Ecological and healthy breeding technology of Chinese mitten crab

3. Ecological habits: Chinese mitten crabs like to live in slightly alkaline or neutral waters (such as grassy lakes, rivers, etc.) with fresh water, rich dissolved oxygen, lush aquatic plants, and rich food. Its habitats include seclusion and cave dwelling.

4. Lighting: Chinese mitten crabs prefer weak light to strong light, and are diurnal and nocturnal. There are some artificial crab nests in the pool, with a nest depth of 40 to 50 centimeters. Aquatic plants such as Hydrilla verticillata, Eclipta sibirica, Erythora spp., Echinacea, Vallisneria and other aquatic plants are transplanted at the bottom of the pool. The aquatic plant coverage rate reaches 30% to 35% to meet the living habits of Chinese mitten crabs. When using quicklime to clean the pond, the dosage per acre of the dry pond is 75kg. On the one hand, it can kill harmful organisms. On the other hand, it can improve the water quality, increase the content of calcium ions in the water body, and promote the molting growth of Chinese mitten crabs. When using bleaching powder to clean the pond, first calculate the volume of the pond water, and use 20g of bleaching powder per cubic meter of water. Dissolve the bleaching powder required for the nursery pond with water, and then sprinkle it all over the pond immediately. Usually, crab seedlings can be released 5 days after the pond is cleaned. The appropriate area for planting aquatic plants should be about 1/3 of the water surface. 2. The selection quality standard is that whether they are natural crab seedlings or artificial crab seedlings, they should be large in size, 140,000 to 160,000/kg, yellowish-brown, shiny, strong in swimming ability at room temperature, disease-free, able to spread quickly by shaking dry with hands, and the size and specifications must be neat (generally required to be 80% to 90% the same). ① The pond is mainly kept with crabs alone, with some fish. (3) From yellow crabs to adult crabs (the body length increases from 3 cm to more than 4.5 cm, the weight increases to 15 to 100 grams or even more than 150 grams, and they molt 3 to 4 times), 6,000 to 8,000 crab seedlings are released per mu. ②Animal bait such as small fish, shrimp, snail meat, silkworm pupae, pig blood and livestock and poultry offal;
At the same time, appropriate adjustments can be made according to weather, temperature changes and the feeding situation of Chinese mitten crabs. When there is continuous rain and muggy heat, and a large amount of organic matter is decomposed, the water must be changed frequently, or when there is no rain for a long time and the water quality is aging, the water must be changed frequently. (1) Patrol pond duty.