An interesting and fun fish fact for kids is that there are over 3000 known species of fish. Their bodies are covered with slimy scales that help to propel them through the water. Some fish, such as tuna, can swim up to 43 miles per hour.
Seahorses are the only fish that can swim upright. While fish don’t have vocal cords, they do emit a variety of low-pitched sounds to communicate with each other that include moans, grunts, whistles, booms, shrieks and wails. They make these sounds by using different parts of their bodies, such as vibrating their muscles against their swim bladders.
Some fish travel in schools, which can sometimes contain a million fish. They use both their eyes and a lateral line of pores that run along their sides from head to tail to help them maintain their place in the school. Most fish have taste buds all over their bodies, and sharks are the only fish that have eyelids.