Judging from their place of life in nature, fish can be catagorized as freshwater fish, seawater fish, brackish water fish and Euryhaline fish. Freshwater fish are fish that live in freshwater environments such as river and lakes. Seawater fish is a type of fish that lives in the sea while brackish water fish is a type of fish found living in river estuaries and coastal areas. But there are also fish that can live in 3 types of water, namely living in fresh water, sea water and brackish water. Fish that can live in 3 types of water are called Euryhaline fish. An Example of a type of Euryhaline fish is the Round goby. Archocentrus octofasciatum fish, also known as Jack Dempsey fish, is a type of freshwater fish that lives in rivers that have slow currents. It can be found from southern Mexico to Honduras. Fish hobbyists who have a collection of ornamental fish at home can choose this type of freshwater fish to be used as pet fish. Archocentrus octofasciatum fish that will be kept a...