers. In an effort to control their numbers, an AI-enabled fish-identifying gate has been placed on a Norwegian river.

While the farming of salmon does help take pressure off wild stocks, the feed used to raise the fish still isn't entirely sustainably sourced. That may change, however, thanks to nutrient-rich worms that eat readily available seaweed.

Despite protective measures, endangered fish species are regularly caught then sold in open markets. And while visually searching them out can be difficult, a new technology could more easily allow authorities to know which species are being sold.

While many people love the taste of smoked salmon, not everyone is comfortable with wild fish being netted, nor with captive fish being farmed. Such folks may be in luck, as a new smoked salmon substitute is in the works – and it's made of algae.

One of the ironies of salmon farming lies in the fact that although the salmon themselves aren't wild-caught, their feed is made up of fish that are. According to new research, it would be ecologically better if we just ate those feed fish ourselves.

Researchers at Harvard and Emory have created a biohybrid fish out of human heart cells that swims autonomously for months at a time as the cells beat. The project is a sidestep on the way to eventually growing new functional hearts for transplant.