Fish

Fish are aquatic vertebrate animals that live in oceans, rivers, lakes, and other bodies of water. They represent one of the most diverse groups of animals on Earth, with thousands of known species adapted to many different environments.

Most fish breathe through gills, which allow them to take oxygen from water, and many species have fins that help them move and maintain balance. Their bodies are often covered with scales that provide protection, although some fish have different types of skin coverings.

Fish play important roles in aquatic ecosystems. They can be predators, prey, or both, depending on their species and their place in the food chain. Some fish feed on plants and algae, while others eat small animals or other fish.

They contribute to the movement of nutrients between different parts of aquatic environments and support the survival of many other organisms. Humans depend on fish for food, scientific research, and economic activities such as fishing. However, many fish populations are affected by pollution, habitat destruction, and overfishing, making the protection of aquatic environments essential.