Fish
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
Is there really no such thing as a fish?
It's a saying you might be familiar with, particularly if you listen to the popular podcast by the QI Elves, but how true is it? Is there really no such thing as a fish?
Why do seahorses look like horses?
Just why do seahorses look like horses? Helen Scales explains why their equine-looking head makes them stealthy ambush predators
Do fish pee?
how do fish get rid of waste products? Do fish pee? We take a look at a fish's urinary system
Do fish sleep?
Wondering if fish sleep? It's not a simple yes or no answer says Stuart Blackman after weighing up the evidence
Weirdest fish: 12 of the strangest fish in the world
Our seas are brimming with strange and wonderful creatures. Meet 12 of the weirdest fish in the world, which sport everything from super-long noses to golfball heads
Why do some fish have fat lips?
Just why do some fish have fat lips? Stuart Blackman takes a look at the evidence
Why pufferfish are so poisonous and how they avoid poisoning themselves
Helen Scales takes a look at the highly poisonous pufferfish
How an electric eel works: You wouldn't want to be on the receiving end of its high voltage charge
Did you know electric eels can produce a hefty shock of 600 volts if needed? Matt Doggett take a look at how and why electric eels produce electricity
What's the fastest shark in the world?
Did you know the fastest shark in the world can reach speeds of 70km per hour? Pretty impressive...
Fish that can walk on land evolved the ability to blink like we do
Scientists have discovered that mudskippers – fish that breathe air – probably blink for the same reasons as humans
Do fish make friends?
Why for one species of fish a best friend is crucial for survival
Bullhead fish: what they are, what they look like - and how males entice females by singing
Did you know bullhead fish can sing? Yes really if love's around ... Nick Baker takes an in-depth look at this fascinating fish