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Rainbow trout has the characteristics of delicious meat, rich nutrition, less thorn meat, high food value, rapid growth, and easy artificial reproduction. Rainbow trout is a cold-water fish, which is named after a rainbow-red vertical pattern along its lateral line. Its living water temperature is 2-25 °C, and the optimum water temperature is 12-20 °C. It has high requirements for dissolved oxygen in water, but it has strong adaptability. It can be cultivated in ponds and also suitable for stocking in reservoirs, lakes and rivers. Especially in running water, can grow all year round, the yield is very high, generally 667m2 (1 a) production 30,000 - 350,000 kilograms. Therefore, the artificial breeding of rainbow trout is very attractive. Its breeding technology is: First, the construction of fish farms. Wherever the annual water temperature is maintained at 7-20°C, dissolved oxygen is above 5 mg/l, pH is 6.5-8, and the water quality is fresh, rainbow trout farms can be built. The terrain requires a certain slope in order to facilitate the drainage and drainage. At the same time, the drop in water is also conducive to natural oxygenation. Medium-sized and small-scale breeding farms, with an area of ​​0.5 to 20,000 m2. The area of ​​each eel pond is up to 200m2. The cement structure has a length and width of 25m 4m to 30-60m and 5m to 8m. This facilitates feeding, management and control of fish diseases, and allows the water to flow evenly to the pool. In various places, it meets the characteristics of rainbow trout. There are two types of injection and drainage outlets in the fish pond: one is the inlet and outlet equivalent to the width of the fish pond, and the gate is from top to bottom, and the whole section is kept over water. This form is suitable for large-scale fish farms; The inlet width is only about 1/5 of the tank width, and the outlet width is 1/2 of the tank width. At the same time, in order to prevent the wild fish from entering the fish ponds and pool fish from escaping, fish traps should be set at the inlet and outlet. The rearing ponds are arranged in parallel pools and series pools, and they can also be combined. However, it is better to use concatenated fish ponds for convenient management and labor saving. If the fish pond is built on the mountain, the aquarium can be like a terraced field. It is stratified down one level and the water from the upper level pool flows into the next level pool through a small gate to keep the water flowing. Second, adult fish rearing. Adult fish rearing begins with the rearing of 50 grams of fish. Stocking density per m210-15, water depth 1-2 meters. In feeds, animal feeds account for 30%-40%, and plant feeds account for 60%-70%. Animal feedstuffs include fishmeal, meat powder, small trash fish, cocoon and poultry, and the internal organs of livestock. Botanical feeds include dried cake powder, bran, bran, and lettuce leaves. Particle size to palatability, generally suitable diameter of 4-8 mm. Feeding twice a day, the feeding amount is 2%-3% of the total weight of the fish, which can be flexibly controlled according to the weather, water temperature, and fish appetite. Generally do not feed too much under close-knit conditions, so as not to pollute the water quality and kill the adult fish. In order to achieve high yields of fish, the management must first maintain enough water and sufficient dissolved oxygen. For this purpose, additional oxygen-increasing equipment should be added to the fish ponds. Once oxygen deficiency occurs, supplement them immediately. In addition, the fish that have reached the food standard should always be sold in time for sale, and individuals with significant differences should be selected and kept in separate ponds.