2. Cleaning and disinfection of ponds can effectively kill enemy organisms (catfish, loach, snakehead, snake, mouse, etc.). ), wild miscellaneous fish (carp, crucian carp, etc. ) and pathogens in the pond. You can use quicklime and bleaching powder, which is economical and safe. The specific operation method is:
(1) lime disinfection. Dry disinfection: 70kg of quicklime is used per mu, and water is splashed all over the pool. If possible, I will hold it with a rake. After hanging in the pond for a week, fresh water will be injected. Disinfection with water: each mu of water surface is calculated according to the water depth 1m, and after being dissolved in water with quicklime 130kg, it is evenly sprinkled all over the pool.
(2) bleaching powder disinfection. After the bleaching powder containing 30% available chlorine is completely dissolved, it is sprayed evenly in the whole pool, and the dosage is 25 kg per mu.
3. Aquatic plants play an important role in lobster culture. First, aquatic plants can make up for the shortage of lobster bait and supplement a lot of vitamins; Secondly, it can prevent wind and waves, absorb some harmful substances in water, purify water quality and balance water environment; Third, it can provide hidden and roosting places for young shrimp and shrimp shells, and reduce bullying by the strong. Generally, the planting area of aquatic plants accounts for half of the whole pond area. Variety selection: dwarf reed, POTAMOGETON crispus, Sophora alopecuroides, Ceratophyllum, wild grass, Zizania latifolia, yellow grass, POTAMOGETON malayi, Elodea, etc. If possible, you can also put some empty cans, bamboo tubes, tree roots and other wastes at the bottom of the water body, which are the favorite habitats of crayfish.
4. When lobsters are stocked in shrimp ponds, proper amount of organic fertilizer is applied to cultivate bait organisms, which can directly provide natural bait for shrimps after entering the ponds. Choose 400 kg/mu fermented organic fertilizer to maintain the corresponding fertility of the pool water. In the process of feeding, with the gradual deepening of the water level, it is necessary to topdressing the decomposed organic fertilizer. The choice of quantity and time depends on the fat and thinness of the water, generally not exceeding 80 kg at a time. The transparency of the pool water is kept at about 35 cm.
5. The release of lobster fry can be divided into spring release and autumn release. Requirements of neat specifications, complete appendages, no disease, no injury, no foot. Wash with 5% saline water bath for 5- 10 minutes before stocking to kill parasites and pathogenic bacteria. The purchased shrimps should be soaked in the pool water 1 minute when entering Tangqian, lifted and put on hold for 2-3 minutes, and then soaked 1 minute. Repeat this for 2-3 times to make the shrimp body surface and gill cavity absorb enough water before stocking, which can improve the survival rate.
6. Put cultured shrimps in spring: put 5,000-6,000 young shrimps with a body length of 3-5 cm in mid-March; Autumn parent shrimps: 500 artificially selected lobster parent shrimps are put into each mu in September or so, and the male-female ratio is 3∶ 1.
7. Lobster is omnivorous, and animal feed, plant feed and various artificial feeds should be used together at different stages. Animal feed mainly includes small fish pieces, dried fish meal, snail meat and various animal offal; Plant feed mainly includes rapeseed cake, soybean meal, bran, wheat, corn, pumpkin, various vegetables and aquatic plants.
Extended data:
Living habits:
Lobsters are very adaptable. According to the investigation, it can survive in lakes, rivers, ponds, canals and paddy fields, and even in some water bodies where it is difficult for fish to survive. Lobster has a strong adaptability to dissolved oxygen in water. It can not only climb ashore in an anoxic environment, but also lie on its side on the water with the help of floating plants or aquatic plants in the water and breathe through its gills to survive.
Lobsters have a strong tolerance to hypoxia, and can climb ashore for gill breathing and survive in an anoxic environment. The pH value of water is in the range of 5.8 ~ 9, and it can still survive normally when the dissolved oxygen is lower than1.5 mg/L/L. The normal growth requires that the dissolved oxygen be above 3 ml/L.
Lobsters have a strong tendency to flow, like fresh water and flowing water, go upstream and live in groups. In aquaculture ponds, groups often gather around the water inlet. In rainy days, shrimp can stay or escape on the shore for a short time against the current, and climb ashore to live when the water environment is not suitable, so the breeding ground should be fenced to prevent escape.
References:
Baidu encyclopedia-lobster