Crayfish breeding techniques
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Broodstock broodstock rearing tanks generally use earthen ponds, depending on the size of the area may be. The water depth is 0.5 to 1 meters, and the pool width is 1.5 meters or more. Built into the drainage system, around the pool pool with plastic film or calcium plastic board to build escape prevention wall. The broodstock cultivation pond must have sufficient water supply, be clean and free from pollution, and have high dissolved oxygen. In particular, the amount of oxygen dissolved in the water during intensive cultivation is required to be above 4 mg/l. A small ditches were excavated in the pool to facilitate the collection of shrimps. Fifteen days before the broodstock is stocked, the whole pool is disinfected with 150 kg of quicklime per acre, and 500 to 800 kg of decomposed livestock and poultry manure is applied to the water. Then, after filtering (to prevent wild fish from entering the pond), new water is injected, and concealed objects such as branches, tree roots, bamboo tubes, etc. are placed in the pool for the shrimp to inhabit, and some plants are transplanted. The area of ​​the aquatic plants accounts for about the area of ​​the cultivation pond. 1/3.
The broodstock stocking density should be appropriate, usually 9 to 10 months of selected broodstock stocking of 100 to 150 kg per mu, 3 to April selected broodstock stocking of 80 to 100 kg per mu. Bathe the shrimp body with 3% saline for 10 minutes before stocking. During the cultivation, we must strengthen the feeding of feed, feed fresh water grass, bean cake, wheat bran or compound feed, and add a part of animal feed, such as chopped snail meat, livestock and poultry slaughtered leftovers. Daily feeding amount: In March, 2% to 3% of the body weight of the broodstock, 4% to 5% in April, and 6% to 8% in May, each feeding once a day in the morning and evening, feeding in the evening 70%. At the same time, we will strengthen water quality management and add water and drainage depending on the color, transparency and weather conditions. Generally change the water once every 10 to 15 days, each time changing the pool of water 1/3. Every 20 cubic meters of water per cubic meter of water, quicklime 20 to 25 grams of water Quanchiposa 1, in order to maintain good water quality, promote gonad gonad development.
Breeding and hatching From April to May, when the water temperature reaches 18°C ​​or more, broodstock begin to mate. At the time of mating, the males discharge the sperm into the seminal vesicles of females and save them before spawning. The fertilized eggs were hatched as juvenile shrimps on the setae of the female's abdomen's appendage, and the incubation temperature was 22 to 28°C. Water temperature at 18 ~ 20 °C, the incubation period of 30 to 40 days; water temperature at 25 °C only 15 to 20 days. After juvenile hatching, the growth and development of juveniles are completed under maternal protection. When young shrimp leave the mother, they can take food and live independently. When a large number of juvenile shrimps are found in breeding ponds, they should be picked in time.
Shrimp cultivation seedling pool with 20 to 40 square meters, water depth of 0.6 to 0.8 meters of cement pool as well, can also choose an area of ​​1 to 3 acres, 1:2 slope ratio, water depth of 0.5 to 1 meters of earthen ponds, water should be sufficient, The water quality is good, and it is convenient to enter and drain water. The anti-escape facilities are built and the ponds are sterilized (the same method as broodstock breeding). The newly built cement pool should be alkalined and then disinfected. Then 500 kg of cooked manure was applied per mu to cultivate natural food. In addition to setting roots, bamboo tubes, mesh sheets, etc., the pond should also be equipped with a certain number of submerged and floating plants for creeping habitats, oyster shells and concealment. Juvenile shrimp stocking capacity is generally 150 to 230 per square meter, pay attention to the same specifications with the shrimp in the pool, and choose sunny morning or cloudy days.
After the first week of stocking, grated soybean milk can be fed and fed 3 to 4 times a day. Starting from the second week, animal feeds such as small fish and shrimp, snail meat, cockroach and cocoon are mainly fed, and the paste feeds of corn, wheat, fresh plant stems and leaves, etc. are mixed and comminuted to form a paste feed, both early and late. 1 vote, 70% of the daily amount of bait at night. Daily feeding is: 0.25 to 0.40 kilograms per 10,000 juvenile shrimps in the early days, and then fed at about 10% of the shrimp body weight in the pond. The specific amount to be fed depends on the weather, water quality, and the amount of shrimp eaten.
During the cultivation process, change the water every 7 to 10 days 1 time, change the water in the pool by 1/3 each time, and keep the dissolved oxygen in the pool above 5 mg/L. Every 20 days or so, about 20 grams of quicklime water per cubic meter of water is sprayed on the whole pond to regulate water quality and increase the content of free calcium in the water, providing the calcium needed for growth of juvenile shrimp in the oyster shell. The larvae are cultivated for 25-30 days, and the oyster husks are grown 5-8 times. When the larvae reach 3 cm in length, the larvae can be transferred into shrimp ponds for culture.
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