Cultivation of Red Dragonfly in Taihu Lake

The cultivation of red dragonfly in Taihu Lake is a special kind of food for special aquatic animals such as cockroaches, turtles, and clams. In recent years, with the rapid development of the special aquaculture industry, lanthanum, as an important source of feed protein, is in short supply and has been favored by farmers. Taihu Lake has high yield of red tadpoles, and annual average mu yield can reach 2000-3000 kg. It is called by Charles Darwin as "the world's most useful animal." Taihu Lake Red Dragonfly is named after the Japanese Emperor Ai Shengkai after long-term improvement. Taxonomy belongs to the genus Asteraceae and Aisheng. Individuals are small, generally 50-70 mm long, 3-6 mm in diameter, and 90-150 mm in dilute bodies and 8-12 mm in diameter. The body surface is just fine and dense, body color is red, and there is a deep and light color change with the change of feed, moisture, light and other conditions. It is characterized by "three hi three fears": hi temperature, hi wet, hi air; fear of vibration, fear of touch, and fear of light. The advantages are thick body cavity, fleshy, long life span, strong adaptability, high reproduction rate, and easy feeding. It was determined that the dry body contained fat 7.9%, crude protein 66.3%, carbohydrate 14.2%; per 100 g carcass contained 92 μg carotene, vitamin B, 0.25 mg, vitamin B22.3 Microelements such as milligrams and vitamin D, E, quinone derivate, antipyretic alkali, manganese and iron, the content of iron is 14 times that of fishmeal and can completely replace imported fishmeal.蚯蚓 has a special odor, and is a major food for special aquatic animals such as cockroaches, turtles, cockroaches and so on. It plays a good role in attracting food. It is worth mentioning that fishmeal oysters are heavy, and the specialties such as soft-shelled turtles and other special animals have long-term consumption of fishmeal and have a heavy odor, less flavor, and poor quality. If an appropriate amount of wolfberry is added to the feed, its flesh will become delicious and even have game, and the quality will increase accordingly. The main reason is that Taihu Lake is rich in glutamic acid, accounting for 8.21% of total amino acids. The technical points for the artificial cultivation of Taihu Lake red clams are as follows. 1. Land selection and stocking. Farming sites in Taihu Lake should be selected near water sources, transportation, and management facilities. You can use the empty space behind the house or in the forest. Larger aquaculture areas can be equipped with tap water, submersible pumps or automatic sprinklers. The width of aquaculture beds can be adapted to local conditions, generally 5 meters wide, with an intermediate walkway of 70-80 cm. If the carts are used to transport livestock dung into the culture bed, the width will increase accordingly. The two trampolines on each side of the walkway are about 2 meters wide. The height of the bed is about 20 centimeters, and the length is not limited. Both sides should have good drainage ditch. Fermented livestock manure (preferably cow dung) is applied in a strip shape to each bed, about 25 cm wide, and 15 cm in the airspace. Before the seeds are put into the water, they must be irrigated with water and dribbled 2 kg of buckwheat seeds per square meter of sorghum. After the seeds have been placed, cover the straw or crop stalks on the bed to facilitate moisturizing, heat-preventing and freezing, and preventing enemy damage. . Kinds of feeding time, generally can be placed throughout the year. 2. Feed and management. 1 added material: timely and appropriate amount of plum blossom in the trampoline to make more material, leaving 6-8 cm gap left to facilitate ventilation. During thunderstorms, appropriate measures must be taken to prevent strong vibrations and lightning flashes and strong rainstorms. Generally, the cover should be thickened to ensure its safe growth. 2 Insulation: Cover grassy straw, rice straw or crop straw on the bed, and moisten it regularly. It is advisable to keep the moisture content of the trampoline bed at 30-50%. In summer, the high temperature period is watered once every afternoon, and the cool period of autumn and spring is watered once every 3-5 days, and the low temperature period in winter is watered once every 10 to 20 days. 3 Cold: Taihu Lake can naturally winter, in order to enable winter cold weather to grow and reproduce, it is necessary to take appropriate insulation measures, in the covered trampled curtain, straw or crop straw and other insulation materials on the trampoline bamboo arch cover Film insulation, so that Taihu Lake can not only safely overwintering, but also normal growth and reproduction, in order to improve the yield and aquaculture efficiency. 4 Breeding: At an average temperature of 20°C, sexually mature quail mated 7 days later and spawned. After approximately 19 days hatching, the young can grow for 38 days. The whole growing period is about 60 days. Therefore, it is necessary to add the most favorite foods such as cow dung to promote its appetite, fast growth, spawning and increase the hatching rate and survival rate. 5 Killing: Set up a dense mesh about 1 meter high around the nursery bed, and apply it to the enemies such as ants and other natural enemies that are harmful to earthworms every 10-15 days. 6 Collection: According to the needs of special aquaculture bait such as astragalus, turtle, earthworm, etc., it is necessary to mature a group of batches, keep large and small, maintain a reasonable density, improve breeding base, increase aquaculture efficiency.

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