Grass carp growing in Hangzhou West Lake. Yu Yue, who cooked vinegar fish in West Lake, was a scholar in Qing Dynasty. The exclusive formula of Yuyue is: firstly, starve the grass carp in the West Lake for two or three days, spit out silt, purify the intestines, kill and cook now, and keep it fresh. According to the legend of Sister-in-law of West Lake vinegar fish, Sister-in-law Song, the first to make vinegar fish in West Lake, was a fisherman on the West Lake, and the raw material was grass carp in the West Lake. The book "China Famous Cookbook Zhejiang Flavor" is a recipe for vinegar fish in West Lake, and the raw material is grass carp. According to the recipe, the West Lake vinegar fish finally presents the tender taste of crab meat, which carp may not be able to do. On July 12, 2023, Box Horse released a series of box horse fresh aquatic products conditioning dishes in Hangzhou. The first consignors are chilled fish such as crucian carp, mandarin fish and perch, and then semi-finished products such as fish fillets will be introduced for food and hot pot for one person. Liu Shengbing, director of the national aquatic product procurement of Boxma Baoxian, said that the fish used in the series of aquatic products prepared by Boxma Baoxian had undergone "special treatment". In cooperation with Guangdong Heshi Aquatic Products and Foshan Institute of Science and Technology, Box Horse has developed a set of aquaculture and processing technology that can effectively remove the fishy smell for seven months. Among the first batch of online products, there are 9 kinds of freshwater fish, including grass carp, which is hotly discussed in Hangzhou this year. In April last year, "West Lake vinegar fish is going to change fish" boarded a hot search. Because many netizens think that the West Lake vinegar fish is too fishy, some famous restaurants in Hangzhou decided to replace the traditional main course of this dish with Quzhou civilized freshwater fish. Jin Ou, general manager of Box Horse Hangzhou, said that due to the high attention of grass carp in Hangzhou this year, we took the lead in launching Box Horse Baoxin Grass Carp in Hangzhou and conducted a 10-day local user evaluation. The results showed that 94.3% of the users gave feedback, and the grass carp Boxmabaoxin not only had no earthy smell, but also had smoother meat than ordinary grass carp. It is understood that the fishy smell of freshwater fish mainly comes from two aspects: first, the breeding environment; Secondly, fish produce stress reaction in the process of culture and transportation. Therefore, the key to fish deodorization is to improve the breeding environment and reduce the possibility of stress. After thousands of experiments and tests, the R&D team of Box Ma Baoxian has developed a temporary feeding system that can successfully remove the odor of freshwater fish, and the system has also obtained two national patents. By controlling the water circulation and water temperature, the fish in the temporary culture pond can gradually adapt to the low temperature environment, maintain their vitality and reduce stress reaction while discharging the soil odor in their bodies. The fish temporarily raised in this system can not only remove 85% of the earthy smell, but also keep the meat fresh and tender after standardized cleaning treatments such as bloodletting, soaking cleaning and plant deodorization.