1. The selection and clearing of fry ponds: The area is suitable for 2 to 3 mu, requiring fresh water sources. The fish ponds should be carefully inspected and refurbished before use, and the ponds should be completely disinfected. Clearance of clear ponds is an important measure of fry cultivation and must not be neglected.
2. Shi Jian Fei: Fish fry 3 to 5 days before the pool, add 50 to 70 centimeters of fresh water to the pond (to prevent wild fish and harmful organisms from entering the pool), and apply base fertilizer. Usually 200-400 kg of fermented livestock manure per acre, diluted with water, evenly spilled, can also be applied non-toxic green manure, stacked in the corner of the pool. If you need fast fertilizer, you can use inorganic fertilizers, usually 5 to 10 kg of ammonium per acre or 3.5 to 5 kg of ammonium sulfate, ammonium nitrate, etc. After applying basal fertilizer, it is better to gradually turn shades of water into dark brown or oil green. If the hatching pool also serves as a breeding pond, after the hatching of the fry, it is necessary to gradually apply the water.
3. Fry stocking: The stocking density of fry is 150,000 to 300,000/mu. The fry stocked in each pond should be propagated in the same batch. Before stocking, the nets were repeatedly netted with dense nets to thoroughly remove harmful organisms such as cockroaches, aquatic insects and miscellaneous fish in the pond. It is best to insert a small cage in the pool and put a small amount of fish to test the water, confirming that the pool water is not toxic and then put the fry.
4. Feeding and management: In addition to the natural food organisms cultivated by feeding water, the fry must also be fed manually. It is mainly splashed with soy milk. Every morning and afternoon, it is spilled one or two times. The feeding amount is usually calculated based on the area. Generally, 3 to 4 kg of soybeans per acre per day are used to grind 100 kg of soybean milk. After 1 week, it was increased to 4 to 5 kilograms, and beancake paste was added at the poolside. Soymilk is rubbed on the same day and fed on the same day.
With the growth of fish, in order to increase the dissolved oxygen in the living space of the fish and the pool water, the depth of the fish pond should be gradually increased from 50 to 70 cm to 1 to 1.2 meters. Adhere to the patrol ponds every morning and evening, prevent flooding of ponds and fish, and pay attention to whether the fish fry activities are normal, whether disease occurs, and remove frog eggs and sundries in time.
5. Exercise and separation: When the fry is reared for about half a month and grows to 1.7-2.6 cm, it can be sold or divided. Before the sale or splitting, a net exercise is performed to enhance the fish's constitution and allow it to withstand operation and transportation. The method of exercise is to select the net after 9:00 a.m. on a sunny day. When the net is pulled to the other end of the pond, insert a net cage near the back of the net. Place the near net end of the box into the water, and then put one end of the net. Catching into the cage, the other end is gradually surrounded, and the net is slowly collected. The fish freely swims into the box. After the fish is held in the cage for several hours, it can be put back into the pool. Before exercise, the fish have to stop for 1 day. Care must be taken when handling it, and it is not advisable to carry it when it is rainy or if it is floating.
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