The ocean is full of fish, so much so that they make up the second ... the coral reef ecosystems would be overgrown with algae, lots of people would run out of food to eat, and we would lose ...

Look at all these fish! Big fish ... They must have to eat a lot! They can stay underwater for an hour, but come to the surface to breathe. So, ocean habitats are large and wet.

Look at all these fish! Big fish ... They must have to eat a lot! They can stay underwater for an hour, but come to the surface to breathe. So, ocean habitats are large and wet.

There are lots of fish in the sea, and we haven't snagged 'em all yet! Stick around as we continue to update this list.

Plastic is building up in the areas of the ocean where fish feed and grow ... they were surprised to find lots of plastic in the nets. "It was completely unexpected," said Dr Williams.