Longli fish, commonly known as "dragon tongue fish", is not a fish with high nutritional value. However, it contains a substance called omega-3 fatty acid, which can inhibit free radicals in the eyes and prevent the formation of new blood vessels; It can also reduce the occurrence of lens inflammation, which has a good health care effect for people who watch computer screens for a long time, so it is also called "eye protection fish". Brief introduction of Longli fish. The real Longli fish is actually expensive, especially Cynoglossus semilaevis, which is a superior product and expensive. However, the so-called Longli fish, which we usually eat at a lower price, is Basha fish from Southeast Asia. Because of its tender meat, delicious taste, no small thorns between muscles, it is conducive to processing. It is also called "Longli Fish" in China, but its nutrition and taste are very different from those of Cynoglossus, and even its nutrition is not as good as that of grass carp we usually eat. There are many studies on the nutrition of Basha fish in Europe. After polyphosphate treatment, the water content is over 80%, and the protein content is low. The most fat content is saturated fatty acid, followed by monounsaturated fatty acid and polyunsaturated fatty acid.