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I. Pond selection
Fresh water quality is required. There is no living and industrial pollution in the vicinity. The water is drained into the water. The pond dyke is firm and there is a gate for water intake and drainage control. The upper layer of pond sediment is dominated by soft mud, and the middle and lower layers are good for sediment. The salinity of seawater is above 12‰, the pH is between 7.5~8.6, the pond area is 20~30 mu, and the water depth is more than 1 meter.
Second, preparation before stocking
1. Pond finishing. About 1 month before stocking, the pond was drained, turned into the beach and exposed for 2 weeks. At the same time, sludge impurities on the surface of the pond were removed, and the beach was divided into several pieces of pupa for farming.
2. Clear pond. It is mainly to kill pathogens and predator organisms. It can be sprayed with quicklime, bleaching powder, tea pots and other drugs. It can also be used as a physics machine. It can be used to plow the soil by cultivating a ship to kill suffocating creatures and suffocating it. 3 ~~4 times, submergence of paddy field (15cm~20cm), flooding until the efficacy disappears.
Third, seed stocking
Usually in the middle of April, choose sunny weather. The dry seeding method was used to broadcast the seedlings and the burrowing seedlings were evenly spread on the cultivated Putian. Select seedlings with strong fat, good color, individual uniformity, strong vitality, specifications for the 80,000 ~ 100,000 / kg burrowing seedlings, acres of seedlings for the amount of 150,000 to 200,000 / acre.
Fourth, basic bait culture
After entering the water in the clear pond, the food organisms are cultivated depending on the water quality. When the water temperature before the rain is less than 20°C, urea 4 kg/mu, fertilizer and water king 1 kg/mu, and compound fertilizer 2.5 kg/mu can be used for fertilizer and water. After the rain, due to polyculture of shrimp seedlings, cocklepods and shrimps caught in the open sea can be selected for feeding. The feeding amount depends on the feeding conditions of the shrimps. It can also play the role of fertilizer and water, and if the food is insufficient, the inorganic fertilizers are appropriately added. , control the transparency in 30 cm ~ 35 cm. After the summer solstice, as the amount of polyculture shrimp feeding increased, no longer apply urea, fertilizer and other chemical fertilizers, only regularly sprinkle fertilizer king to regulate water quality.
V. Breeding management
1. Water quality management. Pond water quality requires a transparency of 30 cm to 35 cm. The water depth in the pond during the high temperature and cold season is maintained at more than 1 meter. During the growing season, the water quality is changed from time to time depending on the water quality. Generally, the water is changed once a week, the water exchange rate is about one third, and the water exchange volume is increased during the high temperature season. To avoid sunlight exposure, the best time to change the water is to drain the water from 2 to 3 o'clock in the second half of the night, from 8 to 9 o'clock in the morning, or in the evening. Combining water exchange to sort Putian is beneficial to the growth of burrows.
2. Dry dew. During the cultivation process, floating mud will gradually develop in Putian. In order to make surface mud hard, each time the water is drained, the beach surface will be leveled and dried for about 2 hours. When the weather is cold, the drying time can be extended to half a day. .
3. Injury. During the breeding process, pests that are harmful to burrowing should be removed. At any time, fishes, such as canola, water clouds, etc., will be fished out so as not to cause excessive damage to burrows.
4. Tour pond. Before and after the dawn, it is necessary to pay attention to weather changes, prevent natural disasters such as typhoon, flood, severe cold, and extreme heat, and observe whether there is any abnormality in the shellfish, check whether there is any damage to the mesh, and make timely leaks, especially before and after the typhoon. Should pay attention.
Sixth, other matters needing attention
[1. Salinity problem. After testing, burrows grew rapidly at a salinity of 12 , or more, stopped growing at a salinity of 7 ‰-8 ,, and died in large batches below 3 ç› of salinity. Therefore, during the breeding process, we must pay close attention to the weather forecast, such as raising the water level before raining to prevent the salinity from dropping, and changing the water after the rain is fine. Especially during the typhoon season, we must pay special attention.
2. Temperature problems. Temperature is another key factor that affects the growth and survival rate of burrows. After testing and observation, the critical water temperature for burrowing is 32°C. In the hot season, try to increase the water level and create a suitable water temperature environment. Appropriately lowering the water level in the spring and autumn season is conducive to the growth of burrows.
3. Water quality problems. The burrow filter has a large amount of food and fast growth, and it should grow in a high water body fat environment. Through observation, during the growing season, when the burrow shell is more than 1 cm wide, the burrowing grows fastest when the water transparency is controlled at about 25 cm, while the raising oysters and loach should not be too fat. The burrowing should not grow in a water-rich environment when the seedlings are grown until the shell width is less than 1 cm. At this time, the transparency of the water should be controlled at 40 cm to 50 cm. Therefore, in the breeding process, we should pay attention to the grasp of the water body, the transparency of the previous water should be 40 cm to 50 cm as well, until the burrow shell width to 1 cm after the transparency is gradually adjusted to 25 cm to 35 cm.
South Sea water pond burly full artificial breeding technology
Scapharca broughtonii is a large, deep-water economy shellfish. In China's natural sea area is mainly distributed in the northern part of the Yellow Sea. The burly meat is delicious and nutritious. In recent years, the burly artificial breeding has developed rapidly and has become one of the advantageous aquatic products for China’s export earnings. In order to explore the burly technology of seawater ponds in the southern region, Wenling City, Zhejiang Province introduced seedlings from Dandong, Liaoning province in 2005 to conduct full-scale artificial breeding. After a year of experimentation, a number of techniques and experiences were accumulated. The following are introduced: