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Freshwater fish are fish that spend part or all of their life in fresh water, like rivers and lakes, with salinity less than 0.05%. In many cases the environment is different from the surrounding waters, and the most difference is the salinity. To survive in fresh water, fish require physiological adaptation that seeks to maintain the equilibrium concentration of ions in the body.

41% of all known species of fish in fresh water. This is because fast species habitat decentralized makes it possible to live.

Freshwater fish with different physiological salt water fish in several aspects. Gill they must be able to take care while diffusion water salinity in the body fluids simultaneously. Adaptation on the fish scales also play an important role; freshwater fish scales will have lost a lot of excess water diffusion into the skin, and can cause death in fish.

Other features related to the kidney of freshwater fish that grow well. Kidney large freshwater fish as much water through it.

Many species of freshwater reproducible but spent most of his life at sea. They are known as androgynous fish, including salmon, trout, and stickleback. Some fish, in contrast, was born at sea and live in fresh water, such as eels.

emigrate species between seawater and freshwater adaptation needs in both environments. While in the sea water, they must keep their concentration of salt in the lower body from the environment. Meanwhile, while in fresh water, they must maintain the concentration of salt in the neighborhood. Many species solve this problemĀ  with different habitats at different stages of life. Eel, salmon nation, and lamprey have salinity tolerance at various stages of their lives.

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