The whale shark is the  largest fish in the sea. Despite its size, it is gentle and feeds mainly on plankton.

The basking shark swims  with its mouth wide open  to filter tiny food particles from the water.

Known for its powerful  jaws, the great white  shark is one of the most feared predators in the ocean.

Tiger sharks are known  for their stripes and their willingness to eat almost anything.

The ocean sunfish looks  like a giant floating head  and can grow as tall as it is long.

Manta rays are gentle  giants that "fly" through  the water with their large, wing-like fins.

The beluga sturgeon is  one of the largest  freshwater fish and  can live for more than 100 years.

The Greenland shark  can live for over 400  years, making it one of the longest-living vertebrates.

The white sturgeon is  known for its large size  and can live up to 100 years.

The alligator gar has a  long, snout-like mouth filled with sharp teeth, resembling an alligator.