Book excerpt: Table of Contents Introduction What are fish? What do fish eat? How do fish breathe? What Fish look like Fish and each other What do fish do? Saltwater versus freshwater fish A White Marlin; a salt water fish Pike is a freshwater fish Sharks Goldfish Marlins Lungfish Mud skippers Coelacanths Eating Fish Conclusion Publisher Introduction There are more fish in the world than any other animal. The word "fish" use to mean anything that swam so frogs, beavers, alligators, etc. There are still many animals that are called a fish, from lungfish to sharks.