Although fish share two key traits (they all live in water and are vertebrates), their colour, shape and character vary significantly. Salmon for instance have gills and reproduce by laying eggs. Eels have long, snake-like bodies and very slippery skin and Whale Sharks can grow up to 14 metres long and swim at only 5kph. While most fish are cold-blooded, some larger swimmers like sharks and tuna can regulate their body temperature to swim in shallower waters.
Currently, 1,414 species of fish, or 5% of the world's known species, are at risk of extinction. This is due to overfishing, habitat destruction and pollution. To help save our fish species, always take your rubbish home from the beach, never release balloons in the sky and recycle your plastic as much as possible.