In winter and spring, the river surface stocking crabs have the advantages of water fluency, large wind surface, sufficient dissolved oxygen and abundant natural food, which can significantly reduce the breeding cost and increase the breeding efficiency. Now combining our experience in breeding in recent years, we will introduce the following technical points:
1. Prepare for stocking. Choose waters with fresh water, plenty of sunshine, abundant aquatic plants and more snails. Where there are not many plants, artificial cultivation or collection of some plants can be used to make up for it. In this way, the crabs can obtain sufficient animal and plant foods. It helps to satisfy and promote the normal growth of crabs. At the same time, nets and wooden stakes are used to enclose double layers of aquaculture water, which is higher than the normal water level by more than 1 meter. Before juvenile crabs are stocked, wild fish in the waters must be removed to reduce natural enemies.
2. Seedlings are good at choosing aquaculture benefits. Seedlings are very important. First of all, we must select the young crabs that are of neat specifications, robust in health, and disease-free. Judging from many years of farming experience, ecological soil nursery is better than planting concrete pool seedlings. The former breeders are more able to adapt to natural stocking.
3. Restocking time Water surface stocking should be based on winter or spring. The annual December and March 3 to April are the best stocking seasons. When cold and freezing, it is generally not suitable for stocking to avoid frostbite. Survival rate.
4. The amount of scientifically released crabs should be based on natural foods in the waters and their economic strength. 200 to 300 birds per kilogram were stocked at a density of 400 to 600 eggs per 667 square meters. The water area is large, the feed is sufficient, the water quality is good, and the capital can also be increased. When stocking, the crab species should be evenly distributed and the range should be larger. For long-term dehydration of purchased crab species, they should be soaked in water for 1 to 2 minutes together with net bags, and then removed for 3 to 5 minutes. This is repeated 2 or 3 times until the young crabs are fully absorbent and adapted to the environment. .
5. Feeding and managing large areas of water plants are abundant, generally do not need to feed feed in the early period, 6 to 9 months is the season for the vigorous growth of crabs, in order to continue and protect aquatic plants, feed snails, river clams, fish and shrimp meat and grains in time. , beans, pumpkins, etc. Normally, it should be fed twice a day. At 8 to 9 o'clock in the morning and at 5 to 6 o'clock in the afternoon, the daily feeding amount should be 5% to 7% of the crab body weight. The morning should be fed in shallow water areas of aquatic plants. In the meantime, the aquatic plants that have been bitten by the river crab should be removed in time to avoid rot and damage the water quality. It is also necessary to regularly combine quicklime with mixed feed and internal medicine to minimize the occurrence of pests and diseases. Oral medications commonly used are norfloxacin, pro-heparin, and vitamin C.
6. Crab-harvesting Crab-farming crabs are different from pond culture and should be harvested on time. Generally choose to catch fish before the natural reproduction of adult crabs in September, usually using cages and ecstasy to set arrest, the effect is quite good.
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