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These include tropical fish, coldwater fish, marine fish and freshwater fish. Tropical Fish. These are the fish that live in either freshwater or saltwater but they need warm or tropical medium or temperature to thrive. Many types of tropical fish are popular aquarium fish because of their bright colors.
Most fish that can only tolerate narrow ranges of salinity and are highly sensitive to any changes in the levels of salt to the water in which they dwell. These fish are known as stenohaline species and include goldfish, which can live only in a freshwater environment. Reversely, tuna can exist exclusively in saltwater, according to the NMFS.