In recent years, with the continuous expansion of freshwater crayfish cultivation and drastic reduction of wild resources, there has been an abnormal shortage of seed. After many years of exploration and research, the author summarized the techniques for raising seedlings of freshwater crayfish cages, which are described below.

1. Pond conditions: The breeding pond should be located near the water source, where drainage and irrigation are convenient and the environment is relatively quiet. The water quality is clean and free from pollution, with a transparency of 30-50 cm. An area of ​​3-5 acres, rectangular, pond 1.5 meters high, with an average depth of 1.2 meters. Anti-escape facilities use a 60-cm wide calcium-plastic plate that surrounds the pool for a week and the bottom is buried about 15 cm below the soil.

2, cage structure and settings: cage using 20-40 mesh fabric (or sieve) made of net cage length of 10 meters, 3-5 meters wide, around the inside edge of the cage seam 15 cm wide Calcium-plastic board to prevent broodstock from escaping. The bottom of the tank is 10 to 15 centimeters from the bottom of the tank, and the cage is set near the inlet of the pond to ensure that the water in the tank is fully exchanged. A bamboo scaffolding is placed directly above the cage and covered with a black shade net.

3. Aquatic grass transplant: The water peanuts are transplanted around the pond, and Elodea and Hydrilla verticillata are planted in the middle. The area of ​​aquatic plants accounts for 50-60% of the total water surface of the pond. The area of ​​aquatic plants in cages accounts for 70-80% of the entire cage area.

4, broodstock selection and stocking: choose more than 10 months of age, weight about 30 grams, bright and shiny body color, smooth body surface without attachments, normal body shape, physical fitness, disease-free without injury, the appendage is complete, hard shell Vibrant individuals act as broodstock. The ratio of male to female is 2-3:1. The broodstock is stocked from August 20 to September 20 every year. The broodstock is bathed with 3% saline for 2-3 minutes before stocking to kill parasites and pathogens.

5, feed feeding: animal feed more fresh fish, snail meat, vegetal fodder, cooked corn, wheat and so on. After the broodstock is in the box, it is fortified and cultivated. The daily feeding amount accounts for 5-8% of the body weight of the broodstock, including 40-50% of the animal feed, and 50-60% of the vegetal feed to ensure the development of gonads. Nutrition. The number of feedings is flexible according to the weather conditions. When the weather is fine, it is fed twice a day. In rainy weather, it is fed once a day or not. Normally, when the water temperature is about 20°C, it is fed once a day. When the water temperature is about 28°C, it is fed twice a day. The amount of feed in the morning accounts for 30% of the total feeding amount of the whole day. The amount of feeding in the afternoon accounts for the total feeding of the whole day. 70% of the amount.

6. Routine management: Clean up residual slag in the box once every 3-5 days, and check if the cage is damaged. Repair immediately if it is damaged. From 9:00 am to 5:00 am the next day, flush the water with the pump, to promote the exchange of water inside and outside the box, to play a role in increasing oxygen and stimulating embryonic development. After the broodstock rowing was basically completed, the broodstock was removed in time, cages were removed, and shrimps were transferred to the pond for larval rearing.

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