Fische, or fish in English, are aquatic animals that live in water, including oceans, rivers, and lakes. They have gills for breathing, fins for swimming, and scales covering their bodies. Fish are an essential part of many ecosystems and play a crucial role in the food chain. There are thousands of fish species, ranging from small goldfish to large sharks. Fish can be categorized into two main groups: bony fish, which have a skeleton made of bone, and cartilaginous fish, which have a skeleton made of cartilage. Many people also enjoy fishing as a recreational activity or consume fish as a source of protein.