Fish

Animals, like us, experience a deterioration of memory in old age. But a new study suggests that cuttlefish are the first species in which this appears not to be the case.

Given that they're such good swimmers, the structure of fish is increasingly being copied in the design of underwater robots. Scientists have now discovered that by adjusting the stiffness of their tails, those bots can swim much more efficiently.

Does it contain EPA or DHA? A new meta-analysis of 38 randomized controlled trials is suggesting the key to beneficial cardiovascular outcomes from omega-3 supplements could come down to the specific kind of fatty acid being consumed.

In an effort to uncover what waters polluted with pharmaceuticals could mean for marine organisms, a study has demonstrated a capacity for brown trout to become addicted to methamphetamine after exposure to environmentally relevant concentrations.

If you're going to check how fish are affected by hydroelectric dams, it's particularly important to monitor tiny, delicate individuals. That's why US scientists have developed what is claimed to be the world's smallest fish-tracking tag.

As if the ray fishes weren't unusual enough already, it turns out that their sperm is also unique. Scientists have now created a robot inspired by those sperm, which may someday lead to smaller descendants that swim within the human body.

Most fish utilize a mouthful of water to swallow their prey. According to a new study, however, moray eels are unique in not doing so, allowing them to feed while out of the water … with some help from a second set of jaws in their throat.

The people of Singapore consume a lot of fish, and – perhaps surprisingly to some of us – a lot of frog meat. Scientists have now developed a method of converting the waste from both foods into a material that helps bone to regrow.

Modern scientific techniques are rapidly improving our understanding of how plastic pollution can impact marine organisms, and a new study has demonstrated how they can also be used to understand the plight of creatures past.

As is the case with other types of livestock farming, antibiotics are widely used in aquaculture to prevent disease. There may soon be a healthier and more eco-friendly alternative though, in the form of seaweed added to existing fish food.

When spawning fish travel through the canals of Utrecht, they're often blocked by the city's closed Weerdsluis lock. Regular citizens are now helping the fish to get through, though, using an online "fish doorbell."

Like most other commonly used types of plastic, polyurethane is typically made from non-renewable crude oil, and it takes centuries to break down when discarded. Now, however, scientists have created a biodegradable polyurethane-like polymer using fish waste.