The body of a fish is covered by scales, which are thin, bony structures that serve as a protective armor. The scales overlap each other and create a tough, flexible outer layer that helps to prevent injury from predators or the environment. In addition to providing protection, fish scales also help to regulate water and salt balance by creating a barrier between the fish's body and its surroundings. Some fish, such as sharks and rays, have a different type of skin covering called dermal denticles, which are similar to scales but have a more tooth-like appearance.
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