Fish can't read maps, and their eggs and larvae drift across national boundaries. Recent research shows that local problems in one fishery can affect others across wide areas.
The eastern Arctic and sub-Arctic marine areas of Canada are changing rapidly under climate change.
Companies are developing technologies to mine the deep sea, but environmental regulations have yet to be finalized.
These trackways preserve an incredibly brief moment in time. More importantly, they tell us about ancient climates, and how turtle breeding ranges have changed over the millenia
Plastic washed ashore from the ocean is hard to recycle. What else can we do with it?
A warming climate will affect the way waves hit over 50% of the world's coastlines, increasing erosion and the risk of flooding.
As the oceans warm, fish are moving to stay in temperature zones where they have evolved to live. This is helping some species, hurting others and causing a net reduction in potential catch.
Media coverage of sharks often exaggerates risks to people, but more than 500 shark species have never been known to attack humans, and there's lots to learn about them.
Hagfish have been called the most disgusting creatures in the ocean. But what are they?
When Julia Sigwart went looking for the scaly-foot snail – or Sea Pangolin – in the deep ocean, they were hard to find. Now they are seen as endangered from the prospect of deep sea mining.
Strictly enforced no-take marine areas benefit everyone, from the fish to fishers.
It's not just the ocean we need to worry about – plastic is accumulating in the world's rivers, too.
A new network of 20 sites have been declared as marine protected areas in South Africa.
In a study that cultivated coral 'gardens' with varying numbers of species, plots with more species were healthier. This finding could inform strategies to help coral reefs survive climate change.
We know very little about the deep sea and how its inhabitants, including anglerfish, will respond to change. In fact, more people have walked on the Moon than have been to the bottom of the ocean.
Floating cities are back on the agenda, with the UN recently hosting a meeting on the subject. The latest in a long line of proposals since the '50s was unveiled, but just how feasible is the idea?
New research reveals that miniature, brightly coloured fish play an outsized role in the marine food chain in coral reefs.
Thousands of years ago, carbon gases trapped on the seafloor escaped, causing drastic warming that helped end the last ice age. A scientist says climate change could cause this process to repeat.
Phytoplankton are tiny, but they do important work.
Photons stream from the sun and interact with all matter on Earth. Depending on what the light touches, some of the photons will get absorbed or soaked up. And some will bounce back.