What is the function of scales on fish?

Protection:

* Physical barrier: Scales act as a tough, protective outer layer, shielding the fish from predators, parasites, and the environment.

* Abrasion resistance: They help protect the fish from damage caused by rubbing against rocks, plants, and other objects.

* Infection prevention: The scales provide a barrier against bacteria and fungi.

Hydrodynamics:

* Streamlining: The smooth, overlapping nature of scales reduces friction, allowing fish to move through water more efficiently.

* Maneuverability: Scales contribute to the flexibility of the fish's body, enabling it to make quick turns and changes in direction.

Camouflage:

* Coloration: Many fish have scales that are colored or patterned to help them blend in with their surroundings.

* Reflective properties: Some scales are iridescent, reflecting light in a way that makes the fish appear different depending on the angle of view.

Other functions:

* Sensory perception: Some scales contain sensory receptors that help the fish detect changes in water pressure, temperature, and currents.

* Osmoregulation: Scales can help regulate the fish's internal salt balance.

* Thermoregulation: Some scales can help regulate body temperature.

The specific functions and characteristics of fish scales vary depending on the species of fish and its environment.