Fish
Fish are a kind of animal that lives in the water. There are many different kinds of fish. Fish usually have scales and fins. They live in fresh water in lakes and rivers and in salt water in the ocean. Some fish are less than one centimeter long. The largest fish is considered to be the whale shark, which can be almost 15 meters long and weigh 15 tons.People eat many kinds of fish. The fish that people eat include carp, cod, herring, mullet, sardines, tilapia, and tuna.
Most kinds of fish have bones. Some kinds of fish, such as sharks and rays, don't have real bones. Some scientists say that these are not real fish, but most people call them fish. Some other animals that live in the sea, such as starfish and jellyfish, are called fish but are not really fish.
The word fish is also used for the activity of catching fish. People catch fish with small nets from the side of the water or from small boats, or with big nets from big boats. People also catch fish with fishing poles and fishhooks.