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In traditional sea cage fish farming, small fish and shrimp caught from the sea are generally used. After simple processing, they are directly fed to farmed fish. This approach, from the perspective of economic benefits, nutrition, disease prevention, has obvious shortcomings: (1) The price is high. As a result of long-term overfishing and overfishing, there has been a serious shortage of offshore fishery resources, and the number of catches has declined. The price of small fish and shrimps has also continued to increase. In addition, the small shrimps that are harvested have a large amount of water, and they require a lot of manpower and resources for feeding (such as meat grinders, diesel engines, etc.), and they are very wasteful when they are put into cages. Increase the cost of fish farming. (2) Feeding small fish and shrimp and analyzing it from the aspect of nutrition is not comprehensive. There are many species in sea cages, and their diet is also very different. The nutrients such as protein, fat, carbohydrates, minerals, and vitamins are also different. It is difficult to satisfy them with a single small fish and shrimp. Nutritional needs. Experts have found through investigation that incomplete nutrition can cause fish to grow slowly and even cause certain diseases. (3) From the perspective of disease prevention and control, farmed fish directly eat small fish and shrimp caught in the ocean, which is very easy to get sick. Small fish caught in the ocean may have pathogens of one kind or another. These pathogens are eaten by the farmed fish and will affect the health of the fish. This may cause an outbreak of fish diseases, resulting in a large number of farmed fish. death. Other small fish and shrimp that have not been eaten sink into the bottom of the cage, causing aquaculture water pollution, which in turn can lead to outbreaks of fish diseases. The development of seawater cage culture and the use of high-tech artificial feeds are the current domestic and international trends. Compared with small fish, shrimp, etc., artificial compound feed has the following obvious advantages: (1) formula science, nutrition and comprehensive. Formulated feeds are scientifically formulated based on the growth characteristics of the fish. They were designed to take into account the need for protein, fat, sugar, minerals, and vitamins, and other nutrients in farmed fish, thus ensuring the rapid growth of fish. (2) Convenient feeding and labor saving. When the compound feed is fed, it does not need to be processed like feeding small fish and shrimp, and the feed can be directly fed after the feed is taken out, and the required amount is only about one tenth of the small fish and shrimp, which greatly reduces labor intensity. . (3) It is good for absorption and reduces the incidence. In the production process of compound feed, it is generally cured and the fineness of raw material powder is high, which facilitates the digestion and absorption of fish and greatly improves feed utilization efficiency. At the same time, in the process, many pathogens were killed and the possibility of morbidity was reduced. (4) Supply is stable and easy to save. The supply of small fish and shrimp is affected by many natural factors, especially during the fish rest period, and its supply is difficult to guarantee. These instability factors must be taken into consideration in the breeding process. The compound feed can overcome the above unstable factors. In addition, the compound feed is dry granules or powder, it is very convenient to save, unlike the small fish and shrimp, it must be frozen when it is used up. (5) Protect the environment and reduce pollution. When the minced small fish shrimps are fed, some of them will sink to the bottom of the sea, causing pollution of the water body, and the compound feed can largely be avoided.