1. Gills for Respiration: Fish breathe underwater using gills, which are specialized organs that extract oxygen from the water and release carbon dioxide. This adaptation is essential for their survival in an aquatic environment.
2. Streamlined Bodies: Most fish have streamlined bodies, which are shaped to reduce water resistance. This allows them to move through water efficiently, conserving energy while swimming and escaping predators.
3. Scales and Slime: Fish have scales that provide protection from predators and parasites. Additionally, many fish produce slime that coats their bodies, reducing friction and helping them move through the water more easily. The slime also helps to prevent infections.