Dakoujiao is a kind of fish gum of the family Lithopodaceae, whose cost performance is second only to that of Beihai double-backed gum. It is mainly produced in Indonesia, and its tubular and flaked forms are the most common. Many merchants also call it "big mouth and red mouth", which is actually not accurate. In principle, it can only be regarded as a close relative of the red mouth, and it is a low-middle version of the soil plaice.

north sea with pointed tail is one of the best varieties in the north sea. Moreover, when choosing a pointed tail, we must pay attention to the kind of rubber meat that is tight and firm, soft, clear in soup, and has no fishy smell. The difference between the two coarse meats is that they are small and long.