Fish

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.

Scientists at Norway's SINTEF have developed a way to turn as much of a salmon as possible into useful products, including food supplements and fire retardants. By using new low-temperature processes, the goal is to use every last gram of the fish.

For some time now, there have been concerns that microplastic particles eaten by fish could be passed along to human seafood consumers. According to a new study, though, such may not be the case with sea bass, and possibly not with many other fish.

Scientists have discovered ultra-black fish that absorb almost all light that hits them, allowing them to effectively hide in the deepest, darkest parts of the ocean. The find could help inform future advances in optical and camouflage technology.

A study by the University of Maryland indicates that new offshore wind farms being constructed on the Delaware-Maryland-Virginia coastal shelf could become a stopover spot for migrating Atlantic salmon and striped bass.

Measuring more than 5 m (16 ft) long, Titanichthys was a giant armored fish that swam the oceans 380 million years ago. It may sound intimidating, but new research suggests that it fed in a manner much like that of today's harmless basking shark.

Although they don't have eyelids that they can close, fish do indeed sleep – and as is the case with humans, sleeping is crucial to their health. According to a recent study, though, city lights may be keeping them awake at night.

A new study has demonstrated how the atomic bomb tests from the Cold War era could help fill in some of the blanks for marine biologists, with scientists using nuclear isotopes to measure the age of the whale shark for the first time.

Marine aquaculture pens have to be regularly checked for holes, plus the fish need to be inspected for parasites. And although the job is typically performed by human divers, it turns out that a robotic sea turtle may be a better choice for the task.