They may look small but Pufferfish are actually pretty tough. Nobody should try to eat them as they are one of the most poisonous fish in the sea and they have a few other tricks up their…fins...

The fast swimming European Eel tells us about their journey from the Atlantic Ocean to European rivers where they stay until they are big enough to return to the sea.

The shy Stingray shows us how she hides to catch her food. She tells us that they are related to sharks but very different all the same.

The nocturnal Pineapple fish shows us how they glow in the dark to attract their prey.

The tropical Frogfish shows us how they walk across the sea floor and what they do to stay out of harms way.

Mudskipper is determined to make sure everyone knows he is a fish. He show us how their bodies are designed for them to breath outside of the water and how their arms allow them to sip along the shore.

In the waters of South America we meet the misunderstood Piranha who explains that they are more than just scary monsters as the films make them out to be.

At the bottom of the river we meet the Catfish who ,with his bony, flat head, is a very successful bottom feeder.

In this episode Crab sideways walks in to tell us that there are nearly four thousand species of crab like him coming from far and wide and living in both the water and on land.

The Butterfly fish takes some time out from being seriously good looking to tell us all about how they peck at coral with their long snouts for food and how he uses these good looks to confuse and camouflage himself to evade predators.

The Sawfish wakes up from his sleep to show us all of the uses for his saw shaped nose, including; catching food, digging and defending himself.

The aggressive and pushy Lionfish shows us what he's made of and why few fish would dare to mess with them and to those that would, he's a kitten.

We meet Goldfish in his tank, where he shows us where he came from and he explains their three month memory and unique ability to see in colour. Goldfish explains they are social animals who love much bigger spaces.

Jellyfish shows us how they catch their prey and fend off predators using their stinging tentacles and can see their food after they eat it because of their see-through bodies.

We meet the Angler Fish who lives in the deepest, darkest parts of the ocean. She shows us how they’re the only ones who catch food using a bright Lure which hangs from the top of their spine.

Giant Clam explains what they eat that help them to grow from being very tiny clams to giant ones. They also have a very effective defense mechanism that has helped them to live for up to 100 years

We meet the shy Boxfish hiding in the reefs near Australia. She explains their unconventional shapes, sizes and what they like to eat. Despite her peaceful nature, she still has all sorts of creatures after her - so it's a good thing she's got her poison to protect her.