Fish

It's important for fish farmers to keep track of the number of fish in their pens, but doing so involves going in and actually netting out some of the fish. According to new research, echo-sounding tech could soon serve as an easier alternative.

Some animals sustain grave injuries and may struggle to return to full health, while others possess a remarkable ability to regenerate damaged tissue. A new study suggests whale sharks may have more in common with the latter group than previously thought.

Scientists have sequenced the genome of a “living fossil” from the time our ancestors first crawled out of the oceans. The Australian lungfish genome is the largest of any animal sequenced so far, revealing it to be our closest living fish relative.

It has generally been thought that electric eels are purely solitary animals, which stalk prey on their own. Now, however, scientists have described seeing the creatures hunting in packs – which only nine other fish species are known to do.

Back in 2014, we heard about a so-called "fish gun" or "salmon cannon" that safely shot spawning fish up over river-blocking obstacles such as dams. Its successor is now in use, offering a couple of key advantages over the original system.

Dams pose a great obstacle to fish migrating up rivers, potentially keeping them from breeding, thus leading to a decline in wild stocks. Australian scientists are on the case, though, with a possible solution known as the "tube fishway."

Hydroelectric turbines may indeed be a non-polluting source of electricity, but their spinning blades can nonetheless kill larger fish that are passing through. A new type is designed not to do so, while maintaining a compact form factor.

Human civilization wouldn’t be where it is today if we hadn’t domesticated animals. Now researchers have discovered the first example of an animal domesticating another animal, with a fish species found to recruit shrimp to tend their algae farms.

A team of scientists from three notable oceanographic institutions has discovered the largest-ever aggregations of fish to be seen in the abyssal deep-sea region of between 9,800 and 19,600 feet beneath the ocean surface.

The skeletal structure of a fish's gill arches and paired fins are quite similar – enough so that it was once believed the fins evolved from the arches. Although that theory has since been discounted, a new study suggests it may have been correct.

Even though they don't have flexible tongues, catfish are still able to rotate captured prey within their mouths. A new understanding of how they're able to do so could ultimately lead to more dextrous underwater robots.

A new study has delved into underwater behavior of remora, producing the first-ever continuous recordings of these so-called suckerfish in action and showing how they surf, feed and even socialize on the surface of blue whales.