A fish (plural: fish or fishes) is a kind of animal that lives in water, and breathes the oxygen in the water instead of air using gills, which are special flaps that let them breathe in 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 and fish.
People eat many kinds of fish. The fish that people eat most include carp, cod, herring, perch, sardines, sturgeon, tilapia, trout, tuna, and many others. Some people keep fish as pets. Goldfish and Siamese Fighting Fish are popular types of pet fish. They are often kept by groups of people in public ponds for their beauty and calming nature.
Bony and cartilagenous fish.
Most kinds of fish have bones. Some kinds of fish, such as sharks and rays, do not have real bones (their skeletons are made of cartilage) they are known as cartilagenous fish. 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 "to 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 can also catch fish with fishing poles and fishhooks with bait. This is often called fishing. there is also different types of lures that can be used. one is a crank bait. others are like plastic worms and rat-l-traps. these are ways of catching fish.

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