Friendly reminder: as a single feed, earthworm is not very profitable and is easily limited by market conditions. The market for direct selling is limited, and a large batch is generally required, which is difficult for ordinary farmers to meet. A relatively simple way is to transform the cultivated earthworms into eels and loaches, and then sell the special aquatic products directly to the local market. Not only can we reduce the cost of breeding, but also we don't have to worry about sales. Most of them can be digested as raw materials for auxiliary feed. Beginners can take part in Zhou Wenzong's soilless ecological farming technology training course for eel loach (training content: still water soilless farming for eel loach in impervious membrane pool, early sowing in cage for wintering, and eel loach growing with vegetables and fruits in the same pool), and receive industrial chain supply guarantee services such as "seedling supply+feed supply+fishery medicine supply+impervious membrane supply" to minimize entrepreneurial risks.