How do fish scales stay on fish?

* The shape of the scales. Fish scales are typically thin, flat, and overlapping, which helps to create a strong bond between them. The scales are also often serrated, which helps to lock them together.

* The mucus that covers the fish. Fish produce a mucus that helps to keep their scales moist and flexible. This mucus also helps to create a barrier between the scales and the water, which helps to prevent infection.

* The muscles that attach the scales to the fish's body. Fish scales are attached to the fish's body by a network of muscles. These muscles help to keep the scales in place, even when the fish is moving quickly through the water.

In addition to these factors, the size and shape of the fish's body can also affect how well its scales stay on. For example, fish with large, flat bodies, such as flounder and halibut, typically have scales that are larger and more firmly attached than fish with small, round bodies, such as trout and bass.

If a fish loses a scale, it can usually regenerate a new one. However, if a fish loses too many scales, it can become more susceptible to infection and other health problems.