"freshwater fish" 的定义和意义

What is "freshwater fish"?

Freshwater fish refers to a diverse group of aquatic vertebrates that inhabit freshwater environments such as rivers, lakes, and streams. They are a crucial part of many aquatic ecosystems and are important sources of food for humans and other animals. Freshwater fish come in a wide variety of shapes and sizes, with adaptations that allow them to thrive in their respective environments. Some species, such as salmon and trout, are known for their migratory behavior, while others, like catfish and carp, are bottom-dwellers. Freshwater fish are also popular in the aquarium trade, with many colorful and unique species available for hobbyists to keep and admire.