Sea Fish. According to the official website of BioScience, yellow croaker belongs to the marine fish, is a saltwater fish. Abbreviation "yellowtail", the scientific name of the "stonehead fish", is a more common species of marine fish, the Bohai Sea is produced in particular. Broadly speaking, the fish that can live in freshwater with a salinity of three thousandths of a degree can be called freshwater fish. In a narrower sense, it refers to part of its life history, such as only the juvenile or adult stage, or its whole life must be in the freshwater through the fish.