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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.
Ray-finned fish constitute the largest class of vertebrates, including nearly 25000 marine and fresh-water species. According to WoRMS there are 57 orders of marine species. Ten of them are presented here.