1. There are many breeding modes: (1) summer stocking mode. The first batch of young shrimps hatched in that year were mainly stocked, and the stocking time was in the middle and late July, and the size of young shrimps was above 0.8 cm. Stocking 30,000 to 40,000 tails per mu. (2) Autumn stocking mode. The large-scale shrimp fry or shrimp species cultured in that year are mainly stocked, and the stocking time is from mid-August to September. If the size of shrimp seedlings is about 1.2cm, 25,000 ~ 30,000 shrimps will be stocked per mu; Shrimp species with a size of 2.5 ~ 3 cm are stocked1.50,000 ~ 20,000 per mu. A few can meet the market specifications by the end of the year, and most of them will be caught and listed in June-July of the following year. Commercial shrimp weighs only 25 grams and yields 300-500 kilograms per mu. (3) Winter and spring stocking mode. Generally, the goods are stocked in February or March-April of the following year after 65438+. The shrimp that did not meet the market specifications in that year were mainly stocked, with specifications of 0/00 ~ 200 per kilogram and 0/5000 ~ 20000 per acre. After breeding in winter and spring, it will be listed in June and July. Commercial shrimp can weigh up to 30 grams and yield 400-500 kilograms per mu. ?

2. Seed quality The requirements for shrimp seedling quality are: (1) the specifications are neat. The size of young shrimp is more than 0.8 cm, and the size of shrimp species is about 3 cm. The specifications and varieties of shrimps stocked in the same pond should be consistent, and all of them should be stocked at one time. (2) strong physique, complete appendages, no disease or injury, and strong vitality. (3) artificially cultivating shrimp seedlings and shrimp species. If it is a wild shrimp species, it should be domesticated for a period of time before stocking, so as to avoid fighting and killing each other. ?

3. Precautions: (1) Stocking should be carried out in sunny mornings in winter, and in sunny mornings or rainy days in summer and autumn to avoid sun exposure. (2) Wash shrimp 10 minute with 3% ~ 5% saline water before stocking to kill parasites and pathogenic bacteria. (3) Shrimp species purchased from other places should be treated slightly before stocking because they have not been watered for a long time. Soak shrimp seeds in the pool water for 1 min, lift them for 2-3 minutes, then soak them for 1 min, and repeat this for 2-3 times, so that the surface and gill cavity of shrimp seeds can absorb enough water before stocking, and the survival rate can be improved. (4) In the pond where crayfish are cultured, some silver carp and bighead carp are mixed appropriately to improve the water quality and make full use of the bait resources.