- Swimming: Fins provide the thrust that allows fish to move through the water. Different types of fins have different functions, such as the pectoral fins, which are used for steering, and the caudal fin, which is used for propulsion.
- Protection: Scales protect fish from predators and other hazards in the environment. They are made of a hard material called keratin, which is also found in human nails and hair.
- Thermoregulation: Scales help fish to maintain their body temperature by providing insulation. Fish that live in cold environments have thicker scales than fish that live in warm environments.
- Sensing: Scales contain sensory cells that help fish to detect changes in their environment, such as temperature, pressure, and salinity.
- Communication: Some fish use their fins and scales to communicate with each other. For example, some fish will flash their fins to warn other fish of danger.
Without fins and scales, fish would not be able to survive in their environment. They would not be able to move, protect themselves, or regulate their body temperature. Fins and scales are essential for the survival of fish.