1, fish pond construction: dig a fish pond in the greenhouse, the depth of the pond is two meters, the bottom and the wall of the pond must be compacted, a layer of 30cm thick fertilizer mud should be laid on the bottom, and a layer of plastic film should be laid around the edge of the pond. There should also be water inlets and water outlets on both sides of the pond. The height of the water inlet must be higher than the water surface of the pond, and the water outlet should be located at the bottom of the pond. Nylon nets should be installed at the water inlet and water outlet to prevent the entry of foreign matters. A fish ditch with a length of two meters, a width of 0.5 meters and a depth of 0.3 meters should be dug at the bottom of the drain to facilitate the capture of loach and use it for summer. After the fish pond is completed, it needs to be filled with 10 cm of water. Each mu of fish pond needs to be filled with 80 kg to 100 kg of quicklime and then sprinkled to disinfect the bottom of the pond. About ten days later, 50 kilograms of water will be pumped into the fish pond, and then two kilograms of urea will be applied per mu to cultivate fertile water quality. After three days, urea will be applied again. When a large number of brown diatoms can be seen by the pond, when the color of fresh water is yellowish brown and the transparency is about 30 centimeters, loach seedlings can be released.

2, fry stocking: Misgurnus anguillicaudatus fry must be disease-free and undamaged, healthy and lively. Before stocking loach, it must be dipped and disinfected. It can be dipped and disinfected with salt solution containing 2% to 4% for 10 minutes, and the density is finally about 2 to 3 kg of loach seedlings per square meter of water. With the continuous increase of stocking quantity and the constant change of fish weight, the water in the pool can be deepened to 0.7 meters.

3. Feeding bait: The loach mainly eats natural bait for about half a day, and it can be supplemented with some fish meal, bean cake and bait appropriately, and the feeding amount can account for 2% of the body weight. When the loach grows to 5 cm in the first half of June, it can be fed with some carp and feed, and the daily feeding amount can account for 5% of the body weight in June and 10% in July and August. When feeding, it is necessary to put the bait near the food table.

4. Adjustment of water quality: When cultivating loach, the color of water quality is best yellow-green, the transparency can be maintained between 20 cm and 25 cm, the PH value is around 7.5, and the oxygen degree is best above 2 mg per liter. From July to August, the depth of the water is preferably above 80 cm. When the color of the water is found to be too strong, it is necessary to change the water in time. Generally, the water can be changed once every ten days, and the water needs to be changed by 30 cm each time. In the high temperature season, some aquatic plants, such as some water peanuts and water hyacinths, can be transplanted in the pool, and a shade shed needs to be built above the pond for shade.

5. Greenhouse management: In winter and sunny days in early spring, the straw covered in the plastic shed can be removed, and the rest of the time, the plastic film in the greenhouse is removed, and aquatic plants such as water peanuts are planted in the pool to shade the sun. In autumn and late spring, the plastic film is covered, and the straw mat is covered in the film at night.

6, disease prevention and capture: breeding loach should try to prevent disease as early as possible, and treat disease as early as possible. Sprinkling quicklime and bleaching powder in the whole pool regularly can improve water quality and prevent fish diseases, and at the same time, timely remove water snakes, water rats and other enemy organisms in the loach pool. At the end of autumn and the beginning of winter, when the water temperature drops to 10℃ to 15℃, the loach's food intake will be reduced, so it can be caught. Generally, the method of draining the pool water and artificially lowering it into the pool is used to catch it.