Commonly known as barbless fish are chinook salmon, alias cow tongue, sole. There is also balsa fish, alias roe boarder, sole, sole rice. There are also dragonfish, sturgeon and squid. Spineless fish are fish that have no spines in the fillet except for one main spine, which is suitable for the elderly and children.

Dragon sole belongs to the plaice order, tongue sole family, tongue sole genus, commonly known as the sub plate fish, sole, sole rice, is a warm temperate offshore large demersal fish, year-round life in the Chinese offshore sea area, with a wide range of temperature, salt and adapt to the changing environmental conditions of the characteristics of the temperature range of 3.5 ~ 32 degrees Celsius, the optimal water temperature of 14 ~ 24 degrees Celsius, the salt range of 14% ~ 33%. Half-smooth tongue sole has few natural resources, fresh taste, high meat rate, smooth texture, fish meat cooked for a long time without old, no fishy taste and odor, belongs to the high protein, rich in nutrients, traditionally for the majority of consumers along the coast of China's hospitality to the guests of the finest, favored by the majority of consumers, the price of live fish is very high. In addition, half-smooth tongue sole grows fast, low food level, can tolerate low oxygen, less disease, suitable for breeding turbot, turbot in the greenhouse.