For most fish, fish scales are very important. It can provide protection for fish from some attacks. At the same time, the special structure can also allow the fish to reduce friction when swimming, so that they can have a faster speed. In addition, the scales of the fish belly part can reflect light, which can play a camouflage role and prevent the aquatic animals under the water from attacking. And it can prevent the inflow or outflow of water bodies.
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For fish, fish scales are a skin derivative, which is calcareous in itself, and usually covers the whole body, and some only cover part of it. It acts like an exoskeleton and can provide some protection. When they encounter some more aggressive fish, even if they are attacked, they are not easy to be injured, but for larger aquatic animals, the protective significance of fish scales is much smaller.
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Fish scales are not only attached to the surface of the fish body, their own structure is also very special, and people think that the smooth is different, its surface has some concave holes, although it will produce additional pressure resistance, but at the same time will reduce friction resistance, and ultimately can play a role in reducing resistance, can make the fish swim faster, which is conducive to its predation or escape the pursuit of predators.
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The scales on the belly of the fish can reflect and refract bright light, just like a mirror, the ferocious aquatic animals living under the water will feel dazzling after seeing it, so that they cannot accurately find the location of the target, which is also a natural camouflage for fish, which can avoid some dangers.
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For freshwater fish, due to the relationship of osmotic pressure, the water body will infiltrate into the fish body, and the scales can play a certain obstructive role, preventing the water from entering too quickly and swelling the fish to death. Similarly, in the seawater, the water in the body will continue to flow out, and the scales of the fish can play an obstructive role, which is also a kind of protection for the fish.