[Fat and fatty acid content in freshwater and saltwater fish in 4 provinces].

There are certain differences in the fatty acid composition between freshwater and saltwater fish. Saltwater fish have a higher percentage content of SFA, while freshwater fish have a higher percentage of MUFA, but there is no difference in the absolute content of SFA and MUFA. The PUFA composition also varies. The composition of PUFA also shows certain differences between the two types of fish. In freshwater fish, the contents of linoleic acid and alpha-linolenic acid) are relatively high, whereas in saltwater fish, the contents of EPA and DHA are higher. In freshwater fish, the PUFA primarily exists in the n-6 form, while in saltwater fish, the PUFA is mainly in the n-3 form.