With the emergence of a relatively independent aquaculture industry, a powerful industrial sector has begun to differentiate, that is, all kinds of aquaculture input industries serving aquaculture and production, including the production of machinery, equipment, veterinary drugs, compound feed, and the processing industries of various aquaculture products, such as meat processing industry and milk processing industry. Therefore, aquaculture in a broad sense often includes agro-industrial joint enterprises that serve it, such as various livestock and poultry companies, joint livestock and poultry companies, and compound feed companies. In many developed countries in the world, regardless of the size of land area and population density, aquaculture is very developed. Except for Japan, the output value of aquaculture accounts for more than 5% of the total agricultural output value, such as 6% in the United States, 7% in Britain and 8%-9% in some Nordic countries. Since 198s, the growth rate of aquaculture production in China has far exceeded the world average, and the per capita output or output value of aquaculture is still lower than the world average. The main ways to develop aquaculture include: adjusting the structure of aquaculture according to local conditions, opening up feed sources, improving livestock species, strengthening feeding management, preventing diseases and improving the productivity of unit livestock; At the same time, increase the number of livestock.