Fish
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
Blue shark facts: size, diet and what they look like
Learn all about the beautiful blue shark
Where and when to see leaping salmon in the UK
Get settled by the water's edge this autumn and marvel at Atlantic salmon bravely leaping homewards to reproduce.
How do 'flying fish' fly?
Just how do 'flying fish' appear to soar through the air? Helen Scales explains
Steve Backshall on shark attacks: “You’re more likely to be killed taking a selfie”
Naturalist and shark enthusiast Steve Backshall on the latest shark attack information
Damselfish behaviour is influenced by rats
Loss of seabirds through rat predation affects reef fish hostility and could have wider impacts
Why do females often live longer than males?
Female animals tend to live longer their male counterparts, but why?
What is a lamprey and where do they live?
Nick Bake explores the life of the lamprey