Fish
Rarest sharks in the world: Before long many of these fascinating creatures could be extinct, warn Shark Trust
Uncover the mysteries of the ocean's most elusive predators with our roundup of the world's rarest species of sharks and rays
10 deadliest fish: you won't want to meet these species underwater
Beyond the shark! We bring you a veritable who's who of the scariest fish species lurking in the deep (and not-so-deep) waters.
“They are fish... but they can walk!" Amazed scientists discover exactly how mudskippers move on land
The unique anatomy of the amphibious fish has allowed it to master life both in and out of water.
11 weirdest sharks: We take a deep dive into the ocean to discover some of its strangest creatures
Celebrate the wonder and variety of these ancient, much-misunderstood fish in our list of the weirdest sharks in our oceans
More than Jaws: 34 incredible, hard to believe shark facts that celebrate this fascinating, yet much-maligned fish
Celebrate the wonder and variety of sharks, an ancient and much-misunderstood fish.
Is there really a shark that walks? Oh yes - meet the walking shark
There are a few species of 'walking' fish, but did you know there was a walking shark? Read on...
'Lord Sauron piranha': scientists name new Amazon species after terrifying Lord of the Rings villain
The newly described fish – named after Middle Earth's powerful Lord Sauron – is vegetarian, eating mainly plants.
Can piranhas actually kill a human?
Could piranhas actually kill a human? Stuart Blackman takes a look at the evidence?
Critically endangered fish with red hands and 'sad toad face' returned to the wild in Tasmania
18 critically endangered red handfish have been released back into the wild after being taken into captivity to protect them from marine heatwaves.
Weirdest fish: 13 of the strangest fish in the world
Our seas are brimming with strange and wonderful creatures. Meet 13 of the weirdest fish in the world, which sport everything from super-long noses to golfball heads
How long can a fish live out of water? Meet the strange mangrove rivulus fish who can survive in logs when the water dries up
The amount of time a fish can survive out of water depends on the type of fish, and there is one species that is particularly adept...
Meet the very weird Pacific barreleye fish, which is famed for its see-through skull
With its see-through head, the Pacific barreleye fish is one of the weirdest fish in the ocean. Learn all about it in this expert guide from Dave Brian Butvill
Venomous lionfish are invading the Mediterranean Sea. The rise of these deadly predators has scientists worried
The species’ rapid spread across the Mediterranean, including to habitats previously thought to be unsuitable, could have significant ecological impacts.
Monstrous prehistoric salmon with teeth like warthog tusks once roamed the Pacific Ocean
Palaeontologists believe the teeth of the giant fish – which was almost three metres long – may have been used for fighting and digging nests.
Fish are mysteriously spinning in circles and dying in Florida. And scientists don't know why
Experts are getting involved to get to the bottom of the worrying phenomenon that is killing Florida's critically endangered smalltooth sawfish.
Schools of fish can swim as quietly as individuals. How 'acoustic stealth' could inspire next wave of submarines
The way fish move has a significant impact on how noisy the school is, according to a new study. Engineers say the finding could lead to the development of stealthier underwater vehicles.
Europe is dismantling its dams at a record-breaking rate – and it's saving rivers
Positive news for fish and other wildlife as 2023 was another record-breaking year for removing dams, weirs and other river barriers, freeing Europe’s rivers and restoring healthy habitats.
Fish Doorbell: The viral livestream that’s saving fish in the Netherlands
A canal lock in the Dutch city of Utrecht has been making a splash with its underwater livestream. But what is the Fish Doorbell and how is it helping local wildlife? Dive in for the full story...
Hammerheads come equipped with underwater metal detectors, and hold their breath to dive to the deep
Scalloped hammerheads captivate the imagination of scientists, conservationists, and nature enthusiasts alike. Here’s why
How do fish breathe?
Uncover the secrets of fish survival beneath the waves
There’s a fish in Tasmania with hands instead of fins, and scientists are about to save it from extinction
Amid concerns about the risk of upcoming marine heatwaves, 25 critically endangered red handfish have been removed from the wild in a bid to save the species from extinction.
Seahorse guide: what they are, where they live - and why they change colour
Neil Garrick-Maidment explains all you need to know about seahorses, from why the males get pregnant to why they change colour
It’s a slimy, prehistoric parasite with the mouth of an alien. And two fearless photographers are obsessed with finding it
The sea lamprey is not a creature with mass appeal, yet there is something about this ancient and mysterious eel-like fish and its extraordinary life-cycle that fascinates photographers Sébastien Barrio and Aurore Barrio.
10 cuttlefish facts you may not know
Learn all about the amazing colour-changing cuttlefish