鱼 (yú) is the Chinese word for "fish." Fish are aquatic animals that live in water, including oceans, rivers, and lakes. They have gills for breathing and fins for swimming. Fish come in various shapes, sizes, and colors, and they play a vital role in many ecosystems. In addition to being an important part of the food chain, fish are also a popular source of food for humans. Many cultures around the world enjoy eating fish, and it is often featured in traditional dishes. Fish farming, or aquaculture, is a growing industry that helps meet the demand for this protein-rich food.