Salmon is not only a large-scale precious specialty fish in Heilongjiang Province, but also one of the rare freshwater fish in China. Its meat is delicate, red, delicious, rich in fat and high in nutritional value. The protein content is 14.9- 17.5%, the fat content is 8.7- 17.8%, and the moisture content is 6 1.4%. Every100g contains 1384 calories. In addition, it also contains sugars and multivitamins. Its eggs are crystal clear, pearl-like, rich in phosphate, calcium and vitamins A and D, and are recognized as a feast. Salting it into "salmon seed" is the "red fish seed" which is famous in the international market and is very popular in Europe and America. Hezhe people living in Heilongjiang province also use salmon skin to make leather clothes, long boots, cigarette packs and wallets. The meat, liver, testis and head of salmon have medicinal value. Its meat has the effects of tonifying deficiency and fatigue, strengthening spleen and stomach, warming stomach and regulating middle energizer, and can be used to treat edema, emaciation, dyspepsia, bloating, vomiting, acid water, convulsions, swelling and sores. Fish liver can be used to extract cod liver oil. Protamine can be extracted from testis and made into various protamine preparations, which are suitable for treating the reaction caused by excessive injection of heparin. It also has obvious hemostatic effect on some hemorrhagic diseases (such as acute upper gastrointestinal bleeding, hemoptysis in the lung, etc.).